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
ps: Remember folks - I'm just the messenger 8-)
-- '96 IndyRam w/lots of mods (mine) '96 IndyRam w/lots of options (wifes) - also a numbered (#142) "Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
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