But there was a period when steam engines were much more accessible, before internal combustion ... valve powered by a linkage from the crankshaft and using the spark plug hole as an inlet and ...

NEVIS stands for New Exhaust Valve & Intake System ... and uses energy of the engine's exhaust vacuum to assist in the combustion cycle, also enabling it to produce six times the number of ...

At bottom-dead-center (BDC) the inlet valve ... the exhaust valve is open and the combustion products are expelled from the cylinder. The sequence shown on the next page represents this behavior for a ...