Four-stroke piston engine

Gasoline engine with single overhead camshaft having duel exhaus

High power density, low emission internal combustion engine

Intake and exhaust valve system

Intake/exhaust valve

Internal combustion engine

Internal combustion engine

Internal combustion engine having diverter valve and separate pa

Internal combustion engines

Internal combustion engines

Internal-combustion engine with concentric, annular intake and e

Method of producing a powerful and efficient internal...

Multiple concentric intake/exhaust valve system for an internal

Partitioned poppet valve mechanism seprating inlet and exhaust t

Poppet valve and engine using same

Poppet valve and engine using same

Poppet valve assembly with apertures

Rotary distribution system internal combustion engine

Rotary-poppet valve internal combustion engine

Stratified combustion engine