What does DOHC engine mean?
2 Answers
DOHC engine refers to a Double Overhead Camshaft engine, where the intake and exhaust valves are arranged on two separate camshafts. Its advantages include higher performance, better stability, and lower noise. Multi-valve engines allow for more complete combustion, enabling more fresh air to enter the engine, resulting in better emission efficiency. It can also adjust the opening and closing times of the intake and exhaust valves, providing ample torque at low engine speeds. Since DOHC engines eliminate the need for valve lifters and rocker arms, power loss is minimized, resulting in greater horsepower. Additionally, the valve overlap angle can be varied, leading to higher output power. Furthermore, the valves can be hydraulically controlled, eliminating the need for valve clearance adjustments. Even after extended mileage, there is no concern about power output decreasing due to changes in valve clearance.
DOHC engine refers to the double overhead camshaft design, simply put, there are two camshafts installed at the top of the engine, one specifically controls the intake valves, and the other manages the exhaust valves. This allows for more precise valve operation, improving the efficiency of air and fuel mixture, resulting in quicker response at high engine speeds and a smoother, quieter driving experience. I often see this type of engine in high-performance models, such as sports versions, which handle acceleration demands better while also improving fuel economy significantly. Compared to the single overhead camshaft (SOHC), it is easier to implement multi-valve layouts, such as a 16-valve system, but maintenance is slightly more complicated. If you are looking for a balance between fuel efficiency and power, DOHC is a practical choice, especially since modern cars are optimized very well.
