Mat,
I feel that it is simply size that is the problem. I have run 2 sizes, First was 300 cub inches and then I cut down to just over 250 cub inches. The bigger worked very well, so I cut down in the next install due to size. It still cools well but borderline, so hoping it will handle the turbo?? Here 85 degrees is very cold, so my suggestion is to upsize the cooler size—sorry more work but that is simply my opinion.
Neil;
From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, May 14, 2021 7:01 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Oil Cooler sizing
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?
https://www.youtube.com/watch?v=ONO4bJvw5rc