RECENT DEVELOPMENT?!? Obviously not written by a German. Synthetic oil was
developed in the late 1930's and then used in WWII by the German Luftwaffe
(Air Force to those who don't know that term). They also developed
Synthetic Gas, Milk, and Butter (a crude margarine).
-----Original Message-----
From: owner-dakota-truck@buffnet.net
To: dakota-truck@buffnet.net
Subject: Re: DML: Synthetic Oil
fawcett@uism.bu.edu wrote:
> Hmmmmm... Yeah I'm interested. The only problem I'm aware of with
synth's had
I expected to drum up some interest w/that so I dug up the book. Here's
what it
says:
On page 164 under a section called "SYNTHETIC OIL"
"Synthetic oil is a relatively recent development, especially in its
application to
racing engines. It has been tested, and for most applications, it doesn't
seem to
harm the engine. However, it also doesn't offer any advantages if the
viscosity is
kept constant. Most synthetic oils are thinner than standard oils. Also if
the
engine already has scuffing problems (valve tips, etc.) synthetic oils
wouldn't be
recommended based on our testing because of their lack of sulfur. Lack of
sulfur
can be counteracted by additives. Refer to your service manual for specific
recommendations. If our engine build-up recommendations are followed, you
should
not have a scuffing problem in the engine."
Their engine build-up recommendations include a very tight piston-to-wall
clearance
per the magnum spec. Also, I understand that at least the 360 motors are
prone to
scuffing in the lower portion of the cylinder bores. My Challenger's 360
had bad
scuffing in this location.
I wonder if this has anything to do with the magnum engines using
Hypereutectic
pistons (do they??). I know that the magnum engines piston to cylinder wall
clearances are much smaller than most older engines. The spec says 2
thousandths I
believe. I just ordered a set of KB hyper's for my Challenger motor
rebuild - when
I get them back from the machine shop - I'll check to see what the
instructions say
- I seem to recall a warning about those particular clearances and about a
special
anti-scuff coating. Maybe the lack of sulfur does something to this
coating???
Anyone know for sure?
Latr,
Shane
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:48:03 EDT