RE: Compression Ratio

["Randall Young" <Ryoung@navcomtech.com>]

> My TR3
> with new 86 mm
> pistons with the TR3 head will compute to 9.12:1 compression ratio as the
> combustion chamber on a TR3 head has less volume than the TR4
> head. (Unless it has
> be surfaced.)  I think with retarding the timing and an octane
> booster I'll be
> fine.

Kent, I doubt you'll even need that.  I'm currently running a stock TR3A
head with 87mm liners, and it doesn't want to knock even on what passes for
regular gas in California.

Randall