V-type vertical engine

Abstract

Disclosed is a V-type vertical engine which is particularly advantageous for use as an outboard marine engine. This engine typically comprises a crank shaft extending vertically; a pair of cylinder banks; intake ports which are located adjacent to the internal sides of the cylinder banks; intake tubes which are connected to the intake ports and, at least in part thereof, extend along a central line between the two cylinder banks away from a crank shaft of the engine; a carburetor unit including at least one carburetor having a pair of intake passages which communicate with the intake ports belonging to different ones of the cylinder banks and a single float chamber which is common to both the intake passages; exhaust ports which are located adjacent to the external sides of the cylinder banks; and exhaust passages which, at least in part thereof, extend along a cylinder axial line towards the crank case. The cooling water for the engine is introduced into the water jackets of the cylinder block and the cylinder heads from the bottom end of the engine and expelled from the top ends of the cylinder banks by way of a pair of tubes which are joined into a thermostat valve chamber. The thermostat chamber is further connected to a central conduit which extends vertically between the two cylinder banks and conducts the cooling water from the thermostat chamber to the surrounding water.