What does a dual overhead cam do?

Dual overhead cam engines are found in most modern vehicles today. They allow better airflow with less obstruction and are generally much more efficient engines than OHV or SOHC engines. Two camshafts operate 4 valves per cylinder, one separate camshaft for intake and exhaust valves.

How does an overhead camshaft work?

An overhead-cam (OHC) engine needs fewer parts to operate the valves. The cams act directly on bucket tappets or on short levers – known as fingers – which in turn act directly on the valve stems. The system dispenses with the extra weight and mechanical complexity of pushrods and rocker arms.

How do twin-cam engines work?

In a twin-cam engine, there are two camshafts inside the cylinder head, positioned above the cylinders. One camshaft is responsible for operating the intake valves and the other one operates the exhaust valves. The DOHC engine has several features unique to its design.

Are dual overhead cam engines good?

A DOHC, four valves per cylinder configuration allows better airflow at high engine speeds, resulting in better top end power. DOHC engines also allow the spark plug to be placed right in the middle of the combustion chamber which in turn promotes efficient combustion.

What is the advantage of overhead cam?

It is shown that the principal advantage of overhead camshafts is the increased natural frequency of the valve train. The resulting improved dynamic characteristics of the valve-actuating mechanism make it possible to design camshaft profiles which expand the useful operating range of high-speed engines.

Is DOHC same as VTEC?

DOHC has Cam profile change & timing adv, ignition and exhaust. SOHC VTEC = Timing and lift change in 1 step. Usually used to maximise low end torque. Because 1 cam controls both intake and exhaust valves, you cannot get good timing for high RPM power.

Is Twin Cam and DOHC the same?

Dual overhead camshaft (DOHC, also known as “twin-cam”.) engines have two camshafts per bank. The first production car to use an DOHC engine was built in 1910.

What are the advantages of overhead cam?

It is shown that the principal advantage of overhead camshafts is the increased natural frequency of the valve train. The resulting improved dynamic characteristics of the valve-actuating mechanism make it possible to design camshaft profiles which expand the useful operating range of high-speed engines.

What is the meaning of DOHC?

DOHC literally means Double Over Head Cams which means that the camshafts that actuate the intake and exhaust valves are located above the head (the part that contains t…he valves).

What is dual overhead camshaft?

A dual overhead camshaft (DOHC) valvetrain layout is characterised by two camshafts located within the cylinder head, one operating the intake valves and the other one operating the exhaust valves.

What is DOHC engine?

DOHC engine. DOHC is a synonym for Dual Overhead Cam, and this means you have two cams operating the exhaust and intake valves. The engine has one header but with two cam rods. Unlike the SOHC the DOHC has 4 valves with each camshaft per cylinder, operating either the exhaust valves or the intake valves.