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Old 10-27-2012, 03:59 PM
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timing at 34*

So i recently had my timing done and we set it at 34* with 93octane fuel with the vacuum advance un-plugged from the Edelbrock 600cfm manual choke off road/driver side port. I was told that i can't use vacuum advance on my motor but after i left it seemed peppy but i wanted more. So i plugged in the vacuum advance and it's running like a raped ape. Would i be concerned about anything bad resulting in my actions? Plugs getting too hot maybe?

I have noticed something in my engine bay making a thumping sound here n there when i kill the motor. Sounds almost like something exploding in the headers, small thumps gapped couple seconds apart.

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Old 10-29-2012, 09:35 AM
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I'm not that good at the tune up stuff, but I'd put the timing back or advance, then try it . I don't think the total timimg should be more than 34 total anyway...if there's weird sounds, it ain't right !
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Old 10-29-2012, 02:30 PM
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34* total mechanical advance should be good with high octane fuel.
The vacuum advance adds to that total, as much as 20*, when the manifold vacuum goes high as when you are at idle or light throttle. This helps with fuel economy and plug fouling if this a daily driver.
As soon as you touch the pedal the manifold vacuum drops and the timing returns to mechanical only.
In some cases this vacuum advance is too much advance and detonation (pinging) occurs.
Crane cams Crane Cams | Automotive Home Page makes a kit that replaces the stock vacuum canister that can be adjusted to prevent this detonation.

vicrod
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