Ignition Timing
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Racer
Joined: Sep 2002
Posts: 357
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From: Sayville New York
Ignition Timing
I haven't been around in a while My wife and I just bought our first house 4 months ago I have been so busy doing things to the house I haven't used the Vette at all this summer. But I have a week off from work and no money left to do anything to the house so It's time to use the vette. does any one know what the ingnition timing should be on my vette? It is an 81 but I took out the computer and stuff and just have a regular GM hei Dist. What should I set the timing to and at what rpm. Also does anyone know what the timing should be for the different spring combinations with a Mr. Gasket advance curve kit. Any help would be greatly appreciated. thanks.
Melting Slicks
Joined: Oct 2001
Posts: 3,025
Likes: 12
From: Pleasant Grove AL
I can give you some GENERAL guidance for a generic SBC that will probably get you real close. You will need either a degree tape on the balancer or a dial back timing light to set the timing and map the curve.
At something between 2500 and 3000 RPM (earlier is better), with the vacuum advance disconnected, all the mechanical advance should be in and you should see about 36-38* total advance. With the vacuum connected, you should get about another 16*, which will give you something in the low 50's cruising down the road. When you open the throttle, the advance will return to the 36-38* setting, and you shouldn't have a problen with detonation.
At something between 2500 and 3000 RPM (earlier is better), with the vacuum advance disconnected, all the mechanical advance should be in and you should see about 36-38* total advance. With the vacuum connected, you should get about another 16*, which will give you something in the low 50's cruising down the road. When you open the throttle, the advance will return to the 36-38* setting, and you shouldn't have a problen with detonation.
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Originally Posted by jaybird81
What should I set the timing to and at what rpm. Also does anyone know what the timing should be for the different spring combinations with a Mr. Gasket advance curve kit. Any help would be greatly appreciated. thanks.
