[T3] ? Mystery of the Clacking Valves ?
Jim Adney
jadney at vwtype3.org
Sat May 14 10:01:11 PDT 2011
On 14 May 2011 at 10:37, Bobsnotch at aol.com wrote:
> Jim, most of today's modern engines have roller lifters, and cams designed
> to use them. This change to rollers basically eliminated the need for the
> ZZDP in the oil. Also, when talking to a GM tech (at the dealer), he said
> that by eliminating the ZZDP, the catalytic converter gets a longer life (the
> stuff inside it). This was the reason they were getting rid of their EOS
> (Engine Oil Supplement), which contains ZZDP.
The roller lifter explanation is also what I got from a co-worker
that I asked about this yesterday. I hadn't realized that this was
common today. It makes sense, but that sure leaves a LOT of older
cars out there SOL.
> I think there are a couple of people working with either roller cams and
> lifters , or ceramic lifters for our engines. Jake Raby is one of the few
> that I know of, as he's been dabbling in both.
If would be great if ceramics could fix this. I hadn't thought of
that. There are companies that do ceramic coatings to ordinary metal
parts, but I would expect this to be a pretty hard thing to get to
work right.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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