https://www.cxracing.com/oil-cooler-kit/OC-248-30-AN10

To create a Kays & London wedge shape for the inlet, I could of used a flat stock and called it a day. But really it's an 'S' shape to maximize equal amount of air to flow across the rad. Plus I had to make the wedge shape, turn into an 2.75" pipe opening for the scat hose. I wanted to keep the bends like a trumpet, to maximize the air sticking and following the sides without disturbance. Could of sanded and shaped the pieces out of foam for days and days.. Or punch them into autocad. 3D print the parts, then fiberglass overtop of the molds.

The last two pictures (oil4 & oil5) are how I had to make the outlet, with foam and bondo. I couldn't get good measurements around all the pipes and motormounts, so I couldn't 3D draw it. Was easier this way, to build it in place. Took 10x longer to build.

The outlet has a large 5" box to catch the expanded hot air. Then it necks it back down to a 2.75" outlet pipe. The idea is the speed the air back up before it exits. I also added a butterfly valve to the outlet, to be able to control the temps. This should help fine tune my system (inlet, outlet, exhaust, cowl air exit), by watching how much the valve needs to more to keep temps stable at different flight speeds.

https://youtu.be/giueLT-icjI