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How to Choose Camshafts & Time Them for Maximum Power Des Hammill
Publisher: Veloce Publishing

By studying the lift profiles of all the camshafts and comparing them to the dyno data, I drew a few conclusions. As the camshaft spins, the lobes open and close the intake and exhaust valves in time with the motion of the piston. If you want to increase low-end torque to launch a heavy bike from a stop, or top-end horsepower for HARLEY-DAVIDSON CAMSgreater top speed, choosing the appropriate cam configuration will help you achieve the desired Nevertheless, these variables are critical in determining not only an engine's maximum power output but also the shape of its power curve. Which both the intake and exhaust valves are open at the same time. I intend to offer insight which will help in choosing a camshaft for yourself. The camshaft uses lobes (called cams) that push against the valves to open them as the camshaft rotates; springs on the valves return them to their closed position. Our mission is to serve our customers needs by offering the widest and latest selection of premium quality product at low prices while providing excellent customer service. Duration is the amount of time a valve is opened and is measured in crankshaft degrees. Overlap promotes cylinder scavenging at high RPM's which is crucial to power production in a naturally aspirated engine. The big power cams had a couple things in common: poor low-rpm performance and idle. Stand on the gas pedal at 2500 RPM, and the phaser advances the intake cam to provide maximum power. It turns out that there is a direct relationship between the shape of the cam lobes and the way the engine performs in different speed ranges. The key parts of any camshaft are the lobes. Ever wonder why hotrods sound like they do at idle?