Finn Lassen wrote:

Ok, here's some pictures as requested.

I think the front opening is about 1.5" x 3.5".

This "duct" was not not engineered as such. It's the way the cowling
came, with an added "box" in front, hopefully to force the air though
the first third of the radiator.

Finn

Thanks Finn I thing the side view is the best. I think a radius would
help if you have trouble with the oil temperature in the future.
One inch of foam glued on the outside and a few micro ballons would
do the trick.

Paul Lamar

Ed Anderson wrote:

Finn,
    If that is the size of the air duct for your oil cooler, you may find it
somewhat undersized.  I started out with a 3 1/2 " dia duct went to a 5" dia
duct and still had oil cooling problems on hot days.  Once I copied Jim
Mosur's approach and used a Mazda Oil cooler (like you have) and open up the
duct to 2"x10" (20 sq inch) the oil temp was no longer a problem. See
attached photo of duct that significantly lowered oil temp on mine and Jim's
RV-6.

Ed Anderson
Matthews NC.

Ed

That is a good looking intake duct Ed. As I recall you were using a
different oil cooler before. You have now obviously switched to a stock
Mazda oil cooler which may be more efficient. Also as I recall your diffuser
next to the rad was not bell shaped and the back of the rad was rather close
to the firewall. I think I have some pictures around here somewhere.

Paul Lamar

Finn Lassen wrote:

Well, so far I can't complain about oil cooling problems. Highest I've seen
(during 110 mph climbs are about 196F, although oil pan temps as high as 223F). I
did think about making the "scoop" variable, though. Also, I haven't really tried
Tracy's suggestion about putting some mesh or open foam at the rear part to dampen
any turbulence there. I guess once I get the prop repitched so the engine can work
harder during climbs, I may need to improve cooling.

Finn

 
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