Now, as far as the Lobe Separation Angle (LSA), that's how wide the angle is between the centerline of the intake lobe compared to the exhaust lobe. 200', etc.) the amount of duration will become less. As the point of reference increases in lift (.050' vs. 050' has been removed from the measurement. This number will always be smaller because, for lack of a better way to explain it, the amount of duration from. 050' from being closed against the valve seat after it goes through the entire lift cycle. 050' away from the valve seat, and once again when it's. 050' is the same thing, just measure from the time the valve is opened, is.

006', goes through the entire lift cycle (.480') then begins to close and is once again. I.E., the crankshaft literally spins 280* from the time the valve is open. 006' away from being rested back down on the seat, based on crankshaft rotation, measured in degrees. The advertised duration is how long the valve is open from the time it's. Lift at the valve using 1.5:1 ratio rocker arms =. It's actually the cam that's in my car which is a Competition Camshafts (aka Comp Cams) Magnum 280.

Just for simplicity I'm going to use a single pattern cam, meaning the intake and exhaust lobes are identical in lift and duration. I'll give you a brief example, then a link to a site which will do a better job of teaching you the basics of a camshaft and what all of the numbers mean. The lobe separation angle is measured in degrees of camshaft rotation, which is half that of the crankshaft, as is the amount of advance or retard that's ground into the cam. The duration (how long) a valve is open is measured based on crankshaft rotation, which is twice as fast as the camshaft. Not to sound critical, but you really have to read about camshafts and how they work, how the numbers are figured and what they mean.

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