Patent ID: 7152572

Claim:
An internal combustion engine comprising a piston reciprocating in a cylinder; air inlet means communicating with the cylinder; exhaust means communicating with the cylinder; a substantially cylindrical indirect combustion chamber communicating with the cylinder comprising a near end and a far end in relation to the piston; a transfer orifice communicating with the cylinder and the combustion chamber at its near end; spark ignition means located at the far end of the combustion chamber; a fuel injector communicating with the combustion chamber; a controller to control the fuel injection process and spark ignition event; characterised in that the transfer orifice is adapted to deliver a jet of air into the combustion chamber during the compression stroke of the piston forcing air movement around the periphery of the combustion chamber in helical swirl motion in which the jet of air has a tangential velocity component around the combustion chamber and an axial velocity component along the combustion chamber, the axial velocity component being directed away from the near end and towards the far end, and in that the fuel injector is adapted to deliver some fuel into the said jet of air within the chamber in a direction which also enables a spark ignitable mixture to form in the gas arriving at the spark ignition means.