Wow lot of confusion. The facts as I see them are, the EJ 2.2lt turbo pistons will fit the EG3.3 bore, they are the same bore size, the wrist pin height and offset will be the same, They have the same selective fit as the SVX.
The piston crown height is what controls the compression ratio, they did not change the combustion chamber volume on the EJ 2.2 when they built the turbo, they just fitted pistons with a lower cut out in the top of the piston. These pistons lowered the EJ 2.2 's, 9.4:1 ratio to the turbo's 8:1, a drop of 1.4. If these pistons were fitted to the EG 3.3, the compression ratio would drop from 10:1 to 8.6:1.
I know that the SVX pistons have a raised lump, of about 1 to 1.5 mm on them, instead of a cutout that the EJ2.2 has(according to Wayne), so our cylinder head volume may be larger (may be due to bigger valves?), but the Turbos pistons will still drop the ratio by 1.4:1 at least.
Harvey.
