Cooling Fans... pusher/puller.....

[biohazardbill]

So I have a 67 chevy, 454, small cam, nothing major done, mounted in forward holes in case I do upgrades and need taller valve covers later. Using March high flow pulley system. Radiator is a brand new 4 core. Between the water pump and the radiator i have 2 inches. The march pulley setup I have doesnt use a mechanical fan, not sure I would even have room for one. I get mixed info on what to use to cool this thing.

I found this from Summit

Yay fans

it says puller fans (which I will still have trouble fitting) runs 20% more efficient than pusher fans. It also says that manufacturers say not to use puller fans on 4 core radiators... figures...

So I was trying to figure out what pusher fans to get. In front of the radiator there is an opening about 15 tall and 28 wide. That video says for a big block i will need about 4500 cfm, I cant seem to find dual fan setups that come close.

Have you guys had similiar issues and if so what did you do?

Thanks in advance.

[cableguy0]

I would never bother with a pusher fan. Other than sitting completely still it will create a dead air space at the radiator. If the fan is trying to push air out and the wind created by moving forward is trying to push air in you just get a dead air space at the radiator and the engine will actually overheat. I always use puller fans and most factory fans are puller fans as well. You willl be surprised what you can grab at the junkyard. I have a dual fan setup from a 93 maxima on my truck. Took a little trimming of the plastic and it fight right in between the tanks on my stock 4 core for a 72 chevy.

[Gumby]

#1 have a decent air dam, and use a puller on a temp switch, it should only come on when not moving or speeds below 35.

[piecesparts]

A puller fan is more effective than a pusher

[biohazardbill]

Originally Posted by cableguy0

If the fan is trying to push air out and the wind created by moving forward is trying to push air in you just get a dead air space at the radiator and the engine will actually overheat.

Your comment confuses me lol...

Pusher fans go opposite side of the radiator thus push air towards the motor, not out of the engine compartment. So when driving when pusher fan would be pushing air in the same direction as the air flow from driving.

[SSC's76]

Originally Posted by biohazardbill

Your comment confuses me lol...

Pusher fans go opposite side of the radiator thus push air towards the motor, not out of the engine compartment. So when driving when pusher fan would be pushing air in the same direction as the air flow from driving.

not always some are setup on the inside of the radiator to push air out. what they suggest is to not use them like this but rather to draw air in. so if you were to mount them on either side as long as the bring air into the engine compartment thats fine just dont try and push air out.

[biohazardbill]

Originally Posted by SSC's76

not always some are setup on the inside of the radiator to push air out. what they suggest is to not use them like this but rather to draw air in. so if you were to mount them on either side as long as the bring air into the engine compartment thats fine just dont try and push air out.

This is the setup I was thinking about using. The fans between the radiator and the grill, pushing air towards the radiator from the grille of the truck.

I am going to take some more measurements in a few to see if I can somehow manage to get two singles spaced out around the water pump.

[crazy longhorn]

I have used a pusher, on the front side of the radiator (as an auxillery fan). The only time it ran , was in traffic @ idle speed (v8 S-10 or Ferd ranger), & they both had a fan on the waterpump? No issues, but if you ditch the mecanical fan, you will need a pair of pullers, with proper controlls to keep that engine cool crazyL

[biohazardbill]

Well I managed to squeeeeeeeeeeeeeeeeeeeeeeze in a couple of 14" fans. Supposedly 6000 cfm total.

Pics taken at night, sorry for poor quality

[wraprail]

Originally Posted by SSC's76

not always some are setup on the inside of the radiator to push air out. what they suggest is to not use them like this but rather to draw air in. so if you were to mount them on either side as long as the bring air into the engine compartment thats fine just dont try and push air out.

Huh?

Posted via Mobile Device

[ka_jd7and1]

Originally Posted by wraprail

Huh?

Posted via Mobile Device

You want the fan to be directing air through the radiator and into the engine compartment, same flow direction as if the truck was travelling forwards and getting air over the radiator through the front grille of the truck.

So, putting a pusher fan on the front of the radiator (grille side) or a puller fan on the back of the radiator (engine side) is fine. Putting a pusher fan on the engine side/puller fan on the grille side would not be okay.

Does that make more sense?

[crazy longhorn]

Originally Posted by biohazardbill

Well I managed to squeeeeeeeeeeeeeeeeeeeeeeze in a couple of 14" fans. Supposedly 6000 cfm total.

Pics taken at night, sorry for poor quality

Looks good....the proper on/off on the controls should keep her nice & cool crazyL

[biohazardbill]

I thought about either using this:

Probe

There is also one with a screw in connector but I think using the probe it will be easier to hide the wires.

Thoughts?

[Gumby]

I can say, stay away from the flexolite probe adjustable one, wired per the direction it was hot all the time, if the temp was above said setting the fan would run, aka shut off the engine hot, as temp rise it kicked back on for cool down, great design, cept id sometime find it still running hrs later killing my battery.

more visual design, wire the temp gauge to a light on the dash you can't miss, to cue you to turn them on on off as needed.

[crazy longhorn]

I ran Painless controls on mine (on 185/off165)....with a 160 stat, & 4 core copper/brass rad, she does what she should That old truck will idle in traffic, & never bust over190 on temp(fans switch on/off). On the hyway, she runs 175-180 on temp (fans never switch on). You can opt for a higher temp.....IIRC, 205 on/185 off. Best of fun,crazyL

[storm9c1]

Originally Posted by Gumby

I can say, stay away from the flexolite probe adjustable one, wired per the direction it was hot all the time, if the temp was above said setting the fan would run, aka shut off the engine hot, as temp rise it kicked back on for cool down, great design, cept id sometime find it still running hrs later killing my battery.

That's why you wire the power feed to the relay through the ignition switch. Fan motor power comes directly from the battery, but relay power can come from the ignition so they never turn on unless the key is on.

[Gumby]

directions were to wire it like a factory car, which the fan will run when its shut off on a hot day.

great idea "if" it shuts off.