[Fot] Zinc Additive.

[n197tr4 at cs.com]

 Use of bronze guides is or can be an issue here.

ESPECIALLY those not properly clearanced.

It ALSO seems that cast iron guides are 'slippery' while bronze can create
added friction and wear.

We dont use bronze guides anymore.









-----Original Message-----
From: Robert M. Lang <lang at isis.mit.edu>
To: Ruffner, James A *HS <JAR7U at hscmail.mcc.virginia.edu>
Cc: 6pack <6pack at autox.team.net>; fot <fot at autox.team.net>; REK46
<REK46 at aol.com>
Sent: Wed, Nov 2, 2011 4:04 pm
Subject: Re: [6pack] [Fot]  Zinc Additive.


Google "ZDDP"

You'll get so much information, your head will explode.

Executive summary: yes, there is a correlation. The summary of the
correlation is that without ZDDP in break-in, cam failure is certain.
THere may be supporting data that without ZDDP during normal use that
failure probable - all things considered.

But there are other factors for excessive cam wear and you need to account
for ALL of them. Material surface hardness, proper materials in the first
place, proper break-in, proper valve spring pressure, proper rocker
geometry and so forth.

regards,
rml
---------------------------------------------------------------------------
Bob Lang              Triumph TR6!!            |  This space for rent
Former NER Solo Chair                          |
Voice:617-253-7438                             |  Cell: 339-927-4489
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On Wed, 2 Nov 2011, Ruffner, James A *HS wrote:

> Does anyone know what the correlation is between cam wear and the zinc
> additive?  I do not remember ever having heard of this.
> ________________________________________
> From: 6pack-bounces at autox.team.net [6pack-bounces at autox.team.net] On Behalf
Of
> Irv Korey [emanteno at comcast.net]
> Sent: Monday, October 31, 2011 7:38 PM
> To: DJFidler at rogers.com
> Cc: 6pack at autox.team.net; REK46 at aol.com; fot at autox.team.net
> Subject: Re: [6pack] [Fot]  Zinc Additive.
>
> On Mon, Oct 31, 2011 at 4:36 PM, David Fidler <DJFidler at rogers.com> wrote:
>
>> Brad Penn is still sold under the Kendall GR-1 name in Canada, available
>> from Crescent Oil in Hamilton, ON.
>>
>
>
> According to the Brad Penn website, the Kendall name was sold to a 3rd
> party when the refinery was sold. Because of that, the oil from that
> refinery had to be
> re-named, and they came up with Brad Penn. Kendall GR-1 may still be
> available, but unless they are buying it from the company that
> owns Brad Penn, it isn't the same oil that it used to be. NFI
>
> http://www.penngrade1.com/History.aspx
>
> Irv Korey
> 74 TR6 CF22767U
> Highland Park, IL
>
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>
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