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Net Work done by the Gas per Cycle #8211; During the four strokes, W<sub>1</sub> and W<sub>2</sub> are the work done by the gas and W<sub>3</sub> and W<sub>4</sub> are the work done on the gas. Therefore, the net work performed by the engine, W = W<sub>1</sub> + W<sub>2</sub> #8211; W<sub>3</sub> #8211; W<sub>4</sub> = Area ABGE + Area BCHG #8211; Area CDFH #8211; Area ADEF = Area ABCD Thus, net work done by the engine during one cycle is equal to the area enclosed by the indicator diagram of the cycle.
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