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Cam lobe profile

Started by b5blue, May 21, 2025, 09:46:03 AM

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b5blue

May 21, 2025, 09:46:03 AM
  Cam lobe profile varies for many reasons yet all must fit inside the cam's bearing diameter regardless. A very high lift cam must then have a smaller "off-lobe" radius or are the bearings so big it's not a factor? (B-R/B engines.)
  I'm just considering if any effect on push rod length?  :scratchchin: 

cdr

#1
May 21, 2025, 07:03:52 PM
Yes a smaller base circle would require a longer pushrod, BUT that would be a VERY high lift race camshaft 
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Kern Dog

#2
May 21, 2025, 08:12:17 PM
Yeah, what B-5 refers to as off lobe radius is commonly called the base circle.
CDR made a good point. The lift would have to be HUGE to be higher than even the smallest journal. If that were needed, the cam's base circle would be smaller to allow it. At this point, custom length pushrods is a very small part of the overall project. You'd have insane spring rates and installed height to control it all.
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