Performance Engine Components 2007 Manual Standard camshafts offer a good compromise between the daily requirerements from an automotive engine: sustained high speed on open roads, smooth engine idle at low rpm and low exhaust emissions. If the importance of one or more of these parameters is reduced, the camshaft can be designed to function better in the remaining parameters. Racing camshafts offer a substantial power increase at high rpm. Engine idle at low rpm is not possible anymore. Sport camshafts
inrease the valve lift, valve opening duration and the inlet/outlet valve overlap. This improves the cylinder filling at high rpm. Engine idle at low rpm becomes erratic, due to the mixing of intake air and exhaust gasses. (see: “Which camshafts are good for Streettuning?” and “What is the Swingboost effect?download : PDF - Performance Engine Components 2007
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