Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder head
Patent
1994-04-29
1995-04-11
Dolinar, Andrew M.
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder head
1231932, F02F 110
Patent
active
054048460
ABSTRACT:
Disclosed herein is a four-stroke engine comprising a block having an intermediate portion defining a cylindrical bore having an axis, a head end, and a crankcase end, a head end portion extending from the head end of the intermediate portion in integral one-piece relation thereto and including a planar valve seat surface extending at an acute angle to the axis of the cylindrical bore and having a valve seat with a center and a perimeter defined by a radius extending from the center, and a crankcase end portion extending from the crankcase end of the intermediate portion in integral one-piece relation thereto and including a partially cylindrical portion coaxially aligned with the cylindrical bore, and a recessed portion extending from the partially cylindrical portion and having a peripheral wall spaced at a distance greater than the radius from a line extending perpendicularly to the valve seat surface and from said valve seat center.
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Dolinar Andrew M.
Macy M.
Outboard Marine Corporation
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