In article
Chris Bacon wrote:
Rob Morley wrote:
EricP wrote:
Dave it is all to do with the stroke of the pistons and size of
compression chamber. Believe me, it's factual!

Combustion chamber, compression ratio, it's the crank that has a stroke
not the piston ...

Hm. "stroke", or "throw"?

That's like saying of a circle "diameter or radius?"