Originally Posted By: Seguino
Quote from the article
"For every complete revolution the crankshaft makes, a piston travels up and down one time. We will call this a stroke. At 3800 RPM (Rotations Per Minute) and roughly 65MPH, each piston in a V8 engine strokes 475 times per minute or approximately 8 times per second! "
When the V8 engine in my pickup is turning 3800 RPM, I do believe each piston is going up and down 3800 times. Maybe that's how they got so many miles on that car. It has pistons that only stroke once for every eight crank revolutions.
Mechanically speaking, each revolution the crank rotate once, and therefore each component connecting to it will go up and down once, so at 3800rpm, each piston go up and down 3800 times per minite, or 63.3333 times per second.
The limitation is ususally the velocity of the piston travel, so high redline engine usually have lower crank to rod ratio. Each stroke in these engine is shorter than a stroke in a lower rpm engine with higher crank to rod ratio.