Final answer:
Air-cooled engines are seldom used in passenger cars because they are less efficient at dissipating heat compared to water-cooled engines.
Step-by-step explanation:
Cooled engines that are seldom used in passenger cars are air-cooled engines. Air-cooled engines rely on circulating air to cool the engine, typically using cooling fins or a fan to dissipate heat. In contrast, water-cooled engines use a liquid coolant, such as water or a mixture of water and antifreeze, to transfer heat away from the engine.
One example of an air-cooled engine is the Volkswagen Beetle, which used an air-cooled flat-four engine. The engine design allowed for simplicity, reduced weight, and easier maintenance. However, air-cooled engines tend to be less efficient at dissipating heat, which is why they are seldom used in passenger cars today.
In summary, air-cooled engines are seldom used in passenger cars because they are less efficient at dissipating heat compared to water-cooled engines.