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Old 06-13-2009, 09:39 PM
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Base TIming

The motor is a 427 SBC . Cam is 240/246 HR set on 108* centerline. 1.6 Rockers. 10.5ish compression.

Motor seems to like timing. I have the base timing set at 16* right now. There's no pinging on premium pump gas. I am using the stock ECU it's a 1990 Corvette. Don't tell me I need a better ECU, it's my mission to use it.

How much base timing do you think I can get away with? How high have you guys put it?

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Old 06-13-2009, 10:07 PM
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This is how I set base timing on performance engines.

I hook up a vacuum gauge to manifold vacuum, and advance the distributor to it's maximum vacuum at idle. I then retard the distributor timing by 2 inches of vacuum. This is done with everything hooked up. Now you can disconnect your vacuum advance, and look, and record your new base timing, if it rev's OK.
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Old 06-13-2009, 10:10 PM
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Quote:
Originally Posted by carsavvycook
This is how I set base timing on performance engines.

I hook up a vacuum gauge to manifold vacuum, and advance the distributor to it's maximum vacuum at idle. I then retard the distributor timing by 2 inches of vacuum. This is done with everything hooked up. Now you can disconnect your vacuum advance, and look, and record your new base timing, if it rev's OK.
No vacuum advance, all electronic. There's the ESC (electroic spark control) that gets disconnected. No vacuum advance.

But can still do the same.
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Old 06-13-2009, 10:23 PM
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I have used this method for years, and found sometimes a timing light will lie.

With your new rear gear, it may like it's best vacuum reading. I don't think it would 'ping' with your injectors.
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