rotary disc valve

rotary disc valve
A valve employed as an intake control in modern two-stroke engines, consisting of a thin steel disc attached to one end of the crankshaft. The intake port passes trough to the disc valve assembly, and thus is normally closed off by the disc. To permit induction at the correct part of the engine cycle, part of the disc is cut away, opening the intake port for the required duration, independent of the piston position.

Dictionary of automotive terms. 2015.

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