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The camshaft.
push rods connected to the camshaft
The camshaft ( it actuates the opening and closing of the cylinder head valves) has to be synchronized with the crankshaft (via the timing belt). Otherwise the pistons would hit and bend the valves. The spark plug firing has to be synchronized to the compression of the gas fuel mixture. The fuel injectors have to be synchronized to the opening of the intake valves.
Lobes on camshaft spaced correctly
The purpose of a camshaft is to open and close the intake and exaust valves.
Operate the valves.
The camshaft opens the valve via its Lobes, against the valve spring, to open. The valve springs closes the valve back.
the camshaft position sensor is used to synchronize the fuel injection system with the opening of the intake valves. It synchs the cam shaft location with the crankshaft location It can be in a distributor or it can read a tone wheel on the cam shaft.
The camshaft operates the valves on a 4 cycle engine.
A two-stroke engine does not have a cam or camshaft. Seeing there is no intake/exhaust valves it would be pointless to have a camshaft.
To open/close the intake/exhaust valves.
To open/close the intake/exhaust valves.