[Spridgets] COMPRESSION

David Lieb 72spridget at gmail.com
Wed Dec 23 07:38:10 MST 2009


>     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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