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View Diary: NASCAR Has A Class Problem (101 comments)

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  •  Right (0+ / 0-)

    So if officials measured cylinder diameter the displacement would be less when hot.  But if they measured hot pistons, the displacement would be more.

    I guess the crankshaft throw would increase when hot too.


    Even Democrats can be asses. Look at Rahm Emanuel.

    by Helpless on Mon Mar 18, 2013 at 10:30:25 AM PDT

    [ Parent ]

    •  Um, no (0+ / 0-)

      There is no circumstance where expanding metal is going to increase the displacement. The displacement is the volume of empty space. The space is created by the metal surrounding it. And expansion of any of the metal would reduce the space, including the pistons. In any case, the measuring protocol would account for that, I'm sure.

      •  a nit (0+ / 0-)

        You are correct.  However, the comment was that the fine resulted from measuring a hot engine.  The only ways I see that this could happen without a measuring error would be to

        1. Measure piston diameter.  This would give a figure a few thousandths less than a direct measurement of the cylinder diameter -- a larger difference in a cold engine than when hot. This would be an incorrect procedure because piston rings fill the space between the piston and cylinder walls so the area swept is indeed the diameter of the cylinder.

        2. The crank shaft throw increased enough when hot to matter more than the decrease in cylinder diameter.  

        Either way, it sounds like a bogus claim to me.  I can't imagine officials handling a hot engine to do their measurements.

        Even Democrats can be asses. Look at Rahm Emanuel.

        by Helpless on Tue Mar 19, 2013 at 10:40:45 AM PDT

        [ Parent ]

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