[Healeys] Cam wear question

[Austin Healeys List]

Wear is caused by lack of lubricant rather than loading.

The Healey cam has no dedicated lubrication other than what flings off
the connecting rods so tends to run dry at start up. That old
cartridge filter doesn't help anything by taking up to ten seconds to
fill with oil.

Same theory applies to piston ring wear- carbs don't atomise the fuel
very well when cold and it washes the oil off the bores. EFI sends in
a fine spray at just the right dose and suddenly the engine lasts for
250k miles. Old rural delivery postal service cars here running on
propane would easily do 300k miles per rebuild because they rarely
turned the engine off and the fuel didn't contaminate the oil. Same
basic design layout as the Healey engine.

Andy.

On 12/26/16, Bob Spidell <bspidell at comcast.net> wrote:
> 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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