What does DOHC stand for in engine terminology?

What does DOHC stand for in engine terminology?

• A. Dual Overhead Cam
• B. Direct Overhead Cam
• C. Double Overhead Camshaft
• D. Dual Outer Cam

Answer: (A)

The main idea here is that this acronym describes how the engine’s valve train is arranged. DOHC means Dual Overhead Cam, indicating there are two camshafts located in the cylinder head to operate the valves—usually one camshaft for the intake valves and one for the exhaust valves. This setup allows more precise valve timing and often supports more valves per cylinder, which improves airflow and engine performance at higher speeds. The chosen wording is the most common way engineers and technicians refer to this arrangement, which is why it’s the best fit. “Direct Overhead Cam” isn’t a standard term in this context, and while “Double Overhead Camshaft” conveys the same idea, the typical shorthand used in manuals and exams is “Dual Overhead Cam.”

The main idea here is that this acronym describes how the engine’s valve train is arranged. DOHC means Dual Overhead Cam, indicating there are two camshafts located in the cylinder head to operate the valves—usually one camshaft for the intake valves and one for the exhaust valves. This setup allows more precise valve timing and often supports more valves per cylinder, which improves airflow and engine performance at higher speeds.

The chosen wording is the most common way engineers and technicians refer to this arrangement, which is why it’s the best fit. “Direct Overhead Cam” isn’t a standard term in this context, and while “Double Overhead Camshaft” conveys the same idea, the typical shorthand used in manuals and exams is “Dual Overhead Cam.”