Boring vs. Compression

[GNH.Wbst207V@xerox.com]

Ben Hodson writes:
        "...overboring an engine will *lower* the compression ratio unless
higher crown pistons are used or the head is planed...."

Ben has it (partly) wrong.   Compression ratio is:
        Cylinder volume + Combustion chamber volume
                8 by Combustion chamber volume.
Fitting higher-crown pistons or planing the head make the combustion chamber
smaller, increasing compression ratio.  Making the cylinder volume larger (by
boring) also increases the compression ratio - slightly.
George