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Topic Review (Newest First)
04-26-2011 12:38 AM
aprilworkheiser Thank you for this wonderful knowledge base entries. I love to read more from you guys though this thread hasn't been updated yet. I've been searching for so long over the internet regarding the list of distributors. Thanks for reposting this entry!
07-26-2008 04:59 PM
redlightning Great thread.Thanks Rick Wi.


(I know that it is old,I was searching and thought it would be a good one to bump for folks that have not read it)
03-08-2005 09:42 AM
k-star
advance

Quote:
Originally Posted by Rhansen
If running vac adv from a manifold source the can will give full advance on deceleration (i.e. at the end of the 1/4). Is this hard on the motor?
I am with rick on this one. There is no load past the stripe, so you can get away with alot of timing with-out any damage...

Keith
03-08-2005 09:40 AM
Rick WI
Quote:
Originally Posted by Rhansen
If running vac adv from a manifold source the can will give full advance on deceleration (i.e. at the end of the 1/4). Is this hard on the motor?
NO, as there is no load on the motor.
03-08-2005 09:14 AM
cuda66273 Or turn it over to a professional and have it done correctly, on a distributor machine.
03-08-2005 07:46 AM
Rhansen If running vac adv from a manifold source the can will give full advance on deceleration (i.e. at the end of the 1/4). Is this hard on the motor?
03-07-2005 09:03 PM
Rick WI
Quote:
Originally Posted by 57NAPCO
WELL....she's LONG GONE ...
I could use some tips on how to accomplish that, cheaply.
03-07-2005 08:38 PM
strikingthematch Thanks Rick. I know someone around here had said something about that and it got me thinking. I just wanted to know what it did. Again thanks great post by the way very useful.

Chris
03-07-2005 08:35 PM
57NAPCO Ok, thanks for the clarification...just need a little directional shove...and as far as the wife, LMAO.... WELL....she's LONG GONE ...
03-07-2005 08:25 PM
Rick WI Yes moving the wires on the terminals would be like stabbing in the distributor one tooth off.
03-07-2005 08:06 PM
strikingthematch Let me ask something here. You know the so called old red neck way of moving the spark plug wires one over in either direction on the terminals. How much timing does that acount for. Would it be kinda like moving a dis. one tooth or two? I mean I know you then have to turn the dis. to get your mech. adv. but as far as int. goes if you move the dis. how much does that effect timing? SOmething I have been wondering.
Thanks

Chris
03-07-2005 07:44 PM
Rick WI
Quote:
Originally Posted by 57NAPCO
Ok, a little help here...

This article completely hypnotized me.. And what i got outta it was, dont buy that new Pertronix Flamethrower that was recommended in the 383 stroker article ive followed for my build?
And i should go and buy the distributor w/points and use the vac. control can you suggested?

I dont mean to sound ignorant, LOL but i am at this point, but im reading...
I need a little clarification... in a more layman's term...PLEASE..

thanks DJ
Kinda like when the wife goes on and on and on and.....anyway I digress.

Although I don't use Pertronix that is the type of distributor (electronic) you'd want to use. You would not want a points type.
03-07-2005 07:26 PM
NAIRB
Quote:
Originally Posted by Jmark
Well, as one who has ALWAYS pushed for "Ported vacuum" advances, i'll bite and say I've seen the light. Guess I'll go take the plug off my advance and try manifold and see how it goes.

Since everyone seems to now be on the same page here, i'll ask a question.
My truck is a 1/2 ton chevy, .030 350. 9.2 comp, cam is a Crane 276 ( I think). Headers, Q-jet, mild head work on my 882's with automatic tranny.

I run about 10 to 12 degrees initial timing, plus my weights push the timing to 35 full in by 2600rpm. My normal cruise speed in town is about 2100 and freeway is 2700@65mph. So....according to the article, I can use another 10+ degrees of vacuum advance at idle? My truck idles fine and does not overheat at all. Is this extra 10+ degrees really necessary in my case? Or is it overkill? I guess the plus side is more timing at cruise speed hopefully giving me a little better mileage. My biggest problem is actually hearing the pinging. I never do anymore since my hearing has gone south. Guess I'll have to take my son along for the testing.

Feedback welcome!!

Mark

The real meat of the entire thread is that regardless of what means you use to provide spark lead to your engine, your engine is going to like a specific amount of timing under specific operating conditions (for ideal combustion burn). This is going to be a trial and error process for each individual vehicle, but with the information available, one should be able to design something that is close to ideal, and could be fine tuned to perfect the entire curve.

This thread by Rick W is pretty much how I've always done it myself, and it's not a difficult process to comprehend.

In this day and age of EFI and DIS, it's not that common anymore to find mechanics that can tune older carbureted, distributor type engines.

I've seen tons of fresh tune-ups that ran like crap. Many of them run poorly because somewhere in the fray, the engine's spark advance was plumbed into ported vacuum. The difference between the two in my experience has been night and day, and I have ALWAYS used manifold vacuum, even when the if the factory used ported. The sound of an engine's "sweet spot" is readily evident when you get it right. Anybody can tailor their own custom curve if they've got an advance timing light or timing tape properly installed, and a vacuum guage. No black magic involved at all.
03-07-2005 05:57 PM
57NAPCO
WAY over my head, shewwww

Ok, a little help here...

This article completely hypnotized me.. And what i got outta it was, dont buy that new Pertronix Flamethrower that was recommended in the 383 stroker article ive followed for my build?
And i should go and buy the distributor w/points and use the vac. control can you suggested?

I dont mean to sound ignorant, LOL but i am at this point, but im reading...
I need a little clarification... in a more layman's term...PLEASE..

thanks DJ
03-07-2005 04:04 PM
Jmark Well, I think my sons adjustable light is still here so I'll go give it a try. I'll double check the mechanical and total again. I redid it a week ago when I noticed my weights had gone stuck AGAIN fully advanced. Getting tired of pulling the dist and tearing it down and cleaning the shaft!
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