Abstract: An improved head assembly replacement for the Harley Davidson Motorcycle engine 20 adapted to utilize four valves per cylinder using push rods 50 without modification to the engine block, and maintaining the existing location and configuration for the mounting of the normal intake and exhaust systems. The standard rocker arms actuate the new dual intake and exhaust valves through a yoke 54 bridging each pair of valves. The exhaust valve and intake valve pairs are inclined at an included angle of 50 to 70 degrees in the plane of the engine crankshaft. The pushrods 50 remain in the standard position and the self-adjusting hydraulic tappets are retained.

Abstract: A simple two-stroke cycle engine can match the four-stroke cycle engine in efficiency and low exhaust emissions by incorporating a spring powered free-piston reciprocating within a sleeve valve to provide the required separation of gases during the exhaust and intake functions. The exhaust gas is displaced by the free-pistons' top surface, while simultaneously the bottom surface creates suction for the intake process during its upward stroke. These processes are completed in the interval between the effective end of the power stroke and the effective beginning of the compression stroke. The sleeve-valve controlled exhaust and intake ports of the cylinder are at the top and bottom extremities of the free-pistons' travel, respectively. The spring-powered travel of the free-piston to the top of the cylinder starts with the release by “blow-down” of the restraining combustion pressure at the start of opening of the exhaust ports.

Abstract: An improved head assembly for an internal combustion gasoline engine having an internal camshaft and push rod system which has a head (20) adapted to utilize four valves per cylinder using push rods (50) without modification to the engine block. The exhaust valves (36) are positioned longitudinally parallel with each cylinder and the inlet valves 38 are at a 10 to 18 degree angle from the engine cylinder centerline. The push rods (50) are so positioned as to allow contact with rocker arms (40) lifting the valves in sequence.

Abstract: Drive apparatus providing input gearing with an input shaft adapted to be connected to a single-shaft gas turbine, output gearing with an output shaft for connection to a load, a fluid coupling interconnecting the input and output gearing, and fluid supply apparatus for directing metered fluid to the fluid coupling to control the amount of coupling, which provides for the speed of the output shaft to be varied, thus enabling the powering of loads characteristically having high starting and uneven running torques, such as positive displacement pumps and compressors.