Ignition timing

dgc333 said

The amount of intial timing an engine needs is a function of the cam and how much compression the engine has. Long duration cams need more timing as well as low compression.

24 degrees for an engine close to stock sounds like way to much but if you have a real radical cam maybe not.

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I must be missing something, the longer duration the cam the lower your compression number needs to be? So if I run 12:1 with a 255 @.050 duration it will run better with a 9:1 compression?

Or do you mean the longer the duration the cam the lower your cylinder pressure will be at cranking so you need more advance?

You must mean the latter because the cam will not change the compression ratio.