Patent ID: 7685975

Claim:
An internal combustion engine twin power unit, comprising: a first cylinder; a second cylinder connected to the first cylinder via a crossover passage, wherein the crossover passage fluidly connects the first cylinder to the second cylinder; a rod assembly connected to a first piston and a second piston, wherein the rod assembly rigidly fixes the first piston and the second piston in a fixed spatial relation to each other, and wherein the first piston is disposed in the first cylinder and the second piston is disposed in the second cylinder; and a trunnion mount, the trunnion mount allowing the twin power unit to oscillate such that a centerline of the pistons is at all times aligned with a crank throw of a crankshaft, wherein an air-fuel mixture introduced in the first cylinder is transferred to the second cylinder via the crossover passage, and wherein an ignition in any cylinder causes combustion of the air-fuel mixture in both cylinders via the crossover passage.