How to choose a camshaft
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(→Intake centerline (ICL)) |
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===Intake centerline (ICL)=== | ===Intake centerline (ICL)=== | ||
| − | This number represents where the intake lobe's peak lift occurs in relation to crankshaft rotation. It is the point of maximum lift of the intake lobe and is measured in ''crankshaft'' degrees. A cam ground "straight up" | + | This number represents where the intake lobe's peak lift occurs in relation to crankshaft rotation. It is the point of maximum lift of the intake lobe and is measured in ''crankshaft'' degrees. A cam ground "straight up" means that the exhaust lobe's peak lift will happen at the same amount of degrees before top dead center, as the intake valve will peak after top dead center if the intake and exhaust durations are the same. ICL is machined into the cam. When cam manufacturers machine the snout of the cam for the cam sprocket, they will drill the holes with the cam slightly advanced, retarded, or straight up. When installed with stock components, the ICL can't be altered. |
Aftermarket timing set gears often have provisions for altering the cam timing by advancing or retarding the cam position in relationship to the crankshaft position. If the cam card shows the LSA is the same as ICL, the cam is said to be ground "straight up." If the ICL is ''less'' than the LSA, it is said to be ground "advanced". If ICL is more than the LSA, the cam is said to be ground "retarded". It is much more common to see a cam ground advanced or straight up than retarded. | Aftermarket timing set gears often have provisions for altering the cam timing by advancing or retarding the cam position in relationship to the crankshaft position. If the cam card shows the LSA is the same as ICL, the cam is said to be ground "straight up." If the ICL is ''less'' than the LSA, it is said to be ground "advanced". If ICL is more than the LSA, the cam is said to be ground "retarded". It is much more common to see a cam ground advanced or straight up than retarded. | ||
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