Two cycle engine with vaned diffusing exhaust port

Details Two cycle engine with vaned diffusing exhaust port Two cycle engine with vaned diffusing exhaust port

1989-06-21

1990-05-01

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123323, F02B 7502

Patent

active

049209310

ABSTRACT:
A two cycle engine is provided with a diffusing exhaust port which includes axially spaced separating vanes that divide the port into a plurality of axially spaced passages to more closely approach ideal diffusing exhaust flow during all degrees of exhaust port opening and thereby maximize the exhaust energy recovery during blowdown and the entire exhaust process. A timing valve may be used at the port outlet or elsewhere to block flow through the upper port passages and allow greater expansion of the combustion gas in the cylinder at part load while maintaining efficient energy recovery by diffusing flow in the open passages of the exhaust port.

REFERENCES:
patent: 1514476 (1924-11-01), Still
patent: 4112882 (1978-09-01), Tews
patent: 4121552 (1978-10-01), Mithuo et al.
patent: 4651686 (1987-03-01), Kania
patent: 4660514 (1987-04-01), Nerstrom
SAE Paper 871653--A Method of Separating Short-Circuit Gas from Exhaust Gas in a Two-Stroke Cycle Gasoline Engine (A Good Use of Exhaust Gas) Sep. 14, 1987.

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