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In internal combustion engines with pistons, the camshaft is used to operate poppet valves.
It consists of a cylindrical rod running the length of the cylinder bank with a number of oblong lobes protruding from it, one for each valve.
The cam lobes force the valves open by pressing on the valve, or on some intermediate mechanism, as they rotate.
Another option was to use a triple eccentric with connecting rods; these were used on certain W. Bentley-designed engines and also on the Leyland Eight.
Many performance engine builders gauge a race profile's aggressiveness by looking at the duration at .020", .050" and .200".
The .020" number determines how responsive the motor will be and how much low end torque the motor will make.
Since the valves control the flow of the air/fuel mixture intake and exhaust gases, they must be opened and closed at the appropriate time during the stroke of the piston.
For this reason, the camshaft is connected to the crankshaft either directly, via a gear mechanism, or indirectly via a belt or chain called a timing belt or timing chain.