Outboard Marine Corporation

George T Gillespie

H Norman Petersen

Fletcher C Belt

A two-stroke internal combustion engine comprising an engine block, a plurality of crankcases and including a mounting surface having therein a plurality of inlet openings each communicating with a respective one of the crankcases, a throttle housing defining a throttle passage and including a plenum mounting surface, a throttle valve in the throttle passage, and a plenum member which is separable from both the engine block and the throttle housing and which defines a plurality of intake passages each having an outlet end communicating with a respective one of the inlet openings and each having an inlet end communicating with the throttle passage such that the intake of the engine can be tuned solely by modifying the configuration of the plenum member.

Two-stroke internal combustion engine with improved air intake system

A marine propulsion device comprising a propulsion unit which is adapted to be mounted on a boat and which includes a propeller shaft and an internal combustion engine drivingly connected to the propeller shaft, the engine including engine block structure having a combustion chamber and defining an air intake passage communicable with the combustion chamber, a throttle plate movably supported by the engine block structure and located in the air intake passage, structure for moving the throttle plate in response to movement of an operator control member, and structure supported by the engine block structure for providing a signal indicating the position of the control member independent of the position of the throttle plate.

Throttle lever position sensor for two-stroke fuel injected engine

A two-stroke internal combustion engine comprising a combustion chamber, a fuel injector for injecting fuel into the combustion chamber, an intake passage communicating with the combustion chamber, the intake passage including a venturi section, a throttle in the intake passage, and an engine control for sensing the pressure P.sub.V in the venturi section during engine operation, for sensing throttle position TP, for determining, in response to TP, a specific amount of fuel to be injected by the fuel injector, and for modifying the specific amount of fuel in response to P.sub.V.

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Franklin, WI, United States of America

George T Gillespie