[Tim Corcoran]

Originally Posted by Stan Weiss

Tom,
While increasing the rod length does change the piston velocity curve, where in the velocity curve are you looking at when you say velocity has increased? Peak velocity is actually reduced as you length the rod. You also move the point of peak velocity and where the rod and crank journal are at 90 degrees to each other farther ATDC.

Stan

It is my understanding that with a longer rod the piston dwells longer at TDC and gives more time for cylinder filling and this also increases piston speed at some point in the stroke over a shorter rod. I don't understand your statement that peak velocity is actually reduced with a longer rod or maybe my understanding is flawed.