We've previously mentioned that both intake and exhaust flow is unsteady and somewhat pulsating, punctuated by interruptions that include the opening and closing of valves and pressure excursions ...

This can be applied to both intake and exhaust valves. Reduced-diameter valve stems such as Manley’s Street Flo or Race Flo valves often exhibit a slight flow increase depending upon the ...

A careful inspection of the intake port, the intake bowl, and throat area under the valve revealed its generous size. In fact ... the-box flow of the E-head's exhaust ports were at a level ...

intake manifold port diameter and runner length, camshaft lift and duration, intake and exhaust valve sizes and cylinder head port volumes. When taking an engine to the extreme via extensive ...

The intake valves remain huge, at 2.13 inches (54mm) in diameter, which is actually one ... After combustion occurs, the exhaust exits through 1.59-inch (40.4mm) hollow sodium exhaust valves.

Valve overlap—that crucial interval when both the intake and exhaust valves are open, expressed in degrees of crankshaft rotation—is typically a fixed parameter and always a compromise.

Controlling them precisely was difficult, as there was no positive control over how they closed, and in many engines the restrictive bore sizes entailed using small valves. Using small valves ...