150 "K" Compression Ratio
Dave, the combustion chamber volume on my 150 marked "K" on the lug measured 2.4cc. CC'd it 4 times just to be sure. If I use Clarence Lee's spec'd swept volume of 25.09cc it calculates to 11.45:1. If I use Mike Billington's spec'd swept volume of 25.18cc it calculates to 11.49:1. Either way it's fairly high, even with my piston pin being .25mm higher than yours. Head scratcher.
UPDATE: Reading back through some old threads William Robison had a high compression Saito FA150 marked with a "K" on the lug.
Last edited by Glowgeek; 01-21-2021 at 03:31 AM.