Re: [T3] ? Mystery of the Clacking Valves ?

[Bobsnotch@aol.com]

In a message dated 5/13/2011 12:00:04 P.M. Eastern Daylight Time,  
jadney@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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