Air Compressors

That's the difference between the Bigred and the Bluetounge, both are thomas compressors but the bluetounge has a fan cooled motor to prevent the over heating you talk about.

Good compressors though, Thomas make some of the best around.

Have you thought about hooking up a 12vdc high powered fan to blow through the vents onto the motor? Could solve the problem... Might be a little tricky to setup with positioning the fan etc, but might be worth a look. You can buy little fans from Jaycar, Dicksmith etc. Dicksmith do a 90mm 50CFM thats moves a far amount of air for bout $20.