Lucas distributor advance curves. Click for 20-page 159-KB pdf file.

as indicated by the manufacturer. Therefore a TC/TD distributor with number DKY4A -40048 or 40162 had an advance plate marked 15 ( 14 to 16 degrees ) giving an automatic advance of 28 to 32 degrees on the Jun 18, 2015 · Hello, I have a table showing the different Lucas distributor part numbers applicable to Rover V8 variants, one of the columns has alphanumerics for the advance curve e. counter, as a 123\GB-4-R-V does not offer this. p. However, in these discussion I have not noticed examples of why a particular spring was chosen as it relates to the rate (speed) of the advance curve. Based on either the Lucas 25D style or the Lucas 45D style, these can all be made to order within 3 - 4 weeks. Just using a (shielded) USB cable and notebook. Jan 26, 2012 · XJ6 distributor: Does any one know the mechanical advance curves for this distributor? # 45DM6 41912A …California car. In my disti (DMBZ6A from a '62 Mk2 3. Both units 54410415 and the later replacement 54412348 are the same code. Last edit at 2024-01-04 04:14 PM by Steve S. TC10178 – saved from sitting on bricks since 1967 in a Sheffield lock up garage (Part 4) Distributors used by Lotus on the twin-cam engine are shown in the table below. It appeared in larger saloons and sports cars of the 1960s and early 1970s. Order your Triumph TR5-250 Distributor - Lucas Type 22D6 - 6 Cylinder ⛽ Low prices and fast, worldwide delivery British car experts ♚ Call ☎ 01522 568000 or ☎ 1-855-746-2767 This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. " 23D4 ref 40953 introduced 18/Sept '63 Ignition advance (Distributor degrees) 11-13 degrees. This is to make up for when the vacuum goes away under acceleration. Oct 22, 2004 · plotted to optimize this engine. Advance Distributor may well be in my future. The vacuum advance version also has a custom tailored advance curve to suit most applications. This article is primarily about the Lucas Distributor Advance curves and other stats and now Delco Remy Distributors as well : This list is the result of many hours of searching for proper settings during some of my past experimentation and troubleshooting efforts. Need vehicle > applications & specs on advance curves. Please check if the distributor need a connection for a mechanical rev. The CSI ignition for the MGC has 16 different improved curves for this six cylinder engine to select the best advance curve for your own engine. g. The Aug 2, 2006 · MSD describes the process, "The function of the advance curve is to match the ignition timing to the burning rate of the fuel and the speed (rpm) of the engine. Jan 4, 2024 · He can also reconfigure your ignition advance curve so that it will be appropriate for today's modern fuel. Choose the link for whichever distributor you need to look at: For the replacement of most 4 cyl. The 23D4 is what the early/mid 1960's mini Powerspark Lucas 43D Distributor Non Vac Top Entry The Lucas 43D distributor is a non vacuum version of the popular Lucas 45D distributor. Edited 1 time(s). The 123\JAG-6-R-V replaces most 6 cyl. I don't know if John is doing distributors right now. We suspect the Lucas 41225A distributor is not providing enough advance among other issues. Advanced Distributors, LLC 17495 Marystown Road Shakopee, MN 55379 (612)-804-5543 This spec was based on a batch of unused 41189D distributors that they had inherited and subsequently analysed, and also backed up by a wad of Lucas distributor data from the '70s that I sent them (they had not seen this data before). Not sure if that is according to spec or if someone was trying to replace a broken spring. Highlighting the difference in Advance Curves and where they differ from the manufactures Specification. the distributor came back to me looking as good as or better than new, and has been functioning flawlessly. The Lucas 45D is one of the most widely used distributors on any British classic car, and this non-vac advance May 10, 2019 · Does anyone have distributor curves to share? Looking up specifications for the 3 1/2 Mark V engine gives the shop manual numbers, but I cannot find any curve data. It shows an electronic dashboard. Jul 24, 2016 · Hi, The Mk4 engine I have reconditioned has a Lucas 25D Distributor on it from a Hillman Avenger. I’ve fitted a new distributor from Accuspark but the quality isn’t all that good when compared to the Lucas. Even with Oct 21, 2018 · For spark production, i use a Lumenition system, in a Lucas distributor, with a Lucas gold coil. I like to aim at the notch on the flywheel. Dec 25, 2005 · I have data from another source (Tuning Lucas Ignition Systems, Speedsport Motorbooks) which has advance curve data, but no reference to an ECM curve. For instance 3K RPM should be set 35 degrees BTDC. Rylan shows you how to tune your distributor for maximum performance and power "the old fashioned way". There is a lot of discussion about the meaning of the term ECM as Lucas used in all of their ignition data. 2. My distributor settings as follows: No advance below 400 rpm May 17, 2017 · A typical mechanical-advance curve might start advancing at 1,500 rpm and achieve full advance by 2,600 rpm. I used the kit that fits in the dizzy so the advance curve should remain the same. • The amount of advance is controlled by the advance bushing. DISCLAIMER WE ARE BRITISH VACUUM UNIT OF THE USA AND NOT LUCAS! We rebuild and refurbish and re-manufacture proper ignition parts to replace incorrect or none existing parts calculated to modern pollution standards for antique and older British collector cars which otherwise would be removed from road used in the United States and other country's. Strombergs. Aug 19, 2014 · Don't think it matters. Simple and efficient? Yes it is! But fitted without any vacuum (removed) I encountered a new difficulty. > > Thanks, > > Dave Russell /// unsubscribe/change address requests to (email redacted) or try Service number 123/Mini curve Application; 40767: C: 848 Mini UK Vehicles Regular Fuel: 40768: F: 850 Mini: 40774: 3: 997 Mini Cooper HC: 40819: C: Mini Cooper S Mk III, 1275 cc Oct 31, 2014 · Jeff at AD converted the 6 cylinder distributor to 4 cylinder operation, removed a vacuum retard unit and installed a vacuum advance unit, then set up a custom ignition advance curve for my high compression engine build. 8 liter) the weights can be set to 13 degrees or To add complication, the vacuum advance unit was also designed for specific applications, so if you swap one from an unknown source, it may change the advance curve. Tuning your engine using your own tablet or smartphone? The TUNE+ is the first wireless electronic ignition that you can program yourself using your iOS or Android Bluetooth 4. By watchi This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. I believe that I should be using a Lucas model 41605 or a 41623 but can not find any data for the advance springs and cam or the vacuum Oct 31, 2015 · The distributor is a Lucas 45D - and the Tegler site is listing this distributor with an advance curve, which starts at 10 degrees for 900 RPM, goes own with 13 for 1300, and finishes with 26 % als max This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. The CSI ignition for this 8-cylinder engine has 16 different improved curves and is also available for the later SD1 engine type. Aug 13, 2024 · Hi All Busy rebuilding my DVX6A distributor for my 1955 XK140 SE and I found two different advance springs inside. We set and test the advance curve of each distributor on a Sun distributor testing machine for optimal performance with vehicles using 4-cylinder, vacuum-advance, points-based Lucas 45D distributors. Apr 3, 2017 · Autosport is the only one in town with a distributor machine and parts for the Lucas distributors. The Powerspark 45D6 distributor is a direct replacement for your Lucas 22D6 or 45D6 distributor. Dec 23, 2014 · Distributor Advance Curves/ Re-Manufactured Distributors - posted in Electrical: Information Provided By Chris (Spider) After carrying out tests of aftermarket Lucas Distributors currently available from different suppliers on his Distributor Test Bed. According to the book above, static timing would be 10 degrees BTDC and the advance curve is listed in a table on page 465: Curve 1: I discuss the basics of tuning Lucas distributors. Most versions are available with an option of having a mechanical advance for engines using twin sidedraught carburettors. I don?t know how the different distributors would affect performance. For those interested my MGB is 9:1 compression, 060" overbore, mild road cam, twin HIF's and TT header and exhaust, Lucas 123 ignition curve #1. You have to look at the Lucas part number to determine what the specifications were originally. A completely new Distributor with new cap, rotor, contacts, condenser, bearings/bushes, oil seals and vacuum unit, assembled in the UK with weights and springs set to the original advance curve and the vacuum unit set to the original specification, just as Lucas would have built it and set it up ori May 9, 2023 · Local Mechanic took some bench measurements on my recently rebuilt 25D Lucas distributor. The 41033 Cooper S mk3 distributor was replaced by Rover with a 45D type BAU1850 less a vac unit and lucas 41372 D4) which fitted Canadian 998cc minis and Marina 1. curve which in fact describes the ignition advance from idle to maximum allowed r. It appears I do not have the original distributor in my 1964 3. If that full advance moves the rotor by 25 crankshaft degrees and our initial timing is For the first time of It’s life since the engine was rebuilt this car is able to start at once to climb the ribs without any pop and bang. Can anyone tell me: *what ECM PS2 Let's not forget the Lucas past was also blemished: the (in)famous 41427 being one of those Lucas units having their curves varying all over the place (it was meant to replace the better 40897) In reply to # 4056418 by tvrgeek Yup. There is a distributor cap for the 25D4 that enables you to use push-on leads (Intermotor 44140; the screw-in type: 44720). The effect of changing spring rates and free lengths will be analyzed, design charts and examples will be presented. The factory advance curve is very conservative. According to Miles Wilkins book, the 40953 has a total advance of 24 degrees and the 41189 has a total of 14 degrees and the curves are different. 3 HC The surveys below also mention an E. 95. Visit our "Lucas Distributors" page for distributor re-build information! The Lucas 43D distributor is a non vacuum version of the popular Lucas 45D distributor. all under the same model number. Photo 3: Tuning Centrifugal Ignition Advance Mechanisms The selection of advance springs also affects how the ignition advance curve relates to engine rpm. You can easily setup the 123/TUNE to fulfill even the most demanding requirements. Andrew Edited 1 time(s). land rover 110 Distributor lucas 35DM8 & 35DLM8 / LPG Afstellen op 8 graden voor bdp bij 750 rpm mat stroboscoop lamp. We also recommend you change your plugs to a higher heat range. May 17, 2016 · So, I tend to have a little less advance at the low rpm's and just enough at the high rpm's to prevent pinging/pinking. Ignition voltage is really important, to fire the mixture with high compression and /or high revs. For Service number Model rot'n ECM curve RPM 1 Advance1 ± 1° RPM 2 Advance2 ± 1° RPM 3 Advance3 ± 1° RPM4 Advance4 ± 1° no advance below vacuum code Connection years make models Comments This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. The red dizzy has an 'immediate' advance curve that comes in with a bang and is all over by around 4,000rpm for race use. The weights will not return to a point beyond the end of spring tension. Lumenition is reliable, well engineered, and relies on a light trigger in the dist. If you have a modified engine using Weber carburettors we recommend using the no vacuum type. In real life the Lucas test sheet may be the 7 hg can have a start test range of 6 to 8, full advance @ 14 hg may be 13 to 16 and the degrees may be 7 to 9. Tom, don't you rebuild distributors? I know that John Twist at Univeristy Motors does, as do others Dec 26, 2019 · The last distributor you will ever need is now available for your Mini or Mini Cooper S. The distributor can be used in a wide selection of applications by changing only the springs and the advance stop bushing. " Feb 4, 2021 · Distributor Advance Curves - posted in Problems, Questions and Technical: Hi guys, Ive seen this question and topic a lot on the forum, people search for what distributor curve they actually have. Unless this is an advance problem due to the lack of vacume advance, I want to send this distributor to a shop to get checked out. Appears to have correct angled cap, gear drive, clamp, points & condenser. To setup your mechanical advance you first need to disconnect your vacuum advance line. – Hook up a timing light, cap off the vac advance and rev the engine to 3K RPM. The vacuum strength at which maximum advance is achieved. This distributor requires an ignition module, Lucas AB14. I don't currently have my GT6 Spare Parts Catalogue handy (lent to a friend), but my Vitesse 2L Spare Parts Catalogue does list a Lucas distributor as an alternative to the "normal" Delco equipment. thanks, Fritz. Replacement springs come in different strengths and lengths, and as a practical matter there can even be significant variability in springs that look quite similar. My car configuration is basically stock CP 150bhp, original Lucas injection, fitted with a sport exhaust. CCW 'Lucas'-distributors The 123\GB-4-R-V replaces most 4 cyl. I started with a Spitfire's advance curves, and adjusted them during road testing. British Vacuum Unit, is not affiliated with ZF Friedrichshafen AG, the owner the US trademark for Lucas®. Jan 15, 2024 · The design closely follows the look of original 25D4 Lucas distributors, and there are 16 easily-changed advance curves to get your ignition system's performance just the way you want it. Totally legal in all historic racing. What I looking for is an "advance curve" so that I can get the spec on the RPM and the related advance. Your zero point will be where spring tension ends. Jan 7, 2021 · The graph and some spec information show the curve and some show the range. We totally rebuild, re-curve and recondition the DVX, DK, D2A, DM6, DMBZ6, DM2P4, 22D and 25D Lucas 45D6 Type Distributor. Within the settings there is also an immobilizer integrated to secure your car with a state-of-the-art anti-theft system Dec 6, 2016 · The faster the motor spins the more it will advance the timing. Mine doesn’t “click”. The bigger the bushing, the smaller the amount of advance. This is a great feature to easily fine-tune your engine! Dec 28, 2017 · Well, I am kind of dissatisfied with the current performance, but then again I haven't measured the actual distributor yet. I guess what will matter is if your distributor is worn, or if you care to take advantage of the additional possible advance and/or change your existing advance Mar 22, 2017 · Hi everyone, Engine is still at the machine shop and I’m making my way through various engine-related items. And apparently replacement Lucas advance springs have been the Holy Grail of LBCdom -- no one has really found a good replacement yet. The unit offers a maximum total of 16 advance-curves to be selected by the end-user. "F" or "7" Feb 14, 2017 · Hi Guys, Im planning to fit my TR6 PI with the 123 ignition distributor (number 8898 without vacuum port). V12. Jul 7, 2013 · Page 1 of 2 - 998 V 1275 Ignition Advance Curves - posted in Problems, Questions and Technical: There are a few members on here having issues with electronic ignition kits (myself included) and it has set me wondering. A completely new Distributor with new cap, rotor, contacts, condenser, bushes and oil seals, assembled in the UK with weights and springs set to the original advance curve, just as Lucas would have built it and set it up originally. Learning what others have could be informative. If there is a better advance curve than my old, stock Lucas that would run better with this engine I would like to send that curve to the shop. Aug 1, 2021 · The advance curves of the Lucas distributors are far from optimal - they just reflect what was possible at the time. M. Subject: Re: [LotusElan. The Lucas distributor 35D8 was used. And the best thing with this ignition system is that I can set up a special curve corresponding to my way of driving the car and to my wheel of behaviour I want from this engine now it’s a very great pleasure to start up the engine and just hearing it Service number Model rot'n ECM curve RPM 1 Advance1 ± 1° RPM 2 Advance2 ± 1° RPM 3 Advance3 ± 1° RPM4 Advance4 ± 1° no advance below vacuum code Connection years make models Comments This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. The Lucas 45D is one of the most widely used distributors on any British classic car, and this non-vac advance version is often used in classic racing cars. No more guesswork when buying that ebay distributor, just ask for the serial n° and look it up Oct 24, 2023 · Hi Folks, I need to advance my timing slightly with the Lucas 22D distributor. The free app enables you to adjust the advance curve. I looked at the normal 123 as well, but decided that it was unlikely that any of the 16 curves provided would be perfect for my engine. The manual mentions turning the dial a number of clicks. ) This distributor has more advance curve similar to the 41033 (Mk3 "S") which was better for acceleration and economy. CENTRIFUGAL ADVANCE CURVE SELECTING THE ADVANCE SPRINGS The rate, or how quick the advance comes in is determined by the type of springs which are installed on the distributor. Now, the ignition may have to be retarded a little to avoid knock or pinking but otherwise the standard mechanical advance curve should still be OK. lucas_distributor_specs. Or maybe my eyesight is suffering from being nearly as old as the Lucas DM2 distributor. The weights and the different types that are Jan 7, 2005 · Your advance curve is now wrong. I have dug through what literature I could find and it seems that 10 We've taken all the features that you like about the Bosch 009 VW distributor, and the performance capabilities of the 010 and 050 distributor and designed them into our Flame-Thrower mechanical advance distributor. – fbing Mar 6, 2017 · Sent my original Lucas 22D - 41202B distributor to Rob for re-curving, he uprated my vacuum advance to an early 5 13 10 spec among other improvements. The 123/GB-6-R-V distributor replaces most 6 cylinder Lucas-distributors The unit offers 16 different advance-curves, which can be selected by means of a small switch. Does any body have the factory advance curves for the Delco D204 (European Car) distributor that should be on the engine so I can compare them with the 25D to see how close they are. Out of the box these distributors come with the biggest, strongest, most gawd awful springs anyone has ever seen on a distributor that for performance purposes, need to come off immediately. Collectively they are probably more useful than almost anything else where a 'guess' is concerned. Note that there are dedicated 123-ignitions for Mini, Jaguar & MG. Programming your ideal advance curve? The 123/TUNE ignition enables you to do so. Attachments Burton Power Lucas Style 45D4. – Set a curve point for 8 degrees @ 1K RPM, a point for 27 degrees @ 3000 rpm and a point for 27 degrees at 5K. Given that modern petrol is different, I would imagine neither distributor is ideal, even if it is unworn. (The Lucas part number is a 5 digit number, usually with one letter after it, like 40698B. In my research of the archives and the JCNA article in the Jag-Lovers site I have come up with the following table of usage and mechanical advance curve. This is the long list of all known original Lucas distributors (and specifications). By setting the Static Timing at 10 degrees, you preclude having the advance less than 10 degrees at any point in the curve. In the healey manual it states the advance is 35 deg. pdf . C. So if the curve has a maximum advance from 30 degrees at a static setting of 10 degrees and you change the Jun 20, 2023 · EDIT: BJ8 advance Curve 1 and 2 are published curves for the original Lucas distributor. > Anyone out there with old Lucas catalogs? The Lucas part numbers are > #421943 vacuum advance, & #40495A distributor. Our performance distributors feature a modified advance curve and uprated points to suit a tuned engine, particularly with a performance camshaft fitted. Any factor that changes the burning Based on either the Lucas 25D style or the Lucas 45D style, these can all be made to order within 3 - 4 weeks. Jan 3, 2022 · A word about ignition advance curves An ignition advance curve is designed to light a fuel-air charge and place the peak cylinder pressure at around 18Ú ATDC. Registered Office: 1 Bovey Cottages, Waterrow, Somerset, TA4 2BA. at 6400rpm , as the red line is around the 5500rpm I am very reluctant to rev the engine to 6400 . Fitted to Standard Weber, Elan, Lotus Cortina. The surveys below also mention an E. '66 OTS. May 26, 2021 · Originally, the 41427 timing curve was similar to the 40897 (early chrome bumper MGBs. I go over the basics of springs, both primary and secondary. Lucas Distributor Advance curves and other stats and now Delco Remy Distributors as well : This list is the result of many hours of searching for proper settings during some of my past experimentation and troubleshooting efforts. Figure 2 Advance Curves. If you already have SU carburetors with ported vacuum simply have us re-built and re-curve your distributor to a early advance spec. Performance brands like MSD distributors come with kits that contain several sets of springs and bushings to tailor your advance curve. Click for 20-page 159-KB pdf file. Sep 3, 2013 · Lucas made a huge variety of distributors, with different advance curves, maximum advance, etc. My car idles more smoothly if I can keep the idle speed below where the advance kicks in, but that curve looks like the advance starts below 500 RPM. Just as an example, compare the pre-H. Jan 1, 2016 · Modifying the Metro Lucas 59 D4 distributor advance curve to suit the TA engine David Heath lays out how he modified the distributor to arrive at an advance curve to suit his car. “Intermediate” control (not sure what that means Powerspark Lucas 59D Points Distributor with 998cc Specific Advance Curve (D10P-98) Powerspark Lucas 59D Points Distributor with 1275cc Specific Advance Curve (D10P-75) We offer this The Lucas 59D Electronic Distributor with Vacuum Advance in the following combinations: Dec 5, 2021 · John, Static Timing is a concept (in my opinion) that has no place in the world of electronic ignition systems. The Rover engine advance curve needs a 24 degree range of advance: from 6 degrees at 600rpm and 8 to 12 degrees at 1000RPM to 30-34 degrees at 4000RPM and over, according to the needs of the camshaft, compression ratio etc. Aug 4, 2006 · I went back and checked in my Service Manual and, sure enough, on page P. See graph on web site from Peter Baldwins rolling road. , and a remote amplifier. This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. The maximum advance will also go up or down by the same degree the static timing is adjusted either way. Complete rebuild / restore 22D6 XKE 6 cylinder $199. I think it's potentially the larger leak source when it sticks open, and it's a combustible mixture getting past the butterfly. advance, or you want a lower maximum advance, you can also adjust the static setting from 10 degrees to a higher or lower number. m. If this is the case, can the Aug 10, 2018 · In the past, member have had excellent discussions about ignition timing as it relates to distributor advance and the various springs that speed up or retard the distributor advance curve. This might be of interest too : "In the DK4A distributor, fitted with heavy “leaden” weights, the springs were relatively heavy items, provided as a matched pair, and which gave a more or less “straight line” progression from full retard to full advance as the speed of the engine increased, and until the total advance was checked by the stops in the action plate. The vacuum strength at which it starts to move the timing. (I don't have the exact model # on it handy) The dizzy is mated to a 32/36 weber, otherwise the car is bone stock. The Temp Compensator just allows air past the air valve (piston Doug is correct, at least according to my Lucas catalogue (in which I have found numerous mistakes, but I think this is ok). I'm looking for the stock advance curve specs of this unit so I can check it on the Aug 10, 2014 · Inside the distributor, there is a large advance curve. distributors that were used in 3,4 litre, 3,8 litre and 4,2 litre “XK”-engines. On accusparks website, they Oct 23, 2017 · Distributor Advance Springs Change - posted in Problems, Questions and Technical: HI all, I have been running a 998 lucas 59d distributor on my 1275 for a while now and its always bugged me knowing the advance will be wrong. the 40897 and 40916 for the 18G, GA, GB etc engines (4 degrees centrifugal @ 600 rpm plus 10 degrees The early cars had an OPUS ignition system, which was replaced with a Constant Energy Ignition (CEI) system in 1982; both of these systems used a Lucas distributor and both have the same history of centrifugal advance seizure, but the distributors are slightly different. Jul 4, 2011 · I have a '74 TR6 that I am trying to set the timing on. Many thanks Chris the spring, the slower the advance curve. Subject: [LotusElan. 8 OTS. 0 devices. E. Vacuum advance units are defined by three statistics: 1. See more complete description below. The "G" model will replace most Lucas LUCAS DISTRIBUTOR SPECIFICATIONS - IG-126. The advance curve is specific to 6 cylinder Sep 27, 2013 · I just fitted a 123-tune distributor to my Herald. I have a 59D with a power spark / accuspark plate in it abut id like to change the advance springs. Lucas-distributors for engines in Great-British (hence 'GB') cars, where the distributor shaft is turning in a CCW direction. 23D4 ref 41189A introduced 6/March '67 Ignition advance as before 6-8 degrees. And most importantly this is true if you have an 850 or a full blown 1275cc engine. May 11, 2018 · Oh, yes, here’s something… The original Lucas 25D distributor. Ready to install. On all of the older styles we offer a full reconditioning service along with a large stock of original old stock Lucas distributors. PLEASE correct me if I am wrong. Re-building, re-conditioning and re-curving are all catered for either to “Clinically Accurate” original factory specifications, or modified to suit developed engines. we've tried several advance curves and done a lot of testing!) The black & white car now has a 6 cylinder version of the no vacuum advance Lucas 23D4 - a 23D6 - a Lucas mechanical advance only distributor. Feb 20, 2016 · I am going through my distributor and want to know about the proper springs and advance curve. Not sure what advance curve they comes with? There are two Lucas distributors: 25D or 45D. On my Alfa I gave up and went with a 123 Distributor, but here I think I should be able to make the Lucas 25D work (version 40795A). Aldon performance distributors are based on new Lucas or Bosch units and have been dyno developed to provide the correct ignition advance curve to suit different states of engine tune. What it says is that “control begins” (which I take to mean that centrifugal advance starts) at between 150 and 700 distributor rpm, depending on the model. This high quality reproduction has been selling for over 15 years. Trying my best, I have not included anything here I could not verify from at least two different sources This The yellow dizzy has a reasonably gently advancing ignition curve to cope with almost anything road orientated. An engine will be easier to start if the advance is zero, or even a little ATDC, at cranking speed. Taking the unit apart revealed that someone had removed the pri Feb 7, 2011 · I am rebuilding an Excel 912 for my S1 Esprit, and the distributor that came with it is a Lucas 43DM4. Sep 7, 2013 · My later 105 series 1750 is all original spec, but the Bosch distributor is in good condition, and it runs really well without the 123. The Lucas 25D6 Distributor is a vacuum advance distributor used in 6 cylinder vehicles from prestigious British brands including Aston Martin, Jaguar, Triumph, Marcos, MG and Rover. And how much less aggressive the centrifugal advance curve is depends on the engine design (mainly the compression ratio), which is why there are so many different ones out there. As you know, it has 16 pre-memorized curves selectable by a rotary switch. Does anyone know the specifications for those springs or where to get replacements? According to the parts manual it should be part number 421721. Dec 23, 2015 · With all the smog control parts removed from my car by the previous owner, I decided to program my 123tune distributor to emulate the advance of the European market cars that used the Lucas 45D4 distributor. Any direction to source material Lucas-distributors for engines in Great-British (hence ‘GB’) cars. Provides a modified ignition advance curve Jun 2, 2019 · Having been extensively tested today, by cruising at 50 to 55mph, it has done the job, preventing me from having to disturb the work of Martin Jay (The Distributor Doctor), who had set-up the advance curve, as specified by John Saunders because by doing this mod to the lower spindle, I did not have to dismantle any more, than just removing the Feb 10, 2016 · I've got a couple of old 40897 distributors and the curves are all different (probably due to aging springs and previous attempts to rebuild them). Lucas distributors - Re-built, restored and re-curved. He returned my dizzy into an absolute masterpiece, his craftsmanship is so stunning I considered putting it in a glass case on the mantel to admire instead of installing it back in my engine. As this distributor did not offer vacuum-advance, the manifold-pressure curve shows a straight line at zero degrees. Have looked in Haynes and Jag XJ6 CD service manual and have found nothing. Of these there are standard and sport versions - the advance curves differ. 5 there is a table giving spark advance data for several different distributors- all for the 120 of course. The 25D is better made, although apparently it can suffer from points bounce more than the later one. Gone are the points and condenser and mechanical advance mechanism, all replaced with a high quality electronic ignition system. Powerspark Lucas 45D6 Distributor Top Entry The Powerspark 45D6 distributor is a direct replacement for your Lucas 22D6 or 45D6 distributor. Disclaimer: The numbers and concepts explained in this Oct 5, 2002 · > I need help identifying a Lucas distributor & vacuum advance unit. The '123 Distributor' from the Netherlands is a revolutionary design that allows you to have the exact ignition curve that you need for your application. After researching this, I believe a spring steel piece is missing from the distributor. Mar 28, 2022 · In reply to # 4485291 by Crispin You’ve probably heard of the legendary 40897 and then looked at the advance curve in the BL manual and thought what the heck! The BL data for high compression (HC) engine data, the advance is all in by 2200rpm The TDC table of Lucas data has it all in by 3000rpm. My distributor machine is being repaired and all my parts are in storage. All domestic (UK) Strombergs on Elan, +2, Europa. What is not covered Centrifugal advance is obtained by turning the upper part of the distributor shaft, carrying the points cam, anti-clockwise relative to the position of the crankshaft to open the points sooner and hence advance the timing. After some further investigation I've found that the main chip inside this Lucas ignition module is a GM Delco part, easy for me to get as I am in California. net] Lucas Distributor advance curve specs needed Hello all; I'm trying to eliminate a dieseling problem on my 69 S4 Federal Elan w. CENTRIFUGAL ADVANCE CURVE The centrifugal advance mechanism is made up of weights, springs, an advance cam and the advance stop bushing. In compiling the data it appears that ECM curves are standard ignition advance curves and it's very likely that there was some publication that listed the data. There will be some confusion when refering to the direction of rotation of the distributor. at 700 RPM with Vacuum disconnected…does not say what static is setting is. Phil, Don't forget the Throttle Bypass Valves too (CDSE and CD-2SE). . It knocks when going uphill in 3rd, and everything in this engine and transmission has been checked and overhauled with the exception of the centrifugal advance curve, which is next: Reconditioned Lucas distributors, rebuilt Lucas distributors, recurved Lucas distributors Distributor Doctor Ltd. The advance curve on the Chinese replacement distributors is a crap shoot. So if you want to tune your engine or have an engine that does not have a standard distributor available the 123/TUNE can help you out. Only problem was I didn’t pay close attention to the centrifugal weights that provide the mechanical advance. In the most general terms - my interpretation of the data indicates: This document will look at tuning the advance curve of Lucas distributors, 23D/25D and 43D/45D types in particular, but the principles and approaches used apply to any distributor with mechanical advance. The distributor that I have is a type 22D6, Lucas p/n 41558 which is not covered in any of my shop manuals. Sep 1, 2003 · Advance Curve: All the factors that make up the ignition timing for a particular application-initial, mechanical, vacuum, total timing, the advance rate, and so on, work together to make up the Oct 31, 2005 · advance drops away, leaving the centrifugal providing a much less aggressive advance curve. :-(There are people who do good rebuilds and wind their own springs, though. Company No: 7904442 Dec 15, 2003 · Subject: [E-Type] Series 1 Lucas distributor. This week’s project was the distributor. Trying my best, I have not included anything here I could not verify from at least two different sources This The distributor runs at half engine speed, therefore the distributor advance number has to be doubled to get crankshaft advance measured at the flywheel or front pulley. In the days of hand cranked engines, you retarded the ignition manually to ATDC for starting, or ran the risk of a broken wrist! The MGC with the 2600 cc six-cylinder engine, was made as a two-door sportscar and as a three-door MGC GT (1967-1969) During this years the Lucas Distributor 25D6 was used. The Lucas Distributors 25D4 or the 45D4 were used and also with different advance curves. Load that curve into the 123 distributor. There is no need to change the weights or advance cam. The MGB GT V8 with the 3528cc 8-cylinder engine was made as a three-door MGB GT (1973-1976). The advance curve is specific to 6 cylinder vehicles. All Lucas distributors will be set the original advance curve with the correct vacuum settings. The unit offers 16 different advance-curves, that can be selected via a little switch. I took it apart and thoroughly cleaned it. Manual says timing set at 17 Deg. This is a mechanical requirement of all internal combustion engines, but the time it takes an engine to develop that pressure is a function of engine design and operating conditions. The distributor is a dynamic system. Distributor Doctor offers “Reconstructive Surgery” for worn and inaccurate Lucas distributors. First things first, identify if its a real Lucas or not - look at the hardware. to the H. Problems come with wear in the advance mechanism, with the earlier type of Lucas distributor being far more susceptible. ) Unfortunately, many companies have put that number on distributors that are neither Lucas or the proper timing curve. CSI-Optimized Distributors offer a fully electronic ignition system built into the correct type of Lucas distributor housing to suit your car, keeping the original appearance in the engine bay. I plotted them on the third CSI graph (showing curves 9 through 12) for reference. It is a compromise invented for the era when timing was controlled by a mechanical system with two springs whirling around the base of a distributor. The CSI ignition for the MGA/B has 16 different improved curves for all those four-cylinder engines types. For instance, the distributor weights will be stamped "17, 18, or 19" for 72 to 74, representing 34, 36, and 38 degrees of (crank degree) advance. The lower part of the shaft has a pair weights restrained by springs. Rather than loosening the distributor to turn it, I thought I would try the vernier adjustment for the first time. By using a more aggressive advance curve you can greatly improve your engines performance. I did find the adjustment screw a real pain becuase the letters on it to show you what curve you have are so small. Apr 27, 2016 · I have fitted an electronic distributor brand 123, with vacuum advance, I have tried to find the Lucas advance curve for the 25d6 original distributor with no luck so far. Dec 6, 2009 · A Compilation of Lucas and Delco Remy distributor specifications as used on the MG and Triumph automobiles, listing advance curves and vacuum curves where available. In theory the centrifugal figures show only the additional advance at the given rpm, whereas the strobe figure is the sum of the static and the centrifugal advance at the given rpm, and this can be seen to be true with some distributors e. Apr 11, 2012 · I'm rebuilding the Lotus 907 engine for my '77 S1 Esprit, have a very small collection of Lucas 25D distributors and would like build up one with appropriate centrifical and vacuum advance characteristics. But Accuspark and powerspark do replacement dizzys fairly cheap. The 'tune version allows you to program your own advance curves. Dec 6, 2023 · At a recent tuning session, this distributor was determined to be giving bad ignition timing. I have this handy chart online that lists a LOT of lucas distributors with their corresponding curve. So the idea is to tidy up the old Lucas, replace the points with an electric ignition kit and refit it… at some point. net] Lucas Distributor advance curve specs needed (Snip). Max mechanical advance + plus static would be helpful. bajhzl jvia emsb nhpt oovbg qtjemq ulifov omvdhq quogoh xsk