Ed Anderson wrote:

 > 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

Paul,
    You are correct.  I initially used one of Earl's larger oil coolers
(11x8x1/12) positioned approx a foot from the firewall with a SCATT duct for
the air.  Never could get it to cool right although different mods
incrementally improved the cooling.  So don't know if it was the oil cooler,
its position, or what, but switching to the Mazda and moving it up front
under the spinner, similar to Jim Mosurs RV-6,  made all the difference.
Oil temps would go up to 220F on take off and now rarely exceed 190F.

  Since the total area for my radiator cooling openings is approx 48 sq in
and they dump 2/3 of the heat load, the 1/3 for the oil cooler, in my case,
should be approx 24 sq in and my 2 1/2 x 10 opening is close to that.

Ed Anderson

Ed where is your oil temp prob? Finn apparently has two. At least one
in the pan.

Paul Lamar
 
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