In an internal combustion engine when air is 1) …,, it is heated. With high compression ratios (17 to 1), the air is heated enough to 2) … and 3) … an injected fuel. Burning causes higher 4) …. The additional heat of burning fuel increases 5) …, forcing the piston 6) …. This represents the 7) … … stroke, which delivers a twisting action (torque) to the 8) …. At BC, the 9) … valve opens. The piston then rises on the 10) … stroke, pushing the burned exhaust mixture from the cylinder. The intake valve opens when the piston is at TC, completing one full cycle.

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