Quote:
Originally Posted by Geoz1
...ZDDP does nothing for it. Once the cam and lifters go thru heat cycles, they have "mated". ZDDP is not necessary.
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The cam & lifters don't get hot enough to change their wear characteristics. The 'mating' you speak of is really a mechanical burnishing which smooths out the surface finish on the cam lobe and lifter foot.
Quote:
Originally Posted by Geoz1
ZDDP/Zinc protects cams and lifters.
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Yes, and all flat-tappet motors benefit from this. No reason to not use it in an air-cooled VW motor, especially for a buggy that's probably not driven so much.
Quote:
Originally Posted by Geoz1
Not sure what oil has to do with the 3 hole?
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Prior to a 1971, VW motors had their oil cooler mounted inside the fan shroud, right in the path of the cooling air for cylinder #3. This caused #3 to run hotter than the rest and could sometimes lead to exhaust valve failure. The revised oil cooler system used from '71-on resolved that problem.