A combustible mixture is compressed in the crankcase of a four-stroke cycle engine and forced into a boost plenum which houses the camshaft. The compressed mixture is metered by a throttle to intake valves of the engine. The engine is constructed from identical engine block elements rotated and joined to enclose centrally disposed crankcase and common boost plenum with the cylinders horizontally opposed.
Keywords: efficient horsepower lightweight interchangeable torque compact dependable adaptable
