What does the abbreviation OHV stand for when referring to a type of engine?

The abbreviation OHV stands for "Overhead Valve," which indicates a specific engine design configuration. In an OHV engine, the valves are positioned in the cylinder head, rather than in the engine block. This design allows for more efficient airflow into and out of the combustion chamber, which can improve engine performance and efficiency.

The overhead valve configuration is significant because it generally allows for a more compact engine design and can contribute to the engine's ability to produce higher horsepower while maintaining better fuel efficiency. It also enables higher engine speeds and better thermal management compared to other configurations, such as pushrod engines.

Understanding this terminology is crucial for anyone involved in small engine maintenance and repair, as it affects how the engine operates and is serviced. Other terms in the options presented do not represent standard engine configurations or commonly recognized industry terms, making "overhead valve" the correct answer.