Which statement is NOT true of air-cooled engines?

Which statement is NOT true of air-cooled engines?

• A. They maintain temperature better than liquid-cooled engines
• B. They are typically lighter than liquid-cooled engines
• C. They require no radiator
• D. They can be simpler with fewer components

Answer: (A)

Engine cooling hinges on how effectively heat is removed from the engine to keep it within a safe operating range. Air-cooled engines rely on fins and direct airflow to shed heat, so the cooling rate depends on speed, air temperature, and ambient conditions. This makes temperature control more variable, with hotter spots possible under heavy load or high ambient temperatures. Liquid-cooled systems use a closed coolant loop with a thermostat and radiator, which helps regulate and stabilize engine temperature across different operating conditions. Because of that, air-cooled engines do not maintain temperature better than liquid-cooled engines. The other statements reflect common traits of air-cooled designs: no radiator is needed, they can be simpler with fewer components, and they are typically lighter.

Engine cooling hinges on how effectively heat is removed from the engine to keep it within a safe operating range. Air-cooled engines rely on fins and direct airflow to shed heat, so the cooling rate depends on speed, air temperature, and ambient conditions. This makes temperature control more variable, with hotter spots possible under heavy load or high ambient temperatures. Liquid-cooled systems use a closed coolant loop with a thermostat and radiator, which helps regulate and stabilize engine temperature across different operating conditions. Because of that, air-cooled engines do not maintain temperature better than liquid-cooled engines. The other statements reflect common traits of air-cooled designs: no radiator is needed, they can be simpler with fewer components, and they are typically lighter.