I need to put in a pusher electric fan on my truck. The engine is a mild build 460 and the radiator has a built in transmission cooler. The radiator is also a big sucker, all aluminum. It can fit up to a 19" inch fan in front.
My questions are 1) Is there a certain cfm I should get? The radiator shop guy said anything should work and no shroud was needed, but I'd rather get advice from you guys. Since it's a pusher it makes sense not to cover the rest of the area around the fan with a shroud, but the cfm's vary considerably on what I find in the catalogues.
Also 2) I know I've asked this before, but is Summit's brand good? Or should I dig deep and go for something like spal?
Lastly, 3) what about the relays to switch it on and off at certain temp ranges? Thanks Steve.