What is the difference between DOHC and SOHC engines?

[LeMaximus]

The main differences between DOHC and SOHC engines: SOHC: Single Overhead Camshaft performs well in urban driving with strong low-end torque, fuel efficiency, simple structure, low manufacturing cost, and low maintenance expenses. However, it lacks sufficient power reserve at high speeds. DOHC: Double Overhead Camshaft delivers strong high-end power, high emission efficiency, and is suitable for high-speed driving. It features a complex structure, high manufacturing cost, and expensive maintenance. Here is an introduction about DOHC and SOHC: SOHC engine refers to an intake system that uses a single overhead camshaft, meaning one intake valve and one exhaust valve. DOHC engine refers to an intake system that uses double overhead camshafts, typically with multiple valves per cylinder, commonly 4 valves (i.e., 2 intake valves and 2 exhaust valves).