Electric cooling fan clearance

[Ryan.C]

I have run into a snag on my build. The electric cooling fan I purchased does not clear my water pump. I have a champion 4 core radiator and a rainbow products - http://www.rainbowproductsonline.com/shroud-fan-assembly/cooling-fans.php - 16 inch 2,500 CFM cooling fan. The fan motor needs an additional 1 to 1.5 inch of clearance in order to clear the water pump (to use as a puller). My question is can I run this fan as a pusher on condenser side and still expect reasonable cooling??   

[b5blue]

I've that fan. Run on my 26" 3 row brass radiator with after market A/C I was getting temps creeping up at idle with the A/C on in 97* weather. (As a puller.) With about 4" of distance between WP pulley to Rad. it fit fine but attached to the Rad. it's only pulling air through the center. I swapped to a thin fixed fan, spacer and shroud and it runs almost as good so I'm putting the elec. fan in front as a pusher to try. (I just haven't figured out mounting as there is hood latch crap in the way of mounting centered on my 70.)   

[justcruisin]

It doesn't say if the fan is reversible so it's most likely not, you may be able to reverse the wires and it will spin the other way but it wont be as efficient. A four core radiator is 3" thick, it needs a good air flow to pull the heat out of the core, I don't think the fan you have will cut it front or back especially with AC, and at 15 amps I would be skeptical of it flowing 2500cfm behind a 3" thick radiator. CFM ratings can be misleading depending on how they are rated. Give it a go, at least in your driveway. Most likely with limited room you will need to use a engine driven solid fan and a good fitting shroud or a high flow pusher may work, or both. Current draw is a good indicator of an electric fans grunt. Electric is a plus as you have maximum fan speed at an idle where you need it most.

[b5blue]

My bad...my fan has no shroud! 

[Ryan.C]

It doesn't say if the fan is reversible so it's most likely not, you may be able to reverse the wires and it will spin the other way but it wont be as efficient. A four core radiator is 3" thick, it needs a good air flow to pull the heat out of the core, I don't think the fan you have will cut it front or back especially with AC, and at 15 amps I would be skeptical of it flowing 2500cfm behind a 3" thick radiator. CFM ratings can be misleading depending on how they are rated. Give it a go, at least in your driveway. Most likely with limited room you will need to use a engine driven solid fan and a good fitting shroud or a high flow pusher may work, or both. Current draw is a good indicator of an electric fans grunt. Electric is a plus as you have maximum fan speed at an idle where you need it most.

After chewing on the info in your post I think the best course of action is to run a mechanical fan W/shroud and use the electric fan as a pusher AUX fan. Another issue I am having is the mechanical fan and clutch assy I have is far too long to use with this radiator. I recall reading about a shorter fan clutch assy several months ago on this board but I am unable to locate that thread as of this writing. Please advise.

[cdr]

1

[cdr]

It doesn't say if the fan is reversible so it's most likely not, you may be able to reverse the wires and it will spin the other way but it wont be as efficient. A four core radiator is 3" thick, it needs a good air flow to pull the heat out of the core, I don't think the fan you have will cut it front or back especially with AC, and at 15 amps I would be skeptical of it flowing 2500cfm behind a 3" thick radiator. CFM ratings can be misleading depending on how they are rated. Give it a go, at least in your driveway. Most likely with limited room you will need to use a engine driven solid fan and a good fitting shroud or a high flow pusher may work, or both. Current draw is a good indicator of an electric fans grunt. Electric is a plus as you have maximum fan speed at an idle where you need it most.

After chewing on the info in your post I think the best course of action is to run a mechanical fan W/shroud and use the electric fan as a pusher AUX fan. Another issue I am having is the mechanical fan and clutch assy I have is far too long to use with this radiator. I recall reading about a shorter fan clutch assy several months ago on this board but I am unable to locate that thread as of this writing. Please advise.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwjw2rCw2JHPAhWj5IMKHYSwA38QFgg2MAQ&url=http%3A%2F%2Fwww.haydenauto.com%2Fupload%2FHaydenAuto%2FDocuments%2FHayden_Low%2520Profile%2520Fan%2520Clutch%2520Flyer.pdf&usg=AFQjCNHAsSgmt50YJBBAoGDuaD2Izcu7PA&sig2=efTjafn2MA0ImYZmCu4SDQ

2947 Hayden

[Ryan.C]

  THANKS

[crj1968]

Hey Ryan- I had same issue when I put in my new radiator- researching I found this
... part number 215046  also made by Hayden (Imperial) for $40 and it bolted right in. It also came with the bushing thing. 

Advance Auto up on Franklin had it on the shelf.

[justcruisin]

If you can use a HD clutched fan that is the best. I can tell you that I use a clutched fan with 18" fan blade and shroud along with a 18217 Derele 17" fan on the front, this is on a 22" radiator with a 500hp 440 and i have zero issues, I have had it idling in traffic for over an hour, the electric fan only comes on in hot weather in slow traffic, cuts in at 190 and switches off at 180, never gets hot. I was told not to use a fan in the front and the rear as the air will stall, I haven't found that to be the case, the addition of the electric fan has been well worth the peace of mind.

[cdr]

Hey Ryan- I had same issue when I put in my new radiator- researching I found this
... part number 215046  also made by Hayden (Imperial) for $40 and it bolted right in. It also came with the bushing thing. 

Advance Auto up on Franklin had it on the shelf.

the one i posted is a HD short clutch.

[b5blue]

FYI The problem I'm having is the fan clearing my aftermarket (CAA) A/C compressor clutch. The Hayden 2747 fan clutch fit between the pump and rad. but the Derale 17119 fan touches the face of the A/C clutch. (The backside of the blades.)

[bigmogs]

I'm having the same problem, I have less that 3" from stock 26" rad to the front of the March water pump pulley.
Struggling to find a solution to this.. I've also got vintage air ac. My car is a 70, 383.
Found flexilite slim fans but I keep reading it will struggle in heat, as I am in Dubai.

[John_Kunkel]

2 3/8" thick and advertised 2500 cfm.

http://www.speedwaymotors.com/Cooling-Components-CCI-1780-Cooling-Machine-Electric-Fan-Style-80,42296.html

[justcruisin]

The C class mercedes fans shift a serious amount of air and are a good fit on the 26" radiator, there are a few variants and up to about 600 watts and spin a 19" fan from memory. I did do the exercise at one stage but went another route due to cost and not required in my situation.

The merc fans require a PWM ( pulse width modulation) control as they will burn out with full time 12V. You will also need a high output alternator capable of good output at idle as the fan draws up to 50 amps depending on load.

There is a company doing the controllers and the fans are available on ebay. If your interested in researching that system to see if it meets your needs I can find out who makes the control. Figure on the thick end of $1000 with everything.

[John_Kunkel]

The C class Mercedes fan is 3 1/4" thick.