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The .050" number is used to estimate where peak power will occur, and the .200" number gives an estimate of the power potential.A secondary effect of increased duration can be increased overlap, which is the number of crankshaft degrees during which both intake and exhaust valves are off their seats.
In a four-stroke engine, the valves are opened only half as often; thus, two full rotations of the crankshaft occur for each rotation of the camshaft.Fibre gears have a short life span and must be replaced regularly, much like a timing belt.In some designs the camshaft also drives the distributor and the oil and fuel pumps.Direct drive using gears is unusual because of the cost.The frequently reversing torque caused by the slope of the cams tends to cause gear rattle which for an all-metal gear train requires further expense of a cam damper.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.
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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.
Other elements are added to the iron before casting to make the material more suitable for its application.