two questions - why not a pusher fan, instead of a puller? since there appears to be more room in front of the radiator than behind it, why not mount the fan there and have it blow through the radiator?

second - does the markVIII fan really pull 42amps? wow! how do you handle that load?

jg

 

When doing efans yout remove the mechanical fan which will give you more room. Pusher fans are normaly hooked up for ac use.

 

A puller is more efficient and will require shorter on cycle lengths as a general rule of thumb.

 

now that answers the question! thanks!

 

I'm not certain, but I would venture to guess that fan only draws that kind of current during initial start up. Most electric fans have a bigger spike in the draw during start up, but it's for milliseconds.

Puller fans are more efficient because they create a low pressure behind the blades, which is across the radiator in the case of a puller. A low pressure like this aids in cooling. Although very minimal, it's still there. A pusher fan on the front would create a high pressure in front of the blades. In the case of a pusher, this high pressure would be across the radiator and a high pressure creates heat. A pusher in front of the radiator would also block the surface area of the radiator, again decreasing cooling.

 

got it, that makes sense.

however, the 42 amps i read for the MarkVIII is running amps - the start up is even worse. a 42 amp load for an efan just doesn't sound right - if it's that bad, why switch? OTOH, the MarkVIII is supposed to be able to move a whole lot of air...

 

I think I read somewhere that the MkVIII draws 80+A at start up. But is does have a high CFM well over 3000..prolly closer to 5000.

 

It's not so bad if you get a controller that soft starts it.

 

aha! thanks for that tip.

as to the 5000 CFM: holy toledo!! screw the engine, this fan is like one of those swamp buggies with the prop on the back... who needs a motor?

 

It seems to me that puller fans draw air more uniformly across the radiator since they sit back a little and don't have the motor blocking as much.

 

Why not get a dual elect fan from junkyard from an early ops Taurus? they were a two speed flow like a ****

 

those taurus fans from the SHO motors pulled around 3000 if i remember correctly?

 

On my Lightning I used a Mark VIII fan with a Mad Enterprise's controller. It has 2 relays in parallel. My fan pulls around 50 amps for start and runs around 25-35 amps. The controller has 2 sensors. One for the radiator which you can adjust to suit your needs. The other can be used in the evaporator so your a/c stays cold.