In an engine that approximates the Otto cycle, gasoline vapor mustbe ignited at the end of the cylinder's adiabatic compression bythe spark from a spark plug.
The ignition temperatureof 87-octane gasoline vapor is about 430 ^\circ {\rm C} and, assumingthat the working gas is diatomic and enters the cylinderat 28^\circ C, determine the maximumcompression ratio of the engine.

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