The fan motors Ive used are from a Peugot 405 (not sure how many of them you will find in the scrappy)

The main reasons I chose these motors are.....

High torque, they are large diameter motors and have some grunt!

relaible, they last forever and so far have not kicked out any EMI of note.

arguements against.....

heavy, 2.2kg each.
back emfs, not too gentle on controllers.

I used mine to spin a 3kg, 18bar up to 6000rpm inside 3 seconds, without gearing. May be a bit underpowered for the current generation of heavyweights, bt using 4 will compensate for that.