Patent ID: 6736100
Filing Date: 2004-05-18
Classification: F02B,F02M,Y02T

Abstract:
An outboard motor comprising a power head having a cowling enclosing a space, an engine disposed within the cowling and configured to drive a substantially vertically oriented crankshaft, and an air induction system disposed within the cowling and configured to deliver air from the space into a combustion chamber of the engine, the air induction system comprising an intake silencer and at least one intake runner, the intake silencer having an outer wall, an inlet port through the wall for drawing air from the space into the intake silencer, a runner extension pipe integrally formed with the intake silencer, the runner extension pipe having an upstream end and a downstream end, the upstream end opening within the intake silencer and the downstream end opening into the intake runner, and a runner hole formed through the outer wall of the intake silencer and communicating with the intake runner at a point adjacent the downstream end of the runner extension pipe, a valve disposed in the outer hole and configured to selectively open and close the hole, and when the valve is closed, an intake passage is defined from the upstream end of the runner extension pipe to a downstream end of the runner pipe, and when the valve is opened, the intake passage is defined from the runner hole to the downstream end of the runner pipe.