[mkpontiac]

Assuming all is correct in an engine combo with no pinging present and then the compression ratio is increased such that pinging is present. In general will the pinging occur in a particular RPM range relative to peak torque? If so will it be before, at or after peak torque?

I am guessing how wide the pinging range becomes would depend on how much the compression ratio was increased.

Mark

[68gtoMN]

It's not just compression. With compression you need to rethink your advance curve and your camshaft selection. Compression alone is not the key to providing improved power. The timing of your valve events, your spark and fuel requirements will also need to be addressed. The Ping can be caused by a lean condition, too much cylinder pressure or an ignition curve that is too advanced. Regardless, do not play with pinging. I have several sets of pistons that have missing ring lands and are pock marked due to excessive pre-ignition. You don't want that