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Ok, Dennis. That small a hole should not make a
significant difference then. Just asked to make certain it was not the
possible cause of the problem. Actually more fluid (especially hot oil)
through a 0.02 opening than you might think. As I recall the old Ross
Redrive had a restrictor of only 0.03 and that still provide sufficient oil for
the redrive. But your flow through the 0.02 would probably be on the order
of a pint a minute or there abouts. So compared to the 15 or so GPM of oil
flow - it would be insignificant.
Yes, will be very interested in what difference the flow
divert makes (or not). I suspect that your primary challenge is to get
sufficient air flow through the oil cooler. The diverter should certainly
help get the proper balance between your oil and radiator.
Ed
----- Original Message -----
Sent: Thursday, July 05, 2007 9:30
AM
Subject: [FlyRotary] Re: [Fwd: [Fwd:
RV-7A Cooling]]
Buly, Ed, Mark
I have an air flow diverter already built and
will try it soon. It is 1/8 foam core board covered with one thin layer
of glass.
The oil filter mount came from Summit if I remember
correctly. I used the the arrows cast into the mount for oil in and
out. I will check by taking the filter off and pump oil out by turning
the prop. Oil should come into the filter near the outside - go through
the filter media and exit the center - correct?
I have looked at the
oil tank temperatures with an IR theometer. I'll record the data
as the engine oil warms up next time I run it.
Buly - its great to hear
you have such low temperatures with the same oil cooler. There is hope
for me!! My oil cooler is from a 13 B powered Mazda
.
The AN-4
line out the top of the oil cooler has an 0.020 in. orfice. It is
used to bleed out any air trapped in the high end of the oil cooler. The
delta pressure across the orfice is very low because of oil filter is the only
restriction in theparallel main oil return line. The water radiator is
also using an orfice and an AN-4 line to blead air out of it's high
end. I think these blead lines should only pass a very small
amount of fluid while automatically removing any trapped air.
Dennis,
I used
the same oil cooler on my Cosmo 13B and it was cooling too much in
flight 137F at cruise.
I see one thing you have done that disturbs me.
The oil line tapped at the high end of the oil cooler going into the
oil filter adapter plate.. By doing this, great percentage of the oil
is bypassing the oil cooler core and going back into the block.
If
it was me I'll block this outlet, and turn the oil cooler around, so
the oil gets in and out at the higher end. This will prevent an air
lock at the high end.
Buly
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