Dave Plowman (News) wrote:
In article ,
Chris Bacon wrote:

The stroke of the piston and the size of the combustion chamber
determine the compression ratio.

No they don't.

Of course they do. It's the volume of the cylinder and combustion
chamber with the piston at BDC related to the volume with it at TDC.

Rolls eyes - the "stroke of the piston" does not equal
the volume. Your first statement is nothing like your 2nd.

The quoted stroke of the *engine* is a different matter since that's a
linear measurement. The 'stroke' of the piston is fine to describe its
movement from BDC to TDC.

But that isn't what you were talking about, is it. You said:

"The stroke of the piston and the size of the combustion chamber
determine the compression ratio."

They don't, do they.