Ok - I will bit on this one. PTFE (Teflon) in oil is a no-no. It plugs
filters (why the FAA has ban it) and under high pressure and heat (cam
lobes) it sublimes to a fluorine that is abrasive. Also, PTFE can not
physically penetrate metal.
Using a dry film lubricant on other engine parts - ok on some parts. I
worked with Chrysler on their NASCAR motors as they started back into
NASCAR. They were looking for a dry film lubricant for the piston skirts.
They were having wear problems. A DFL was selected - would not tell me
which one - I think it was Teflon based -most candidate DFLs were. I have
tested many PTFE DFL's and they do not meet the requirements for space use.
As a side - In 2000, Nissan started putting DFL on the piston skirts of the
VG motors.
So, putting a DFL on the skirts does help. Putting a PTFE DFL on cam lobes
and lifters will only last minutes. Combustion chambers -seconds. Timing
gears - mmm for a while.
I work with DFLs everyday and have given their use in motors and other auto
applications some thought. The next time I build a motor I will most likely
put some DFL on the piston skirts. I need to run wear tests with DFLs in
motor oil to check compatibility with the binder system and insure a good
wear life.
I think the best think you can do for your Roadster motor is run a synthetic
motor oil. Stay away from snake oils- none improve wear life. Watch out
for vendor clams. We have lost satellites because of engineers believing
faults clams and not putting the product through the right tests.
Have a great Roadster day!! and watch your wallet:)
Phil
SEROC
-----Original Message-----
From: Bspark47@aol.com [mailto:Bspark47@aol.com]
Sent: Tuesday, June 25, 2002 2:19 PM
To: 9laser3@bright.net; datsun-roadsters@autox.team.net
Subject: Re: PolyDyn PD-14
That was my VERY first thought! And AJ Foyt seems happy to endorse just
about
any snake-oil that comes along ("Make sure you spell the name right on the
check, bub") so he isn't exactly the Shining Tower of Credibility anyway.
skeptically,
Bill
70
in a message dated 06/25/2002 11:52:14 AM Pacific Daylight Time,
9laser3@bright.net writes:
> Is anybody else reminded of Slick50? Since NHRA, CART, & NASCAR
rebuild
> engines every day, why would they car about long life?
>
> Paul
> ----- Original Message -----
> From: Bob Davis <rdavis4@cfl.rr.com>
> To: <datsun-roadsters@autox.team.net>
> Sent: Tuesday, June 25, 2002 7:38 AM
> Subject: Engine rebuild: coatings
>
>
> > I am in the process of rebuilding the engine for my racer and was
turned
> onto
> > a company that impregnates a polymer coating into/onto a variety of
engine
> > components. The most significant benefit being the reduction of engine
> heat
> > that effects and reduces the life of expensive parts. In the case of a
U20
> > engine it will virtually eliminate chain stretching. The information
> > originally came from Malvern Racing, David Webber,
www.malvernracing.com,
> a
> > long time Datsun/Nissan racer and race car preparer located in Virginia
> (by
> > the way, if you need forged pistons, Malvern has them in stock). The
web
> site
> > for the coating company is www.polydyn.com. In the message stream below
> are
> > quotes for doing a variety of engine components for the U20 engine.
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