![]() The more valve area open to flow, the more power an engine can theoretically make. ![]() Lift and duration combined determine total open valve area-the space available for air and fuel to flow into and out of the combustion chamber. Duration is the amount of time a cam keeps a valve off of its seat, measured in degrees of crank rotation. Lift is the amount a cam lobe actually moves a valve off its seat and is measured in fractions of an inch. Lift and duration are the primary factors that determine a cam’s profile. We’re going to concentrate on the basics you’ll need to know to choose a good street cam, and later we’ll share with you the key information you’ll need to supply your sales rep when purchasing a cam. Camshaft theory is a complex subject that can take a book-length article to explain. The result was overcammed engines that sounded great and could crank serious top-end power, but were not very streetable and couldn’t idle to save their lives.īut thanks to modern cam technology, you can come pretty darn close to the Holy Grail of street bumpsticks-cams that make high rpm power, have good low-end torque and drivability, decent vacuum for power brakes, and that loping idle we all love. Not so long ago, the bigger is better philosophy reigned supreme regarding camshafts.
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