electric fan conversion
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.
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A puller is more efficient and will require shorter on cycle lengths as a general rule of thumb.
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Originally Posted by DigitalMarket
(Post 4265981)
A puller is more efficient and will require shorter on cycle lengths as a general rule of thumb.
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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. |
Originally Posted by Galaxy
(Post 4268682)
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. 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.
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It's not so bad if you get a controller that soft starts it.
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Originally Posted by ELVATO
(Post 4269896)
It's not so bad if you get a controller that soft starts it.
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.
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Why not get a dual elect fan from junkyard from an early ops Taurus? they were a two speed flow like a mofo
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those taurus fans from the SHO motors pulled around 3000 if i remember correctly?
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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.
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