Movement of the piston creates a pressure drop across this window. In fact, the relationship between piston movement and valve movement can affect net cylinder filling (volumetric efficiency or VE).

Deciding which valve to use for a hydraulic or pneumatic system depends on a couple of design factors: the internal design of your circuit and the overall function of your valves. The two major valves ...

Q:I have a 327 in my '31 Ford that features nearly the same cam and components as the one you referenced recently in Pit Stop (Nov. '12). Since a 1.6:1-ratio rocker arm will push the valve a little ...