In a message dated 97-07-12 05:09:09 EDT, ensgwo@bath.ac.uk (Dr G W Owen)
writes:
> Can anyone tell me if there is a way of checking the capacity of an engine
> through the plug hole? You can not measure the gas because of valve
> overlap, so it has to be a physical measurement of bore and stroke.
>
> Geraint Owen
>
Having worked in the pits at NASCAR races, a NASCAR official will come around
the pits with a wooden box lined with velvet. Inside is a much coveted glass
tube with a piston inside. On one end is a hose that is put in a spark plug
hole. The outside of the glass tube has graduations on the outside. This
device is used to "pump your motor" to check for displacement.
NASCAR commonly creates their own methods and devices for checking cars, and
they were not very fond of fielding questions about this device when I was
asking.
Bruce McGuire
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