What effect does roller diameter have on duration/lift?
What effect does roller diameter have on duration/lift? So I have a camshaft that was designed for a .700" diameter roller. I decide to run a lifter with a .750" diameter roller. What change in duration and lift will result in this change? Here are the BTR camshaft numbers:
235/252 .629"/.600" 119+5
It is one of their blower cams for a LSA. Is there an easy way to figure this out?
235/252 .629"/.600" 119+5
It is one of their blower cams for a LSA. Is there an easy way to figure this out?
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The effect is VERY slight but the duration will be VERY SLIGHTLY greater because the "side" of the lobe, as it's on the ramp, will be pushing up on the roller sooner.
It would be possible to "figure out" exactly how much it changes it if you knew the cam base circle. You could make an educated guess at that and probably be PLENTY close enough; like within acoupla tenths of a ° or closer. It won't ever be more than a ° or 2 though. A fun trigonometry exercise but not much application to the RW.
As GAtsma said, no effect on lift.
It would be possible to "figure out" exactly how much it changes it if you knew the cam base circle. You could make an educated guess at that and probably be PLENTY close enough; like within acoupla tenths of a ° or closer. It won't ever be more than a ° or 2 though. A fun trigonometry exercise but not much application to the RW.
As GAtsma said, no effect on lift.
Here’s a great thread on this subject. Racer 7088 is Erik from HPR.
https://ls1tech.com/forums/advanced-...diameters.html
https://ls1tech.com/forums/advanced-...diameters.html
