Big Block Fan

-
5.7 hemi

5.7 hemi

FABO Gold Member
FABO Gold Member
Joined
Apr 18, 2009
Messages
4,301
Reaction score
4,884
My 69 Dart GT now has a 400 stroked to 470, 26" ECP radiator. The problem Im having is with setting up a clutch fan. This all started when I figured out that my 4 row brass/copper 22x19 with shroud and fixed fan did not have enough cooling at idle. So I got a FlowKooler pump and Milodon high flow 180 thermostat, which help some but still not enough as I'm going to have ac. I also have the Holley Terminator set up, so air fuel ratio isn't a concern nor is the timing.

I tried the Hayden 2947 clutch which is the smallest they make but I need more room. So I got the Volvo 2 speed fan and it's too thick to fit anywhere as it will hit the water pump pulley. I have 2.750 between the core and water pump pulley, so does anyone have any thoughts as to what I can do? I really don't want the fixed fan running all the time, if it comes down to it, so be it.
 
5.7 hemi said:
My 69 Dart GT now has a 400 stroked to 470, 26" ECP radiator. The problem Im having is with setting up a clutch fan. This all started when I figured out that my 4 row brass/copper 22x19 with shroud and fixed fan did not have enough cooling at idle. So I got a FlowKooler pump and Milodon high flow 180 thermostat, which help some but still not enough as I'm going to have ac. I also have the Holley Terminator set up, so air fuel ratio isn't a concern nor is the timing.

I tried the Hayden 2947 clutch which is the smallest they make but I need more room. So I got the Volvo 2 speed fan and it's too thick to fit anywhere as it will hit the water pump pulley. I have 2.750 between the core and water pump pulley, so does anyone have any thoughts as to what I can do? I really don't want the fixed fan running all the time, if it comes down to it, so be it.
Click to expand...
Same here. I have a fan controlling FAST 2.0 f. inj. set up. It will control 2 fans. I run a 17" 7 blade direct drive mech. fan, (had to mod./raise the top of my home made /summit shroud for that ) and a 15" pusher , about 2" off the radiator on the pass side. Trans cooler about 2" off on the drivers side. 28X19 alum. crossflow w/ , 1 1/4" tubes. barely enough room in front of the radiator for both. It is working, but I doubt I could run A.C. How much did the flow cooler pump help ??
 
That did quite a bit, I could see temps drop and it stayed about 200 while going down the road. But since ac is going in, I need a bit more wiggle room for temps. You’ll like the Flowkooler pump, kinda pricey though.
 
Got the 26” ECP radiator in along with fan shroud. It’s tight to power steering pump pulley, but clears.

073DF66E-FC7A-4B5F-BF7E-D9B10B2742DF.jpeg


826D2A5C-ADCE-4954-A690-C23ECDFA6FD6.jpeg


F674F790-790B-44E2-B1E3-5C8C5973F23D.jpeg
 
The mechanical fan couldn’t keep the temps down so I moved the radiator back to get clearance for s clutch fan.

I’m using the Hayden 2947 and now my 470 is cooling like I want.

F543E931-3A1B-4355-AEB0-309EB509F381.jpeg


06CFEC4F-97E9-40DF-B2CA-66AEF77B254C.jpeg


48A19D40-D998-40D8-AFC9-6F7ABD892390.jpeg


E70177A1-7C33-462A-ACC9-563FAE9D22EA.jpeg


B6E84F70-1A07-4C14-A571-05667DCA3B08.jpeg
 
Yes. But the mechanical wasn’t 1/2 in 1/2 out of the shroud. Plus the clutch fan has a steeper pitch blade and they are both 7 blades.
 
Spoke too soon. Friggin’ thing isn’t cooling at idle. Back to the drawing board.
 
Your radiators are too thick. Get t three row brass copper, or a two row aluminum and it will be plenty. Your problem isn't radiator. It's air flow. If you get a thinner core, you'll have the room you need for a clutch fan unit. That will solve the idle over heating issues, I believe.
 
RustyRatRod said:
Your radiators are too thick. Get t three row brass copper, or a two row aluminum and it will be plenty. Your problem isn't radiator. It's air flow. If you get a thinner core, you'll have the room you need for a clutch fan unit. That will solve the idle over heating issues, I believe.
Click to expand...
mine aint too thick , its a 2row , w/ 1 1/4" tubes.
 
It’s a 2 row 1” tubes. I’ve narrowed it down to air flow at low low speed. All my components are new. Clutch fans, Hayden 2765 and 2947 are new and neither one is engaging when water temp is 220, so they are bad.

I’ve got Derale dual fan PWM set up, so I’m gonna mess with it to get in there, they pull 3750cfm at full boogie. Hopefully I can get fitting and it should take care of the problem.
 
5.7 hemi said:
It’s a 2 row 1” tubes. I’ve narrowed it down to air flow at low low speed. All my components are new. Clutch fans, Hayden 2765 and 2947 are new and neither one is engaging when water temp is 220, so they are bad.

I’ve got Derale dual fan PWM set up, so I’m gonna mess with it to get in there, they pull 3750cfm at full boogie. Hopefully I can get fitting and it should take care of the problem.
Click to expand...

Anyone know what a factory 7 blade 17" mech. fan pulls / cfm wise ? Gonna drive the fish to mens prayer breakfast this morning / show off a little . I haven`t heard my elec fan kick on this winter, set to come on at 195 . Course I haven`t driven it much, hope to get it fully broke "in" this summer , time permitting. .
 
When they are engaged, somewhere in the neighborhood of 5-6k cfm. That’s what I’ve heard/read on the internet, so take it with a grain of salt.
 
I got the Derale dual fan set up installed and working. Temps are now 187/188 and when I have the ac working, this should allow me to run 195/198. I’m happy with how it works. The PWM is awesome, slowly ramps up to full boogie and then runs for 30 seconds after shutoff.

9F41FA2B-D72F-45AE-A2ED-66152B1383A6.jpeg


E0F9D469-D004-409B-9D23-6D9FFD73C20C.jpeg


20A83380-D7EA-47DA-9690-1A7D694FFA87.jpeg
 
You must log in or register to reply here.
-

Back
Top