Planing boat engine

Details Planing boat engine Planing boat engine

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.

REFERENCES:
patent: 4399788 (1983-08-01), Bostelmann
patent: 4723514 (1988-02-01), Taniuchi
patent: 4793347 (1988-12-01), Taniuchi et al.
patent: 5190006 (1993-03-01), Motoyama et al.
patent: 5588402 (1996-12-01), Lawrence
patent: 5782214 (1998-07-01), Nanami et al.
patent: 5873334 (1999-02-01), Heinrich

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