Overhead Cam Engine Diagram

The cam actuates rocker arms that press down on the valves opening them.

Overhead cam engine diagram. In overhead cam engines whether its a v configuration or a straight configuration the cam which actuates the valves is located directly on top of said valves. Generally engines with dual overhead camshafts dohc are higher performance engines they produce more power and can run at higher speeds. Adding vvt to the hemi engine required a new block that had three additional oil passages and an extended front cam bearing that allowed them to supply oil to the cam phaser through the front journal. The front of the block above the mains was moved out by about 0600 so it ended up flush with the side rails on the timing cover.

So if it is an inline 4 cylinder or inline 6 cylinder engine it will have one cam. Dohc means double over head cam. This arrangement denotes an engine with one cam per head. The cam rotates and the lobes push down on the valve stems causing the valves to open and then close when the lobe rotates away.

If it is a v 6 or v 8 it will have two cams one for each head. The parts of an overhead camshaft engine camshaft the camshaft has pear shaped lobes which actuate the valves usually one inlet and one exhaust valve for each cylinder. Piston the piston is fitted with steel rings which fill the gap between it and the cylinder wall. The camshaft in an ohv engine is located in the engine block.

An overhead valve ohv engine sometimes called a pushrod engine is a piston engine whose valves are located in the cylinder head above the combustion chamber. Specifications power curves service manuals owners manuals and diagrams for subaru industrial products industry leading ex series overhead cam engines. A dohc engine design is often called twin cam or dual cam. Single overhead camshaft sohc engines have one camshaft per bank of cylinders.

One camshaft operates intake valves while another camshaft controls exhaust valves on the opposite side. The valves in the overlapped position where both the intake and exhaust rocker arms overhang the cam lobes by equal amounts. The camshafts have the job of opening the valves that let air into and exhaust out of the engine. On a single overhead cam engine the intake and exhaust lobes on the cam for each cylinder form a v and in the overlapped position the rocker arms hang over into the v by equal amounts.

The majority of modern cars have a dohc engine. An overhead camshaft ohc engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. A typical dohc engine has two camshafts and four valves per cylinder like the one in this animation.