Bill I have dynoed a lot of engines and we instrument the pressure in the
exhaust. The average is so minimal as to be unimportant with an open exhaust
car..Been there done that have data to show it.
Dave
ardunbill@webtv.net wrote:
>
> Dave, there is still pressure over the piston on the exhaust stroke as
> it pumps the exhaust gas, the exhaust valve stays open a long time after
> TDC. Granted, the pressure is not as much as on the
> compression/expansion stroke, but it is still present reducing the
> stress on the rod. No doubt figures exist in textbooks for the amounts,
> but the exhaust gas has weight and it is not able to blow out the port
> and pipe by itself entirely. Cheers Bill
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