Should I remove MSD pro billet, for stock distributor?
#1814097
04/28/15 07:40 PM
04/28/15 07:40 PM
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Posts: 6,906 IL, Aurora
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I've been fighting two problems 1- running hotter on expressway, doesn't overheat but does run about 15 to 20 degrees hotter and comes right down when off the expressway. I've gone through everything and system is good with a 4 row, clutch fan, etc. Other problem is at cruise anywhere from 30mph to expressway speed , when you squeeze the gas it seems to have a stumble/lag for second, like a lean spot. My MSD is at 18 initial and 30 total, I have about 11.25cr and 30 is about all I can go on pump 93. Will the vacuum advance help with the overheating at highway speeds and the tip in stumble? I will be putting a innovate A/F gauge in soon.
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: Twostick]
#1814219
04/28/15 10:36 PM
04/28/15 10:36 PM
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It should IF the engine can tolerate the extra timing at light load. I don't think it will affect the stumble.
What heads do you run?
Is that an Edelbrock carb?
Kevin It's a 360 with J heads, mechanical 6 pack
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1814246
04/28/15 10:54 PM
04/28/15 10:54 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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(1) put in several gallons of race or av gas & bump the timing up to where it should be for your eng (more total/faster curve (lighter springs) cuz your timing is retarded & see how the temp does. (2) What Lewt said confirm your jetting is in the ballpark just bump em up quite a bit for a test just like purchasing the av gas, a one time deal & blocking the rods up (eddy) is one way to do that to put you on the power circuit. (3) if still running hot then I'm thinking there is either a water flow restriction (likely) or grille (airflow) restriction (less likely). lower hose needs a spring/toss the stat for a quick test (wont hert the eng for just one time). belt tight (I'm sure you've checked it already (pump speed). rad IS unobstructed right? more rare is a rusted up block cooling passages or a slight combustion leak into the cooling system (an emissions testing station can stick the probe into the dead air space above the coolant & it'll show a reading if there are hydrocarbons present (combustion leak), in drive/ebrake on/foot on brake power brake it as a minor leak might need it to be pushed hard for it to show up. Holler how it turns out. water temp gauge you have is confirmed accurate right?
live every 24 hour block of time like it's your last day on earth
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1814457
04/29/15 10:05 AM
04/29/15 10:05 AM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
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I've been fighting two problems 1- running hotter on expressway, doesn't overheat but does run about 15 to 20 degrees hotter and comes right down when off the expressway. I've gone through everything and system is good with a 4 row, clutch fan, etc. Other problem is at cruise anywhere from 30mph to expressway speed , when you squeeze the gas it seems to have a stumble/lag for second, like a lean spot. My MSD is at 18 initial and 30 total, I have about 11.25cr and 30 is about all I can go on pump 93. Will the vacuum advance help with the overheating at highway speeds and the tip in stumble? I will be putting a innovate A/F gauge in soon. It's lean as heck I bet. And race gas will do nothing for the leanness.
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: Challenger 1]
#1814506
04/29/15 12:05 PM
04/29/15 12:05 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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what a (1) tank addition of some race/av gas will do is allow him to restore his timing to a normal setting to see if retarded timing is what is making him run hotter.
live every 24 hour block of time like it's your last day on earth
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1814727
04/29/15 06:57 PM
04/29/15 06:57 PM
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Joined: Jan 2003
Posts: 26,039 Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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My MSD is at 18 initial and 30 total, If you think a stock distributor would be better, are you aware that the MSD curve can be changed (stop bushing/springs) to mimic the stocker?
The INTERNET, the MISinformation superhighway
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: John_Kunkel]
#1814779
04/29/15 08:19 PM
04/29/15 08:19 PM
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Joined: Sep 2004
Posts: 6,906 IL, Aurora
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My MSD is at 18 initial and 30 total, If you think a stock distributor would be better, are you aware that the MSD curve can be changed (stop bushing/springs) to mimic the stocker? Yes but my MSD has no vacuum advance,
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1816543
05/01/15 06:17 PM
05/01/15 06:17 PM
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Joined: Jun 2006
Posts: 5,169 CT
GTX MATT
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Vacuum advance will help. You can trigger the MSD with a stock points or a Mopar Electronic distributor. But if you have detonation issues I'm not sure how easy you will find it to run the vacuum advance.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1816645
05/01/15 08:31 PM
05/01/15 08:31 PM
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Joined: Jan 2004
Posts: 8,380 fredericksburg,va
cudaman1969
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18 to 30 degrees, that's only 12 degrees. Try to open it up so maybe 13 to 37 with med springs. The higher timing should help at cruise speed. If the engine has a bigger cam you probably need more main jet and idle jet. What is the idle vac, and I mean 550 to 650 rpm, if you can't get that low there's one of the problems.
Last edited by cudaman1969; 05/01/15 08:37 PM.
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Re: Should I remove MSD pro billet, for stock distributor?
[Re: ademon]
#1817054
05/02/15 01:53 PM
05/02/15 01:53 PM
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Joined: Jan 2003
Posts: 4,769 Moved to N.E. Tennessee
GomangoCuda
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1. Too much compression for iron heads and pump gas. Either use better gas, lower compression, or get aluminum heads. Take your pick, none of them is an inexpensive solution.
2. Are these the 4782/4783 mechanical carbs with accelerator pumps on all 3 and fuel inlets on the driver side or are they stock carbs with mechanical linkage added ditching the vacuum pods?
3. No one has asked so I will. What jets are in the carbs? All of them. What pump nozzles? What power valve in center carb? Has anything else been altered, such as, Idle air bleeds, idle feed restrictions, main air bleeds, power valve channel restrictions?
In theory, there is no difference between theory and practice. In practice, there is.
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