Colin: there have been actual independent scientific studies done on
multi-grade oils and the same was found about all brands, all the hype =
is a
crock. The oil stays at the lowest viscosity marked on the label. (i.e. =
5W30
always acts like 5 weight no matter what temp) It should be noted that =
the
lower grade marking is for start-up only in colder climates as heavier =
oil
takes longer to flow at lower ambient temperatures. This is a non-issue =
with
our intended usage. The best way to think of it is ask yourself why =
assembly
lube is so thick, the answer is simple, the lighter the oil the faster =
it
will run off the part it is supposed to be lubricating leaving you with =
a
completely dry cylinder wall or bearing surface at startup. Not a good
situation under any circumstances. The owner is better off using a =
straight
grade of oil and changing it more often as climatic conditions dictate. =
The
only discernable difference between the different brands was the amount =
and
type of additives in each. Rotella T from Shell is in fact a very high
detergent oil made for diesel engines. As a matter of interest to those =
here
that ride motorcycles, 20W50 Harley oil is in fact 20W50 Aeroshell. Over =
the
years I personally have used Valvoline in all my engines with =
spectacular
results and have never experienced bearing failure even under the =
extreme
conditions these engines are faced with. Hey if it's good enough for
$100,000 racing motors it surely is good enough for me. This was a point =
of
contention with my sponsor (Shell) on several of my drag race bikes but =
I
would not back down and they had to be content with supplying the fuel =
only
(100LL).
You are right regarding small oil ports on modern engines but let us
not forget that most of the KRNet guys are running VW's or Corvairs and
these cannot be termed modern engines by any stretch of the imagination.
High volume oil pumps are a good addition to any engine to aid in heat
dissipation BUT as you have stated they must be accompanied by a deep =
sump.
As well bearings need to have a modification done to them to take =
advantage
of this greater volume as well as the addition of a high quality oil =
cooler.
Heat kills, no matter whether oil, water or air and that is why great =
pains
have been taken over the years to design balanced systems that work =
together
in keeping engines within certain operating temperatures. Builders need =
to
keep in mind that ALL these factors need to be addressed when making =
changes
to any engine used for purposes other than that they were originally
designed for.
Doug Rupert=20
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