Wrathall Mark wrote:

Paul wrote>I am also getting ready to try turbine oil in this engine when
I put it on the dyno/test stand.

Do you mean as main oil or injected oil?Turbine oil is very low viscoity,
and turbines as you know have no journal bearings. Have you ever seen an SAE
rating for it? As for burning the stuff as premix for the seals you know my
opinion.

Main oil. Before I do I will up the bake test to 600 degrees F and compare it
with Mobil 1. If it is significantly better than Mobile 1 there would be
an advantage as far as oil getting by the side seals and coking on the rotor
sides or in the combustion chamber. I will still use two cycle oil mixed
with the fuel. PL

Seeing as Tracy had a clean engine after nearly 1000 hours on conventional
main oil and two stoke premix, I find it difficult to perceive any benefit
from trying turbine oil. If you wreck the newly rebuilt engine bearings of
the stand if will cost. If you damage the newly built engine on the stand
and it fails aloft it will hurt . If the goal is to foster a safe proven
Rotary alternative. then it would seem better to concentrate on the unproven
parts, automotive oils plus two stoke premix/Injection work.

I know the temp limits of automobile oils. See comment above.

Is any body else considering Turbine oil? If not and you wreck your engine
no one is going to pay you for this data point. I lknow you are curious, but
what it that knowledge worth?

Worst thing can happen is you slowly lose oil pressure as the bearings wear.
I feel confidant that it will not attack the soft seals.

Even if Turbine oil works, what is the benefit? It costs as much as
Automotive/two stroke oils. It is probably more difficult for most people
to get hold of (every turbine operator has cases of it, but most of us
aren't set up to retail it).

If it is significantly better than Mobile 1 there would be an advantage 
as far as oil getting by the side seals and coking on the rotor
sides or in the combustion chamber. Most airports that cater to biz
jets here in the states have it.

Injecting main oil into the CC was a marketing forced compromise which most
ACRE's people avoid.  Once you provide Two stoke oil to the CC, does it
really matter which brand? That would be an interesting question.

Mark Wrathall

I want to take a giant step and not a small step :-) Let somebody else
test the small steps in synthetic car oils at 500 degrees.

Paul Lamar
 
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