Way to go Terry---Lifter diameter is dictated by the "ramp angle"--
First [FOT] rookie question-TR-4 built 1968--it as a positraction rear--
any easy way to ID it Detriot-or Salisbury? Thanks, John Hagen
On Sun, Feb 6, 2011 at 5:34 PM, Enquiries Road & Track wrote:
> the problem is mostly the acceleration rate (profile) of the cam, not
> the
> max lift per-se. as the cam rotates, the shape of cam lobe is designed
> not
> to dig into the edge of the lifter (or vice versa). this is called
> edge-riding and is a very common problem when upgrading modern OHC
> engines
> where everything is designed to work perfectly, with zero room for
> change.
>
> to check this out, put some engineers blue on the face of the lifter
> and
> rotate the cam. it is OK, if a thin blue edge remains around the
> circumference of the lifter. if the cam wipes it off totally, thats
> not
> right. the cam and the lifter are scraping (not riding). eventually,
> the cam
> wears the sharp edge off the lifter and/or the cam lobe wears away;
> neither
> being good
>
> the cam designer can mathematically determine the profile from the
> lifter
> diameter, thats why its his first question
>
> Terry O'Beirne
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