Patent ID: 8677749

Claim:
An internal combustion engine, comprising: a cylinder wall; a crankshaft; an exhaust piston disposed in the cylinder wall and coupled to the crankshaft via a connecting rod wherein the exhaust piston reciprocates within the cylinder wall when the crankshaft rotates; a combustion chamber delimited at least by a top of the exhaust piston and the cylinder; a plurality of primary exhaust ports defined in the cylinder wall; a plurality of secondary exhaust ports defined in the cylinder wall wherein the pluralities of primary and secondary exhaust ports are covered and uncovered by the exhaust piston as the exhaust piston reciprocates within the cylinder wall; and a first turbine fluidly coupled to the plurality of primary exhaust ports and fluidly decoupled from the plurality of secondary exhaust ports wherein the plurality of primary exhaust ports is covered and uncovered by the same exhaust piston that covers and uncovers the plurality of secondary exhaust ports.