Degreeing cam

[Gaz64]

Originally Posted by eschaider

You guys are missing it.

Cam timing figures at 0.050 Valve Lift are measured at the valve not at the cam. If you measure at the cam you have to factor for the rocker ratio. Additionally if you use a different rocker ratio than the cam specs were developed with, you need to translate all the cam phasing specs to reflect the rocker ratio you are actually using.

If you choose to degree at the cam instead of the valve anyhow, then you have to use the centerline approach where you come within say 0.100" of max lift and record the crank position both before and after the max lift point. The cam's current centerline phasing will be exactly between those two figures.

Ed

.050 figures are lifter rise, not valve lift, never has been valve lift.