In an engine that approximates the Otto cycle (Fig.

Chapter 20, Problem 20.21

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In an engine that approximates the Otto cycle (Fig. 20-8),gasoline vapor must be ignited at the end of the cylindersadiabatic compression by the spark from a spark plug. Theignition temperature of 87-octane gasoline vapor is about430 C and, assuming that the working gas is diatomic andenters the cylinder at 25 C, determine the maximumcompression ratio of the engine.

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