Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1993-12-23
1995-05-02
Okonsky, David A.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65V, F02B 2704
Patent
active
054109930
ABSTRACT:
An exhaust control valve arrangement for a two cycle internal combustion engine for altering the compression ratio to provide optimum running under all conditions. An arrangement is provided for cleaning the exhaust control valve and its surrounding cooperating surfaces of the engine upon shutting off of the engine to preclude the formations of deposits that can cause sticking of the valve element. The valve element is rotated through a number of cycles after the engine is stopped through a wider range than during its normal valving operation for removing deposits. The number of cycles is chosen in response to an engine condition such as length of time of running or amount of lubricant supplied to the engine. Various valve arrangements are disclosed that improve the cleaning operation and permit cleaning even while the engine is running.
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European Search Report dated Mar. 28, 1994.
Maebashi Kousei
Masuda Tatsuyuki
Nakamura Michihisa
Suhara Hidenori
Okonsky David A.
Yamaha Hatsudoki Kabushiki Kaisha
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