Cam Valve Lifters at Evelyn Council blog

Cam Valve Lifters. The parts of an overhead valve (ohv) engine that follow the curves of the camshaft are referred to as “lifters” in the past. Lifters sit inside an engine and follow the lobe profile of a camshaft, and their movements are what open and close the valves. The size and shape of the cam lobe under the lifter (multiplied by the ratio of the rocker arms) determines valve lift and duration. Sohc are higher performance and lighter (and so typically have a higher rev range) than underhead cams with lifters. In sohc (single overhead cam) setups you'll see a single camshaft driving. It sits on the camshaft and transfers the motions of the cam lobe up through the pushrods and rockers to open and close the valves. A roller lifter has a wheel on the bottom that rides on the camshaft, and this wheel provides the advantage of reducing friction, wear, and allows for aggressive camshaft profiles to be used. One reason is that roller lifters have less friction on the camshaft, which makes it easier for the cam to spin. All of these technologies are available for use on flat tappet. The basic function of a valve lifter is pretty simple.

The basic function of a valve lifter is pretty simple. Sohc are higher performance and lighter (and so typically have a higher rev range) than underhead cams with lifters. In sohc (single overhead cam) setups you'll see a single camshaft driving. Lifters sit inside an engine and follow the lobe profile of a camshaft, and their movements are what open and close the valves. The parts of an overhead valve (ohv) engine that follow the curves of the camshaft are referred to as “lifters” in the past. One reason is that roller lifters have less friction on the camshaft, which makes it easier for the cam to spin. All of these technologies are available for use on flat tappet. A roller lifter has a wheel on the bottom that rides on the camshaft, and this wheel provides the advantage of reducing friction, wear, and allows for aggressive camshaft profiles to be used. It sits on the camshaft and transfers the motions of the cam lobe up through the pushrods and rockers to open and close the valves. The size and shape of the cam lobe under the lifter (multiplied by the ratio of the rocker arms) determines valve lift and duration.

Valve Lifter Technology

Cam Valve Lifters The size and shape of the cam lobe under the lifter (multiplied by the ratio of the rocker arms) determines valve lift and duration. All of these technologies are available for use on flat tappet. The parts of an overhead valve (ohv) engine that follow the curves of the camshaft are referred to as “lifters” in the past. Sohc are higher performance and lighter (and so typically have a higher rev range) than underhead cams with lifters. In sohc (single overhead cam) setups you'll see a single camshaft driving. It sits on the camshaft and transfers the motions of the cam lobe up through the pushrods and rockers to open and close the valves. The size and shape of the cam lobe under the lifter (multiplied by the ratio of the rocker arms) determines valve lift and duration. A roller lifter has a wheel on the bottom that rides on the camshaft, and this wheel provides the advantage of reducing friction, wear, and allows for aggressive camshaft profiles to be used. The basic function of a valve lifter is pretty simple. One reason is that roller lifters have less friction on the camshaft, which makes it easier for the cam to spin. Lifters sit inside an engine and follow the lobe profile of a camshaft, and their movements are what open and close the valves.