> While I don't KNOW much, I would think that a compression check
> would only tell you that the rings/piston are good. what you need
> to know is compression VOLUME .. from the bottom of the stroke to
> the top, added to the volume of the head. .. That is you should
> be looking at volume difference caused by the movement of the
> piston, not how well it seals.
A compression test would give you some interesting, useful, but
inconclusive evidence.
I know some race groups do some they call "pumping" the engine which
can find things like that, but I do not know what all is entailed,
although I understand it is non-destructive. Anybody know more about
it?
David L
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