[T3] ? Mystery of the Clacking Valves ?
Bobsnotch at aol.com
Bobsnotch at aol.com
Sat May 14 07:37:29 PDT 2011
In a message dated 5/13/2011 12:00:04 P.M. Eastern Daylight Time,
jadney at vwtype3.org writes:
The big question for me then, is what do modern engines do to their cams
to
make them survive? Their must be a solution that we should be able to take
advantage of, even if it means new cam and lifter technology.
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. No one is making engines using
"flat tappet" cams and lifters anymore. They do still carry it, but the
price tripled (used to be 9.99 a bottle, now it's 29.99 a bottle), and it's
marked "not for use in newer engines".
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.
Bob 65 Notch S with sunroof and IRS (Krusty)
71 Notch (Krunchy)
64 T-34 Ghia (Wolfie)
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