to fishy68.
What i am saying is initial timing is not really a performance setting.
I assume you mean a WOT performance setting because it does affect part throttle performance.
YES it will give you all the things you said \\ better mpg \\cleaner plugs\\
smoother idlle.UNDER LIGHT THROTTLE ONLY.
But i am a little confused by your statment that your motor will have spark knock with at anymore then 35 degrees total timing???
Anymore than 35 degrees total timing it spark knocks at WOT. Not under light throttle, at WOT.
Yes i understand your motor suffers from spark knock at 35,but how is hooking up your vacume advance with 18 MORE DEGREES of timing going to take the spark knock away???
Ok let me rephrase that. My engine will only accept 35 degrees total timing at WOT. It will accept more at part throttle cruising because the load on the engine is lower. I didn't think I made it sound like the vacuum advance will make spark knock go away. That's not what I meant.
Your motor has too much cyilinder presure,thats why you can't go past 35 degrees total.
You said this happens when you run your motor with the distributer vacume advance system not hooked up.(less timing=more knock Please explain, you lost me there.)
What I said above. The only time it has more timing is under light throttle since the vacuum advance is hooked up to ported vacuum.
I was saying that a motor properly tuned will not need anymore then the total timing set to run really good as far as drag performance goes.
THE WAY YOU HAVE YOUR CAR SET UP WILL BEAT MINE IN THE ECONOMY DEPARTMENT FOR SURE.I am trying to make a faster car and not a gas saver.:) I say that with no disrespect
I mean no disrespect either.
The part i was saying about the vacume advance when not hooked up can affect your timing at high rpm's(over 5000 grand)is that it does move and is part of the distributers timing system and will affect your timing.
People that run high rpm motors will take the hole vacume canister right off the distributer and put a lock out rod in there.
I still can't understand how the vacuum advance causes erratic timing at high rpm's when it does not move. I think in most cases it's the control box that is causing the erratic timing, not the distributor. Most stock control boxes don't work well at high rpm so that's why you swap to a better system.
GO TO MANCINIS SITE AND YOU WILL FIND THIS LOCK OUT DEVICE, EVEN FOR MSD DISRIBUTERS THAT HAVE A VACUME CANISTER.
Yeah I know what your talking about. I've used them before.
Everyone knows when they time a stock distributer motor and rev it past 5000 you will see the timing marks start to shake and become not a single line anymore.This is because the stock distributers internal parts start to move and screw with your timing.
Again what I said above. I believe it's more to do with the control boxes. Now if the shaft bushings are worn out or something is loose it can cause erratic timing. That's why when you go through the distributor you make sure everything is tight.
When you use a stock distributer ,for a performance DRAG CAR\STREET CAR ,the list of performance improvments go's like this:
1)CHANGE THE ADVANCED WEIGHT SPRINGS \\ JUST LIKE THE MOPAR THE PERFORMANCE DISTRIBUTER.
2)TAKE OFF THE VACUME ADVANCE CANISTER AND LOCK IT OUT.
Sorry but I can't agree that you remove the vacuum advance on a street car. A street driven car will almost always benefit from a vacuum advance IMO.
3)LOCK OUT THE ADVANCE WEIGHTS
4)GET A MSD OR BETTER DISTRIBUTER CAUSE YOU DON'T NEED A FACTORY ONE ANYMORE.
I did not get my info from 30 years ago and i never even talked about what vacume port to hook a vacume advance up to for it to work correctly and yes the shop rags do talk to me and i have a name for each one.:-D
I realize you didn't say what port to hook the vacuum to but the only one that can provide vacuum signal at idle is a full time vacuum port. I did make an assumption but it was based on you saying "The vacume advance on a stock engine gives the engine more initial timing". That was a direct quote from your earlier post.
P.s.|||phisy68 waiting for your reply about how more timing helps you with your spark knock:-k
Read my statement above explaining it.
BUY THE WAY I LIKE YOUR CUDA \\IT'S COOL
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Everyone has there own way of doing stuff and thats what makes it fun.
