Attached is a pic of just the mount for the oil cooler. I drilled out some rivets that go thru the fw into the angle structure behind the firewall, enlarged the holes for an3 bolts (watch your edge distance!), and bolted the mounting angles to the firewall. The middle bolts have backing plates on the inside of the fw. The flanges of the SW8406R cooler go above the angle on the top and below on the bottom--then use standard long an3 bolts to mount the cooler to the angle.
The oil cooler diffuser was made from fiberglass. I actually did the lay up on my oil cooler after covering it in celophane wrap. Doing the layup on the cooler insures a tight leak free fit. I used standard floral foam to create the form, smoothed it with polyester resin and micro, sanded the form smooth, waxed it, set in on the cooler (protected by celophane), and covered with about 4 layers of 8 oz cloth with West systems epoxy. If you do this make the transition from 4" sceet tube to the rectangular cooler shape as gradual as possible--this will insure the greatest cooling efficiency. Also smooth the inside as best you can for clean flow.
For extra strength I bonded a couple of pieces of alum angle (032) into the diffuser where it meets the mount. I am very happy with the result--my oil temps are running in the 178-188 degree f range.
Hope this helps!!
Cheers,
db
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