Piston ring
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A piston ring is a metallic split ring that is attached to the outside of a piston in an internal combustion engine or steam engine.
Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image.
Spring-loaded piston rings
Crankcase ventilation system
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A crankcase ventilation system removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source.
Piston ring
…to the engine. On the other hand, a large gap would cause insufficient sealing of the piston rings against the cylinder walls, resulting in excessive blow-by (combustion gases entering the crankcase) and less pressure on the piston, reducing the power output of the engine. The sliding motion of the piston…
PCV valve on Ford Taunus V4 engine (feeding from left side valve cover into the inlet manifold)
PCV system of a 1995 Mazda MX5 Miata
A PCV valve from a 1995 Mazda MX5 Miata