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Hi Matt, size is important but so is location and ducting. I'm running with two Fluidyne 11 x 5.5 x 2.75 oil coolers - I'm over-cooled on oil but my coolers are placed in the bug-eye openings (15 sq in each) and are oriented perfectly for least resistance to air flow. Also my airplane (Chubby Cubby) is NOT fast; climbs at 80 mph and cruises at 100 mph.
Jeff from Canada
I'm trying to tackle the oil cooling. Currently have a CX racing 11x9x2 (https://www.cxracing.com/oil-cooler-kit/OC-248-30-AN10)
On a 30C / 85F day in FL @ 2200rpm cruising
Coolant is 180 outlet / 170 inlet
Oil is 225-230 pan / 200 inlet / 215 PSRU.
I use Valvoline VR1 20W-50 standard oil, and have synthetic sitting on the shelf ready to go. Since we can't post much in pictures here, I put a video on youtube of the setup. The cowl inlet is 4" and the opening to the start of the wedge is 3". I added some turning vanes to help the wedge shape send more air to the front, but didn't change the temps too much.
The only thing left to do is increase the opening on the wedge. I could probably get away with a 5" opening. If that doesn't work, then time to source out a bigger rad. What sizes are you guys running?
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