Abstract: A variable angle cam-drive engine in which the torque output generated at a given engine speed (as represented by, for example, piston reciprocation frequency) can be varied by changing the operating angle of cam mechanisms in a power conversion mechanism of the engine. A power conversion mechanism, having a plurality of cam mechanisms and a cam-angle mechanism, for use in a variable angle cam-drive engine that can vary the torque output generated at a given engine speed by changing the cam-angle of the plurality of cam mechanisms using the cam-angle mechanism.

Abstract: A cam-drive engine having one or more cylinder assemblies detachably affixed to an engine core that does not include a cylinder block per se. Each cylinder assembly can be attached to or detached from the engine core without the need for disassembly of the cylinder assembly unit. This allows cylinder assemblies to be easily removed or replaced for repair or cylinder assemblies to be easily added to an existing engine. The cylinder assemblies can include cylinder pressure and solenoid actuated intake and exhaust valves that facilitate attachment. The engine can further include a catalytic converter contained in a central hub proximate to the cylinder assemblies thereby facilitating rapid warm-up of the catalyst.