What is the difference between DOHC and SOHC?

[AnnaMarie]

Engine DOHC and SOHC have the following main differences: 1. SOHC: Single Overhead Camshaft performs well in city driving with strong low-end torque, fuel efficiency, simple structure, low manufacturing cost, and low maintenance cost. However, it lacks sufficient power reserve at high speeds. 2. DOHC: Double Overhead Camshaft delivers strong high-end power, high emission efficiency, and is suitable for high-speed driving. It has a complex structure, high manufacturing cost, and high maintenance expenses. Here is an introduction to DOHC and SOHC: 1. SOHC engine refers to an intake system that uses a single overhead camshaft, meaning one intake valve and one exhaust valve. 2. 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).