Oil Cooler recommendation

Have always mounted oil coolers from their bottom brackets, supported from the bottom. Top support only places more stress on the fins and tubes that they may not have been designed for. Never felt the need to thru bolt to the top, preferred leaving the cooler less susceptible to torsional motion and possible failure.
Always supported the oil lines to reduce vibration and motion from leveraging on the oil cooler fittings and the oil cooler structure. It's a balance between securely locking everything down or allowing them some flexability to absorb some motion. All in a race car bent on self destruction!

Don't mount the cooler too rigidly. Mount the cooler and radiators with an eye to allowing them to move somewhat with chassis flexibility and controlling random motion of the support hoses. Have seen some coolers with small spring mountings to allow for motion and crash flexibility to enable them to survive.
 
I have been using the Mazdacomp oil cooler or Sebtrab on 13b or 12a for last 10 years. I have never had a cooler failure. My oil pressure at WOT is usually at 100 to 115 psi depending on the engine. Most of my mounts in the various chassis' has been relatively rigid, but I always add a thick foam or even some blobs of silicone about 1/8" to 3/16" tall after setting. Then install the cooler in the u-shaped brackets that are holding the cooler.

Good Luck...
 
On my Rotary engines, I use a converted old style GM A/C evaporator for a oil cooler. They are designed for much higher pressures. rugged and more than adequate to cool the oil. They are also clean inside and except for aluminum AN fittings and welding, very reasonable in cost. I also soft mount them to the body, not the engine, to avoid high frequency vibration.
 
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