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The .020" number determines how responsive the motor will be and how much low end torque the motor will make.

Changing cam timing moves the overall power produced by the engine down or up the RPM scale.

The amount of change is very little (usually Duration specifications can often be misleading because manufacturers may select any lift point from which to advertise a camshaft's duration and sometimes will manipulate these numbers.

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.

In a two-stroke engine that uses a camshaft, each valve is opened once for every rotation of the crankshaft; in these engines, the camshaft rotates at the same speed as the crankshaft.

The relationship between the rotation of the camshaft and the rotation of the crankshaft is of critical importance.

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.

Billet Steel: When a high quality camshaft or low volume production is required, engine builders and camshaft manufacturers choose steel billet.

This is a much more time consuming process, and is generally more expensive than other methods. CNC lathes, CNC milling machines, and CNC camshaft grinders will be used during production.

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.

Direct drive using gears is unusual because of the cost.

With some early fuel injection systems, cams on the camshaft would operate the fuel injectors.