Patent ID: 8794218

Claim:
An internal combustion engine, comprising: a first cylinder having a first piston, a first intake port, and a first exhaust port, the first cylinder being a fuel burning cylinder that receives fuel for compression and ignition within the first cylinder; a second cylinder having a second piston, a second intake port, and a second exhaust port; a third cylinder having a third piston, a third intake port, and a third exhaust port; a fourth cylinder having a fourth piston, a fourth intake port, and a fourth exhaust port, the fourth cylinder being a fuel burning cylinder that receives fuel for compression and ignition within the fourth cylinder; a first routing member configured to route exhaust from the first exhaust port to the second intake port; a second routing member configured to route exhaust from the first exhaust port to the third intake port; a third routing member configured to route exhaust from the fourth exhaust port to the second intake port; and a fourth routing member configured to route exhaust from the fourth exhaust port to the third intake port, wherein the second cylinder is a non-fuel burning cylinder configured to receive exhaust through the second intake port to drive the second piston without compressing and igniting the exhaust within the second cylinder, and the third cylinder is a non-fuel burning cylinder configured to receive exhaust through the third intake port to drive the third piston without compressing and igniting the exhaust within the third cylinder.