OST and JE Piston collaborate - New piston!

[oldeskewltoy]

One last bit.... the crown can be machined as much as .030" (.76mm). This will remove .9cc from the crown, dropping total crown volume down to 1.6cc. This will lower static compression by about 1/4 of a point.

So in an undecked block, under a 36cc chamber running a stock head gasket... these pistons can offer a static CR as low as 10.6 to 1. At the other extreme, with a decked block, small - 33cc -chambers, a stock gasket, and full crown(2.5cc) these pistons will deliver a static compression of 11.8 to 1.