[Healeys] Cam wear question

[Oudesluys]

A roller cam would suffer damage as well as the pressure on the cam 
surface is usually higher (2 radii), however it is a different kind of 
wear, with followers you have friction with rollers you have fatigue on 
the cam's surface. OHC engine camshafts usually wear less as there is 
considerable less mass to move (inertia). You only have the buckets, 
shims, valves and springs. For OHV heads there are rockers and push rods 
extra to it. This will lead to considerable larger forces on the cam 
shaft especially at high revs.
Kees Oudesluijs


Op 26-12-2016 om 0:32 schreef Bob Spidell:
> The cam we just pulled out of my BJ8 showed considerable wear, even 
> though I'd changed the oil regularly (I did get almost 120K on it).  I 
> can see how a roller cam would suffer less wear since there could be 
> considerably less friction on the lobes, but don't see why OHC cams 
> don't suffer similar wear since they apply similar pressure--minus the 
> lifter and pushrod weight--on either followers or the valves 
> directly.  What am I missing?
>
> Bob
>
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