Compression ratio and displacement

phunk

Exactly, displacement is all happening within the bore and stroke of the pistons, and has nothing to do with anything else.

Combustion chamber size applied to that displacement is what determines the compression ratio. There are a number of ways to change that chamber size without effecting displacement. You can change the shape of the piston dome, you can change the shape of the cylinder head chamber, you can raise or lower the wrist pin, you can change the headgasket thickness, and you can change the valve head shape. You could even change connecting rod length. All of these will change the total displacement of the chamber, but not effect the displacement of the engine.

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