2-cycle engine

Details 2-cycle engine 2-cycle engine

1992-10-26

1993-08-31

Cross, E. Rollins

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65R, 123 65P, F02B 3300

Patent

active

052399508

ABSTRACT:
A number of embodiments of outboard motors embodying pressure scavenged 2-cycle internal combustion engines. In each embodiment, a plenum chamber serves the scavenge passages of the engine and the pressure relief for a scavenge pump is provided by a pressure relief valve in the plenum chamber so as to reduce the opening and closing of the pressure relief valve due to pulsations caused by the engine operation. In one embodiment, the pressure is relieved by discharging the air to the exhaust system for silencing and also for cooling the exhaust gases. In other embodiments, the air for pressure relief is discharged to the atmosphere.

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patent: 4254752 (1981-03-01), Friddell et al.
patent: 4907549 (1990-03-01), Morikawa et al.
patent: 5143028 (1992-09-01), Takahashi
patent: 5146899 (1992-09-01), Tanaka et al.

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