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Sorry to hear no improvement in oil temps. I
personally believe that you may need to put a vertical divider in your plenum to
move more air over to the side (where it does not want to go) where the oil
cooler is. Being in the center of your air flow, the air is finding an
easier path through your radiator rather than turning and going through your oil
cooler.
I used An-10 hose for all of the oil line routing - so
don't know if An-8 is overly small or not - but, I think some folks are using
them successfully.
Also, make certain that the oil is routed into the oil
filter correctly, I've know of two people (me being one) that hooked them up
reversed. I found my error when no oil would flow during a cold cranking
session to build up oil pressure. The other person actually ended up
blowing holes in the rubber flap due to the pressure build up in the filter
before oil finally flowed - not the recommended way.
My oil pressure is generally around 30 lbs at low idle,
going up to 50 psi by 3000 rpm and at 6000 it is generally 70 psi although if
the oil is hot like after take off it may temporarily drop to 65
psi.
I do not use the stock oil pick up since my engine is
rotated 90 deg.
My 5 attempts to fix my oil temp problems produced
marginal improvements until I finally solved the problem by making certain the
oil cooler had adequate air flow. I suspect your problem may be
similar. The only thing I can suggest is to put a flow diverter to force
more of the inlet air to travel toward the oil cooler. I would do that
before undertaking any more drastic approaches.
Good luck
Ed
----- Original Message -----
Sent: Wednesday, July 04, 2007 6:44
PM
Subject: [FlyRotary] [Fwd: [Fwd: RV-7A
Cooling]]
Flew my RV yesterday with OAT of 83 deg F - should
have cooled really well - No Joy!! The water was OK but the oil cooling
just does not appear to cool any better after all the duct/air flow
improvements. The wedge oil pan did not help either- I guess I did not
have oil foaming after all. My oil level in the wedge pan is 3/4 inch
below the 1/2 inch aluminum mounting plate. Now I'm wondering if my oil
system is too flow restrictive. My oil pressure only reaches 85
psi when the oil is cool and when I'm flying it goes to the lower
60's. Oil pressure is measured on the adaptor plate where the oil
returnes to the engine.
My oil system is as follows: I
come out of the normal oil outlet - (I have not tapped the lower galley and
plumbed the oil outlet there) - with an An - 10 line to the Mazda (89?)
oil cooler. After the oil cooler, I use An-8 hose from the oil radiator
to an aftermarket oil filter housing with the K&N HP 1002 oil filter.
From the oil filter I use An-8 hose to go to the adaptor block on
the enigne. Two pictures of the oil system are attached. The
attached pictures are early pictures before the wiring etc. was in flight
ready condition.
The oil cooler is clean and I've removed and
checked the oil by-pass thermostat in hot water - it opened at or below 160
Deg F. Anyone know of an easy and accurate way to determine if it is working
properlly - maybe check temps. at both ends of the oil radiator as the engine
and oil heats up. Also, is there an easy way to remove the oil
thermostat and seal the bypass hole?
.JPG)
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