Patent ID: 6298815
Filing Date: 2001-10-09
Classification: F02B,F02M,Y02T

Abstract:
An outboard motor comprising a powerhead including a four-stroke V-type internal combustion engine and a cowling covering the internal combustion engine, the engine having an output shaft and being mounted in the powerhead so that the output shaft rotates about a generally vertically extending axis, the engine including a crankcase having an upper surface and first and second cylinder banks connected to the crankcase, each cylinder bank including at least one cylinder having a longitudinal axis and defining at least in part a combustion chamber, the cylinder banks forming a valley therebetween, the engine having an induction system comprising an air inlet, an induction passage extending from the air inlet and configured to guide air into the engine for combustion purposes, a throttle device provided in the induction passage, the throttle device being positioned at least partially below an upper end of the engine, a pair of vertically extending plenum chambers communicating with the combustion chambers in the cylinder banks and with the induction passage, and a plurality of intake runners extending from each of the plenum chambers to intake passages that communicate with respective combustion chambers formed in the cylinder banks, and at least a portion of each runner and at least a portion of each plenum chamber being disposed within the valley.