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A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
Cylinder and ports, viewed from above. Schnuerle porting [1] [2] is a system to improve efficiency of a valveless two-stroke engine by giving better scavenging.The intake and exhaust ports cut in the cylinder wall are shaped to give a more efficient transfer of intake and exhaust gases.
Crossflow cylinder heads are used by most modern 4-stroke engines, whereby the intake ports are located on one side of the combustion chamber and the exhaust ports are on the other side. The momentum of the gases assists in scavenging during the 'overlap' phase (when the intake and exhaust valves are simultaneously open).
The most basic design of a CAV fume hood only has one opening through which air can pass—the sash opening. [5] Closing the sash on a non-bypass CAV hood will increase face velocity (inflow velocity or "pull"), [ a ] which is a function of the total volume divided by the area of the sash opening.
Opening the intake valve while the exhaust valve is still open may cause unburnt fuel to exit the engine, leading to lower engine performance and increased emissions. According to engineer David Vizard's book "Building Horsepower", when both intake & exhaust are open simultaneously, the much-higher-pressure exhaust pushes the intake-charge back ...
GERD can cause inflammation of the lower esophagus caused by chronic acid reflux, making it hard to swallow. Related: The 7-Day GERD Diet Plan Registered Dietitians Swear By
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