DoHCs

DoHCs, or Double Overhead Camshafts, represent a specific design feature in internal combustion engines. This configuration involves having two camshafts located in the cylinder head, one for operating the intake valves and another for operating the exhaust valves. Each camshaft typically has its own set of lobes that act directly on the valves or through rocker arms. This contrasts with Single Overhead Camshaft (SOHC) engines, which use only one camshaft to control both intake and exhaust valves, and Overhead Valve (OHV) engines, where the camshaft is located in the engine block.

The primary advantage of a DoHC setup is improved valve control. With separate camshafts for intake and exhaust, the timing and lift of each valve can be optimized independently. This allows for more precise control over the flow of air-fuel mixture into the cylinder and exhaust gases out, leading to potentially better performance, increased fuel efficiency, and reduced emissions. DoHC designs are common in modern high-performance engines and many everyday vehicles due to their efficiency and power potential. The complexity of the valvetrain can be slightly higher compared to SOHC or OHV designs, but the benefits often outweigh this.