Quote:
Originally Posted by Marbot
The pistons are moving the flow of the exhaust gases as they do in any other car fitted with an i.c. engine.
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On any i.c. petrol engine the piston 'pumps' about 2% of the total exhaust gas volume - the rest evacuates the cylinder under the force of it's own expansion due to the pressure differential between cylinder and ambient.
However, persuing your argument, the piston does the same on throttle - so it would still be a moving aerodynamic device.....