Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1998-06-08
2000-02-08
Wolfe, Willis R.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65PD, 123 65V, F02B 7502, F02D 904
Patent
active
060217480
ABSTRACT:
A control arrangement for a planing-type boat having an engine powering a water propulsion device is disclosed. The engine has at least one combustion chamber, an exhaust port leading from the combustion chamber, and an exhaust timing valve cooperable with the exhaust port. The exhaust timing valve is moveable between a first retracted position and a second extended position, where in the second position a flow of exhaust through the exhaust port has a shorter duration than when the valve is in the first position. A drive unit is associated with the exhaust timing valve. The control is arranged to move the exhaust timing valve with the drive unit from the second position towards the first position at a predetermined high engine speed. The control is arranged to prevent the rapid movement of said exhaust timing valve between its first and second positions when the engine speed fluctuates about the predetermined engine speed.
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patent: 5873334 (1999-02-01), Heinrich
Hairston Brian
Wolfe Willis R.
Yamaha Hatsudoki Kabushiki Kaisha
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