Sylvain VAN DER WALDE wrote:
"Chris Bacon" wrote...
Sylvain VAN DER WALDE wrote:
"Chris Bacon" wrote...
Dave Plowman wrote:
The stroke of the piston and the size of the combustion chamber
determine the compression ratio.
[CPB disagreed]
Chris.
You're making a fool of yourself. Just listen to Dave Plowman (and
others).

Above is what DP says determines the CR. Do you *really* agree, or
can you add something to that statement to make it right?

Hmm! Let's try.

As the piston rises to T.D.C. (top dead centre), that fuel/air mixture
will be compressed to an extent determined by the stroke/bore ratio of
that particular engine and the capacity of the combustion chamber.

You're sort of getting there, in that you've added the bore as well as
the stroke, which was missing from the quote I included above.