Patent ID: 6408803
Filing Date: 2002-06-25
Classification: F01P,F02B

Abstract:
A replacement cylinder for use in providing liquid cooling to an air cooled internal combustion engine of the type having one or more piston cylinders exterior to a crankcase block, said replacement cylinder comprising:a unitary casting including a cylinder head portion, intake and exhaust ports and spark plug openings in said head portion; said cylinder head having coolant passages therein; and a double walled jacket defining an annular coolant cavity having an open end and an opposite end closed by a head portion having intake and exhaust ports, said head portion including coolant passages in fluidic communication with said annular coolant cavity, a coolant inlet and a coolant outlet on said jacket for circulating coolant through said coolant cavity and said coolant passages; a flow gate near said coolant inlet for diverting a substantial portion of coolant flow from said inlet into said coolant passages and the balance of the coolant flow into said coolant cavity; and a cylinder sleeve fitted to said open end of said double walled jacket of said unitary casting.