Factory roller cam questions
#1
Factory roller cam questions
Has anyone disassembled a factory hydraulic roller lifter from a vortec? I disassembled two and found only a flat disk inside. Is that all that is inside a stock GM hydraulic lifter? What is the correct way to get the darn thing back together? I put these in the lifter bore and cranked down on a stock pushrod until the cup was below the groove and installed the retaining spring.
How does one identify the lift AND duration of an unknown cam? Using a degree wheel? Does anyone have a degree wheel and dial indicater they want to sell?
What would be the correct pushrod length for a vortec hydraulic roller cam? Compcams says 7.3.
How does one identify the lift AND duration of an unknown cam? Using a degree wheel? Does anyone have a degree wheel and dial indicater they want to sell?
What would be the correct pushrod length for a vortec hydraulic roller cam? Compcams says 7.3.
#2
Not sure about the lifters. The LT1 lifters I've had open had the metering disc.
As for plotting the lift curve of an unknown cam, lacking a CMM with a C-Axis, here's what I've done:
With a handful of lobe lift and degree comparisons, it's fairly easy to get a handle on the lobe profile. LSA, duration on both lobes, and peak lifts are determined, and a little research can often reveal exactly what you have. If you pay a little attention at the transiston from the base to the ramp, you can usually determine if it was intended to be a hydraulic or solid grind.
As for plotting the lift curve of an unknown cam, lacking a CMM with a C-Axis, here's what I've done:
With a handful of lobe lift and degree comparisons, it's fairly easy to get a handle on the lobe profile. LSA, duration on both lobes, and peak lifts are determined, and a little research can often reveal exactly what you have. If you pay a little attention at the transiston from the base to the ramp, you can usually determine if it was intended to be a hydraulic or solid grind.
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