[DeTomaso] ZDDP zinc oil additive

[Charles McCall]

1) There are documented cases of cams getting wiped after years of faithful
service, and the leading explanation is  that it's due to the lack of
scuffing protecting due to the lack of ZDDP
2) It isn't just monster springs, as Jack posts... there were several wiped
lobes in the MG community - cams from the 50's through 70's, and an MG-TD
doesn't have particularly strong valve springs... 

Charles McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness Across Europe"
http://www.poca.com/index.php/gallery/?g2_itemId=2323
-----Mensaje original-----
De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
nombre de JDeRyke at aol.com
Enviado el: viernes, 13 de marzo de 2009 6:07
Para: Fresnofinches at aol.com; detomaso at realbig.com
Asunto: Re: [DeTomaso] ZDDP zinc oil additive


In a message dated 3/12/09 9:40:37 PM, fresnofinches at aol.com writes:

> Most of what I have read on this issue deals with the need for the ZDDP on

> initial start-up of a new cam.? Without this lubrication in the early 
> break-in, cam lobes are ground flat.
> I have read nothing of the need for this ZDDP-rich oil for an older, 
> established engine.
> 
A good Dan Jones question. But it appears to me that the wear rate of brand 
new cams and lifters, WITH stiff racing valve springs that produce higher 
(sometimes. MUCH higher) pressures going over-the-nose of a cam lobe, is
really 
what causes the occasional lobe damage. This damage doesn't happen all the
time, 
and it likely won't happen in any case with a cam assembly thats aimed for
the 
street, with non-locomotive valve springs & reasonable lift rates. It's also

aimed squarely at flat-tappet cams; rollers- solid or hydraulic- are 
apparently unaffected. Dan can expound further- J Deryke


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