[Eagledriver]

What is your static compression ratio? Dynamic compression ratio is virtually meaningless. Dynamic compression ratio would only mean something if computing for an incompressable gas. Of course an incompressable gas would lock the engine so it wouldn't be much use there either. There is a reason that in engine octane and advance discussions static compression ratio's are used. If you are above 9.8 static compression ratio you will probably need to retard your timing or run race gas or a combination of both.

Sorry to be so blunt about this but it keeps coming up. You can get an idea of acceptable CR and advance by looking to the various Porsche factory engines. The 2.2 S used 9,8 pistons (I think). It needs 92 Octane fuel. The 2.4 S used 8.5 pistons and could use 87 octane.

Sounds like a fun project.

-Andy