Exhaust timing control device for two-cycle engine
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United States of America Patent
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-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Aug 1, 1989
filing date -
Aug 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust port controlling arrangement for an internal combustion engine having both main and auxiliary exhaust ports. A main control valve cooperates with the main exhaust port for varying the timing at which the exhaust port opens in response to engine speed. An on/off auxiliary control valve is positioned in a passage leading from the auxiliary exhaust port for opening and closing the flow through the auxiliary exhaust passage in response to an engine condition. Means retard the opening of the main exhaust port upon opening of the auxiliary exhaust ports to improve the power and torque curves of the engine.
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