In air-cooled engines, after heat is transferred to the cooling fins, where does it go?

• A. Heat is transferred to the surrounding air.
• B. Heat is stored in the crankcase.
• C. Heat is converted into electricity.
• D. Heat remains within the cylinder.

Answer: (C)

When heat moves into the cooling fins, the primary path is from the fins to the surrounding air. The fins have a large surface area, and as air flows over them, heat is carried away mainly by convection (and a bit by radiation). The crankcase may warm up temporarily, but it isn’t where the engine dumps heat long-term. Heat isn’t converted into electricity; electrical generation uses engine power to produce electricity, but that doesn’t remove heat from the engine. So the heat ultimately goes to the surrounding air.