[Healeys] Cam wear question

[Bob Spidell]

Thanks to you and Kees.  Hopefully, my new gun-drilled DWR cam will 
address the lack of lubrication.  Can't do much about the ol' SUs 
washing oil off the bores, though.

Bob


On 12/26/2016 1:01 PM, Austin Healeys List wrote:
> 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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