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Mopar Performance race distributor mechanical advance #1521041 10/21/13 06:10 PM 10/21/13 06:10 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Hi, I have installed a old MP race ditributor part 4120942, think its from the early seventies. It have tach drive. It seems to be looked, its have no mechanical advance. I have a new MP billet race distributor on my other car and that one you could adjust the mechanical advance with changing the slots (bigger or smaller) and lock it with a screw. Havent disassembled the old race distributor yet but do anyone know how to adjust the mechanical advance, is it the same as the new billet race distributors (mopar performance)? Just change the size of the slots. I think its a kit for the right size, advance curve kit... Thanks folks, 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521042 10/21/13 06:20 PM 10/21/13 06:20 PM
Joined: Jan 2003 Posts: 74,974 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,974 U.S.S.A.	I don't know how to lock it , maybe be as easy as tightening a screw that I believe is under the rotor , but those old mopar race units are not adjustable like the current MP electronics distributor ... I'll refer to Rapid Robert on how to adjust the mechanical advance on the old units , involves welding and filing , I'm sure he has his procedure on a clipboard on his computer for a quickie copy and paste because it posts it up a few times per week ...

Re: Mopar Performance race distributor mechanical advance [Re: JohnRR] #1521043 10/22/13 02:35 AM 10/22/13 02:35 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	The new MP billet race dist have the same advance curve system as the mallory unit. Same way to adjust the mechanical advance. Okay, I will search here again to see if Rapid Robert have post some about change the advance in the old race distributors. The engine is dynoed with another dist. The egine want initial 15 degrees and total of 33 degrees. With this old MP dist I could choose of 15 or 33 Was surprised it even started with 33 initial. Must be the street compression... The old dist dont advance the ignition... Want initial 15 and advanced to total 33 Please help, the mechanical tach and the old gear drive distributor really does it!! 7896164-bild2.JPG (450 downloads) 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521044 10/22/13 03:23 AM 10/22/13 03:23 AM
Joined: Aug 2003 Posts: 43,123 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,123 Bend,OR USA	Quote: Hi, I have installed a old MP race ditributor part 4120942, think its from the early seventies. It have tach drive. It seems to be looked, its have no mechanical advance. I have a new MP billet race distributor on my other car and that one you could adjust the mechanical advance with changing the slots (bigger or smaller) and lock it with a screw. Havent disassembled the old race distributor yet but do anyone know how to adjust the mechanical advance, is it the same as the new billet race distributors (mopar performance)? Just change the size of the slots. I think its a kit for the right size, advance curve kit... Thanks folks, If it is one of the early tach. drive mopar distributors, iron case, not aluminum, it may have had the advance weights welded to make the distributor have no advance so they could use it on a crank trigger ignition. I have two of those now, they do not have the top plate in them with the pickup or reluctor wheel on the top shaft , you can see where they are welded up Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Mopar Performance race distributor mechanical advance [Re: Cab_Burge] #1521045 10/22/13 04:17 AM 10/22/13 04:17 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Its the aluminum one, part no 4120942. 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521046 10/22/13 03:11 PM 10/22/13 03:11 PM
Joined: Aug 2003 Posts: 43,123 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,123 Bend,OR USA	It may have the same thing done to it, if you hold the bottom distributor shaft and try to twist the rotor and it has no movement either way it is probally locked in (welded advance)to the bottom shaft Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Mopar Performance race distributor mechanical advance [Re: Cab_Burge] #1521047 10/22/13 05:00 PM 10/22/13 05:00 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	I only have one spring for the mechanical advance, the other was missing. It wasent locked or welded. The Slots in the advance plate is modyfied and measure 0.470 inch. I think its about 18 degrees mechanical advance. 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521048 10/22/13 05:05 PM 10/22/13 05:05 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Is it any spring kit for these distributors? 7896729-bilden.JPG (1055 downloads) 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521049 10/22/13 05:48 PM 10/22/13 05:48 PM
Joined: Jul 2009 Posts: 413 Norway (old world) Oyvind Mopar mopar
Oyvind Mopar mopar Joined: Jul 2009 Posts: 413 Norway (old world)	So, if it has a slot, and is not welded, why is it locked then? I really cannot see the problem?

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521050 10/22/13 05:53 PM 10/22/13 05:53 PM
Joined: Aug 2003 Posts: 43,123 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,123 Bend,OR USA	Quote: Is it any spring kit for these distributors? I use the Mr Gasket spring kit for the early GM point type distributors, works great I have not treid using just one spring, others on here swear that is the only way to go for a hot street and strip motor Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Mopar Performance race distributor mechanical advance [Re: Cab_Burge] #1521051 10/22/13 08:24 PM 10/22/13 08:24 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Here's some info. EDIT The mr gasket light spring kit is 925B iirc. The MP kit is P2932675. the crane kit (which is no longer available new) had a plain spring a yellow spring & an orange spring & they recommended to always keep the OE light spring & sub in something instead for the heavy spring with the long loop on one end. 7896906-advancecurves.jpg (729 downloads) Last edited by RapidRobert; 10/22/13 08:54 PM. live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521052 10/23/13 07:08 AM 10/23/13 07:08 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Thanks but what do point x and point y means and singel and double spring. I have one spring installed right now, that gave my full advance directly. Its that a singel spring set up or what do singel spring means... I will look in my msd distributor (which the engine was dynoed with) which parameters I will look at but I think I need full mechanical advance 18 degrees and kick in fully at about 2500 rpm. What springs do I need? Also the slots measured 0.470" have seen a table here that stated 15 degrees x 2 for that slot size, correct? I want 18 degrees advance, should I aim for 0.390" slot size (advance plate). In a mopar muscle magazine article I read 0.370" was 20 degrees in advance plate. Last edited by Snoddas; 10/23/13 07:09 AM. 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521053 10/23/13 10:39 AM 10/23/13 10:39 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Point X is when the advance starts and point Y is when the advance is maxed out. Single/double means (1) spring or (2) springs of the OE light springs that come (1) to a dist. Reportedly the slot length/adv amount chart ain't dead on so file em slightly less than the chart because if you go too far it means another trip to the welder & yes you will have to be in & out of there several times till you get it dead on. I would find the initial your eng wants with the "vac gauge method" then shorten the slots to get 35 (SB) or 36-38(BB) total (both initial and total set with vac adv capped) then work with the springs then plug in/adj the vac adv. EDIT I see that race unit has no vac adv so that's 1 less subsystem to tune. After setting initial and total I'd mix/match springs till you get just under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day no matter what RPM that makes the slots max out at. You want the curve to start (point x) several hundred RPM above your idle speed in drive Last edited by RapidRobert; 10/23/13 11:51 AM.

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521054 10/23/13 04:28 PM 10/23/13 04:28 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Thanks! Did they come new with only one spring installed? shouldnt both weight have a spring (stock setup). 7897862-bild1.JPG (348 downloads) 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521055 10/23/13 04:35 PM 10/23/13 04:35 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Thanks! Did they come new with only one spring installed? shouldnt both weight have a spring (stock setup). I've never owned nor worked on one of the race units but I would think that they came with 2 springs but no worry, just set your initial correctly along with your idle speed & go from there. live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521056 10/23/13 04:56 PM 10/23/13 04:56 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Yes, for the moment I only have one spring and installed the distributor on 15 initial pointing at # 1 terminal at distributor. What happened was that the total timing was still 15 degrees. Turn the distributor to initial 33 which I want the total to be. The total was 33. It dont advance the mechanical or more correct, it go total mechanical direct. I will buy a springs and install one spring to each weight (two springs). I hope it then not directly go the maximum mechanical total advance. Hope you guys understand me, I'm swedish 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521057 10/23/13 05:02 PM 10/23/13 05:02 PM
Joined: Jan 2003 Posts: 74,974 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,974 U.S.S.A.	Are you able to move the rotor back and forth by hand if you hold the shaft that keys into the oil pump drive ? If so then it's doing what it is supposed to do with 1 light spring and those 2 weights ... go right to max advance at idle. That distributor is called a RACE distributor for a reason. If you want it to act like a street distributor then you'll need to put in springs similar to a street distributor.

Re: Mopar Performance race distributor mechanical advance [Re: JohnRR] #1521058 10/23/13 05:18 PM 10/23/13 05:18 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Yes I can, the mechanical advance work and I understand the total kicks in directly. I will put in one more spring and test and tune. I drive it to the races and want it to cruise in some way, even if it spit and roar. Thanks fellows! 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521059 10/23/13 06:37 PM 10/23/13 06:37 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Hope you guys understand me, I'm swedish Almost perfectly & your attitude is better than most. What double R said, get some heav(ier) springs in there so you can drive it then go to work on tuning it. Somewhere between 10-20 initial (depending on the cam etc) & 36 total & 2 springs would be a good start. Just me for a DD I'd find one with vac adv live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521060 10/24/13 02:15 AM 10/24/13 02:15 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Will pick up a new spring kit tomorrow. Dont know what brand but as I was told they are for recurve the mopar distributors. On dyno the engine worked out best with initial 15 and total 33 degrees. That it was I aim for... Thanks again! 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521061 10/24/13 10:18 AM 10/24/13 10:18 AM
Joined: Jan 2005 Posts: 1,466 malvern, ohio 3 3ddart pro stock
3ddart pro stock 3 Joined: Jan 2005 Posts: 1,466 malvern, ohio	here is a list giving distributor slot lengths for different degrees of timing. i had to weld my slots up on my hemi with the race distributor as if i set the initial to where it would idle the total was 45ish and if i set total at 38 it would die at idle. welded them up and demeled and filed them to get 14 degrees initial and all was fine then. Dave 7898756-distributorslotlenghths.jpg (417 downloads)

Re: Mopar Performance race distributor mechanical advance [Re: 3ddart] #1521062 10/24/13 03:16 PM 10/24/13 03:16 PM
Joined: Feb 2006 Posts: 643 southern conn 1 1969gtx mopar
1969gtx mopar 1 Joined: Feb 2006 Posts: 643 southern conn	If you only have one sping the advance will go max limit at a low rpm maybe cranking rpm. You need to add a sping then see if it has advance. 1965 A/FX Plymouth 9.50 et @139 mph 1965 A/FX awb plymouth flashback [email]10.26@129mph[/email] mph on pump gas 426 hemi 1969 GTX Hemi 4 speed 12.50 et @ 112mph in F.A.S.T TRIM 1970 GTX 4406pac 4 speed 11.05 @126.9 mph in F.A.S.T TRIM http://www.AFXER.com

Re: Mopar Performance race distributor mechanical advance [Re: 1969gtx] #1521063 10/24/13 05:42 PM 10/24/13 05:42 PM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Did you measure the final size of the Slots. Did it in some way ended up like the size/degree as the tabel? Do you know what spring you use. I assume you use Two springs. But was they light or heavy. Yes 1969gtx, it advance directly with one spring especislly when the point where the spring is mountrd was bend towards the spring. 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521064 10/24/13 09:44 PM 10/24/13 09:44 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: when the point where the spring is mountrd was bend towards the spring. Could be someone used a non Mopar spring & likely bent that so the spring they used (probably a shorter one) would work live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521065 10/25/13 04:56 AM 10/25/13 04:56 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Today I will pickup the spring kit and do some test and tune. I checked my MSD pro billet ditributor and it had the big black bushing (18 degrees mechanical advance) and one heavy silver spring and one light silver spring (not fast or slow curve just in the middle). This is what I will try to copy on the old MP tach drive distributor. Probably need to shortened the slots on the advance plate... Thanks for all help guys! 7900010-morosobild.JPG (224 downloads) 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521066 10/26/13 08:27 AM 10/26/13 08:27 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	I got two springs for ford but they worked, maybe kind of light also but will do some more test and tune. Now it dont get all mechanical advance directly. Unfortunatly its advance about 30 degrees... I will modify this part to get the correct mechanical advance. What is this parts name, advance plate? And mine is marked AC. Have seen marking on others here on internet as 11R and 15L but that assume is the degreesX2 of mechanical advance but what is the R and L, right and left? If, should R plates be used for smallblock (rotating direction clockwise) distributors and L ones for bigblocks (counter clockwise) dists. Cheers! 7901164-plate.JPG (237 downloads) 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521067 10/26/13 02:21 PM 10/26/13 02:21 PM
Joined: Aug 2003 Posts: 43,123 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,123 Bend,OR USA	Your right on the factory markings on the numbers and letters, right is clockwise and left is the other way The numbers are the amount of distributor degrees advance, not crankshaft degrees, so if it is marked 12 it ends up having 24 degrees advance at the crankshaft Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Mopar Performance race distributor mechanical advance [Re: Cab_Burge] #1521068 10/29/13 04:49 AM 10/29/13 04:49 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	I tig-welded the slots a bit and machined them to about 0.390 inch. Now I am bang on target on the total (and initial) timing. Maybe do some more testing and tuning on when it kick in. Have maybe some Mopar OEM springs waiting. By the way the tall-tale on the mechanical tachometers is a really kool feature! 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521069 10/29/13 10:44 AM 10/29/13 10:44 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You're almost there . I'd mix & match springs so the mech advance starts a couple of hundred RPM above your idle speed in drive which is what the eng will see stoplight to stoplight & then with just enough tension so you are just under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day. live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521070 11/05/13 03:25 AM 11/05/13 03:25 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	A friend of mine borrow me this spare distributor parts. The two weights (Part #1889284) I think is for small block distributors? The green spring which have the big loop on one side must be the heavy OEM spring. The first from left must be the light OEM spring? The other two short coil springs looks like mr. gasket 925B or Mopar performance recurve kit?? The broken/bend spring I dont even know if its a spring for a distributor. Thanks! 7912716-bild.JPG (252 downloads) Last edited by Snoddas; 11/05/13 03:28 AM. 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521071 11/05/13 10:46 AM 11/05/13 10:46 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: The two weights (Part #1889284) I think is for small block distributors? pretty sure & I will check The green spring which have the big loop on one side must be the heavy OEM spring. correct The first from left must be the light OEM spring? appears to be yes The other two short coil springs looks like mr. gasket 925B or Mopar performance recurve kit?? looks like em The broken/bend spring I dont even know if its a spring for a distributor. I agree Thanks! live every 24 hour block of time like it's your last day on earth

Re: Mopar Performance race distributor mechanical advance [Re: RapidRobert] #1521072 11/07/13 03:55 AM 11/07/13 03:55 AM
Joined: Sep 2009 Posts: 393 Sweden Snoddas OP enthusiast
Snoddas OP enthusiast Joined: Sep 2009 Posts: 393 Sweden	Haha Possible full score on the spring and weight test. As I mention shortened the slots in the advance plate about 0,04" gave me 18 degrees mechanical advance. Will now test and tune springs. I'm quite happy about the ford advance kit springs I have installed but will try two light mopar OEM springs. You couldent be too happy have ford part on a mopar... Stay cool! 1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone

Re: Mopar Performance race distributor mechanical advance [Re: Snoddas] #1521073 11/07/13 02:13 PM 11/07/13 02:13 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Will now test and tune springs. You couldent be too happy have ford part on a mopar. (1) Mix & match the springs till you are just under the pinging point at WOT up thru the gears. (2) since the springs are small (& generic) & hidden we'll let you slide on the furd parts (this time) live every 24 hour block of time like it's your last day on earth

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