What is the advantage of a double overhead cam?
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.
Which is better single or dual overhead cam?
A DOHC, four valves per cylinder configuration allows better airflow at high engine speeds, resulting in better top end power. However, at higher engine speeds, a DOHC setup with its higher valvetrain mass and as many valves per cylinder will develop higher peak torque and horsepower.
Is DOHC faster than SOHC?
One of the camshafts operates the exhaust valves while the other operates the intake valves. The extra camshafts in every cylinder row enable the valves to open and close with precision. The DOHC engine produces more power and is more efficient than the SOHC engines.
Can timing affect compression?
The only way ignition timing can affect compression is if is way too early preventing full compression. But that is well overridden by the pressure increase due to combustion. Too early and engine damage is likely.
How many camshafts are in a double overhead camshaft engine?
A double overhead camshaft (DOHC or “twin-cam”) engine has two camshafts per bank of the cylinder head, one for the intake valves and the other for the exhaust valves. Therefore there are two camshafts for a straight engine and a total of four camshafts for a V engine or a flat engine.
What are the advantages of dual overhead cams?
The main benefit of dual overhead cams is that they allow an engine to have four valves per cylinder. Each camshaft operates two of the valves, one camshaft handles the intake valves, and one handles the exhaust valves. Having four valves per cylinder gives an engine several advantages. By…
How are the clearances set on a double overhead cam?
However, on many vintage cars with single and double overhead cams, along with several late-model Toyotas and many motorcycles, the cam lobes push “bucket” tappets down over the valve stems, and shims of the appropriate thicknesses are employed between the tappets and the tops of each valve stem to set the clearances.
Which is the oldest configuration of overhead camshaft engine?
The oldest configuration of overhead camshaft engine is the single overhead cam or single cam design. A SOHC engine has one camshaft per bank of cylinders, therefore a straight engine has a total of one camshaft.