Exhaust port of two cycle engine

Details Exhaust port of two cycle engine Exhaust port of two cycle engine

1973-08-09

1976-03-23

Burns, Wendell E.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65R, 123 73A, F02B 2514

Patent

active

039453545

ABSTRACT:
The exhaust port of a spark ignition two cycle engine has the general shape of an inverted T with a base portion and a narrower upwardly extending stem portion. The top of the base portion is approximately at the level of the top of the transfer port which admits fuel-air mixture to the engine cylinder. The top of the stem is from 20.degree. to 55.degree. of crankshaft rotation in advance of the opening of the transfer port. This configuration of the exhaust port produces a low broad blowdown pulse which in turn results in a low noise level of the exhaust.

REFERENCES:
patent: 960797 (1910-06-01), Blair
patent: 990974 (1911-05-01), Giles
patent: 1263820 (1918-04-01), Tidman
patent: 1518983 (1924-12-01), Hyvernaud
patent: 3240194 (1966-03-01), Rychlik

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