Rubber intercooler mounts: check my work

I'm working on a mounting system for the Midlana's intercooler. After browsing the hardware store I settled on some aluminum angle to weld to the intercooler body for mounting tabs and some rubber bushings with an integral nut that expand when the bolt is snugged. I also found some tubing that is the correct size in my pile-o-metal.

Weld the tube to the chassis, insert the rubber bit and Robert's your mother's brother!

What I'm debating on is if these should be mounted in compression with the weight of the intercooler along the axis of the bolt, or in shear with the weight perpendicular to the bolt. 

I was originally thinking i would mount them in compression, but packaging will force at least the top ones to be mounted in shear. Once test assembled they seemed stronger in shear than expected too, and mounting them all this way would be the easiest solution.

Thoughts from the hive mind?

Well-nuts compress into hard mounts pretty rapidly in compression, so I would shear them. They are frequently used in tension where the rubber can expand beyond the diameter of the hole they are put in, see Volvo 240 roof rack.

TurnerX19 said:

Well-nuts compress into hard mounts pretty rapidly in compression, so I would shear them. They are frequently used in tension where the rubber can expand beyond the diameter of the hole they are put in, see Volvo 240 roof rack.

Exactly what I was going to say.  But, they are plenty strong any way you need to use them.  Just don't count on the rubber surviving when you want to pull it back out of the hole.