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Standard camshaft profiles are designed by OEM engine designers to give
good torque output at low engine rpm's, a smooth idle and the best possible fuel
economy figures to help sell the car. All these features make a nice driveable
car but if you like to 'give it some' this type of profile will be dead
boring.
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Camshafts have two features. Lift, the distance the valve is lifted from
it's seat and duration, how long the valve is open. By juggling with these two
features a camshaft designer can make an engine tame enough for your Granny to
drive, or so wild that it won't idle, has no power below 10,000rpm and would
fail every emissions test on the planet.
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Lift Measurements
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Good camshaft design only comes with knowledge of the performance
requirements for a wide range of engine applications. TSR has that knowledge and
over the years has developed a range of camshafts able to get the best from road
or race engines, cat or non-cat equipped cars. Where appropriate we will
also recommend the products of other recognised experts in camshaft design.
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Duration Timing
This example of duration is for a 270º cam.
23+67=90+180(half cam rotation)=270
Note: Crank rotates 720º to camshaft 360º
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Vernier camshaft pulleys allow for fine adjustment of camshaft drive
position and timing, they are really worthwhile if the setup can be done on a
rolling road. Engines with two camshafts are best with adjustable drive
positioning on both camshafts.
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