Exhaust control valve for two-stroke cycle engines and process f

Details Exhaust control valve for two-stroke cycle engines and process f Exhaust control valve for two-stroke cycle engines and process f

1987-09-15

1989-05-16

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123323, F02B 7502

Patent

active

048299464

ABSTRACT:
An exhaust control valve for two-stroke cycle engines is disclosed. This valve is within the exhaust passage, seals against the piston, and delays opening of the exhaust passage to the combustion chamber during the expansion stroke of the piston for a preselected number of degrees of rotation of the crankshaft while permitting full opening of the exhaust port during the scavenging cycle. Also disclosed are means for modifying opening of the exhaust valve at high engine speeds to improve scavenging.

REFERENCES:
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patent: 4325335 (1982-04-01), Shibata
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patent: 4399788 (1983-08-01), Boutelmann
patent: 4516540 (1985-05-01), Nerstrom
patent: 4672924 (1987-06-01), Hiasa et al.
patent: 4672925 (1987-06-01), Miyata et al.
The High-Speed Two-Stroke Petrol Engine by Philip H. Smith, 2/1965, pp. 106-113 and 125.

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