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initial timing,,,best vacuum
#1063943
08/27/11 02:46 PM
08/27/11 02:46 PM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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I think I have read this in the past, I know there are a lot of variables in determining best initial timing for an engine, but can I set the initial timing by getting the highest vacumme.
Is there such a thing as to much initial timing.
Thansk,
Jason
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Re: initial timing,,,best vacuum
[Re: Challenger 1]
#1063945
08/27/11 03:11 PM
08/27/11 03:11 PM
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Joined: Oct 2007
Posts: 3,911
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,911
Oregon
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the 'rule of thumb' I read here is to advance the initial timing until you get the highest vacuum reading, then retard it enough to drop 1"hg. You'll have to adjust the idle speed to keep it normal while you advance/retard the timing.
It should go to 30ish degrees at max vacuum, then drop back to 10-20* after losing 1"hg.
Then, adjust your springs so the timing doesn't come on until a few hundred rpms over idle, and limit your total advance to 32ish.
If you ever find yourself in a fair fight, your tactics suck.
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Re: initial timing,,,best vacuum
[Re: Challenger 1]
#1063946
08/27/11 03:26 PM
08/27/11 03:26 PM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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Quote:
Yes too much intial timing will cause starting problems and will add to the total timing. So that must be limited if you add intial timing.
Got to use a timing light, vacuum gauge and your ears.
Well, I certaily have all the tools, but my ears may not now what to listen for.
I was setting the timing this morning after replacing the advance springs in the dist. ( I limited the advance a while ago). I started out with initial in the mid 20s, and had great vacuum... it droped when I got the initial under 20.
Jason
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