pusher vs puller fan

sd88supra · 08-30-2006, 10:44 PM

ok, i installed a hayden 14" electric fan in my 87 NA after my fan clutch crapped out. thing is, even the damn fan clutch throws more air and cooled my car much better even without the fan shroud than this shrouded electric fan. i installed it as a puller, since space is scarce in front of the radiator. and yes, i remembered to flip the blade over and reverse the polarity (since they come pusher-ready). as far as spacing, the blades are about 1 inch from the radiator, best i could do withough leaving it all dangly. i dont think it should be closer to the engine, or should it?

my car right now almost seems bipolar. when running continuously, it runs at ideal temp. when idling or in heavy traffic the temp gauge sky rockets. as soon as i step on it it practically falls back down. after driving it around for a while, after turning off the engine you can hear the hot coolant boiling inside, something that never happened before my fan clutch crapped out. but, i dunno if this has anything to do with a bad water pump.

someone please tell me i need a better fan (if the fan is the problem). this is tempting me to go back to the damn fan clutch.

mrnickleye · 08-31-2006, 07:20 AM

My car is N/A, so heat is not such a concern as turbo.

The Hayden fan is only rated at 1100 CFM. That is what I am using too. Mounted to the back side of the radiator.

The boiling sound is normal when you shut off engine that is pretty hot. Its boiling the water, and the cap is letting it over into the bottle.

I always have my A/C on here in the desert, so my 2 little factory fans also run, which helps keep it cooler.

I run a 180* thermostat, which won't prevent over heating, but does allow it to run cooler if it can. Better than keeping the temp up to 195* minimum.

I also added a large (12"x15") transmission cooler right in front of the radiator (mounted to it actually), between the radiator and the A/C condensor. I removed the small 3/8" coolant by-pass hose (below the thermstat) and ran hoses out (under the afm)to the new cooler.

I calculated a 40% radiator increase.

It always runs about 1/3 on the gage, and never have the boil over sound anymore.

50/50 antifreeze. New cap.

If I were to ever need a new fan, I would get this.

http://www.jegs.com/webapp/wcs/store...tegoryId=10117

#720-1987...14" 1800cfm.

You may need this. Or do a search on this forum for electric fans others have used.

ddmcse · 08-31-2006, 07:16 PM

my elect fan throws 2950 cfm no shroud

that 1100 isn't going to cut it

mrnickleye · 09-02-2006, 04:48 AM

Quote:

Originally Posted by ddmcse

my elect fan throws 2950 cfm no shroud

that 1100 isn't going to cut it

That's my point. Gotta have a lot of air moving thru a supra.

What kind / brand are you using??

I may want to upgrade mine.

Also, I removed the rubber hood sealing strip on the body at the firewall. It helps let air out of the engine bay.

But not a good idea if your car has oil leaks, and smokes under the hood.

Isphius · 09-02-2006, 05:37 AM

The reason your car overheats when in traffic is because your not getting any air flow from the car moving lol. If this is happeneing, Your fan is underrated. Get a bigger one! Your fan is there just to cool the car when its moving slow. You dont even need the fan when your going down the highway or just going at least 25 or above. Ive driven around without my fan even on (on my way to get a replacement) And it was fine, Because i didnt stop.

ddmcse · 09-03-2006, 02:03 AM

im using a perma cool and i removed the rubber molding from the engine hood too

after i saw you did it .
it makes alot of sense to me

Isphius · 09-03-2006, 06:01 AM

You also need a shroud of some sort. That helps a lot more than youd think.

sd88supra · 09-03-2006, 10:23 PM

ok, i got a flex-a-lite 16" shrouded 2000 cfm fan... it still overheats, but very gradually. the temp gauge doesnt go up until ive been idling for several minutes. works fine for normal driving, even at traffic lights, but its gonna still be overheating under very heavy traffic. and im still getting that coolant boiling. it even looks like it sucked my reservoir bottle (it was almost collapsed) though the reservoir was full.

ive mounted it behind the radiator, as a puller. i didnt have to reverse the blades because it came puller ready, i just had to wire it as a puller.

-2000 cfm
-16" diameter
- shrouded
- puller

what i was thinking though, is that since the fan clutch is farther away from the radiator (and my electric fan is attached to the radiator) it could have something to do with it not having enough room to pull air from. any ideas/suggestions?

h8z2luze · 09-04-2006, 02:48 AM

Sounds like you might have a bhg??? Have you replaced the water pump and thermostat? I donno though. I just got a 2600CFM 16" electric fan. We will se how that goes.

sd88supra · 09-04-2006, 04:17 AM

i dont see how i could have a bhg, i get lots of compression and no white junk under the cap (or any other bhg symptoms). a bad thermostat and/or water pump would have my car overheating even when driving fast. its air im not getting into my radiator, i just dont understand why.

08-30-2006, 10:44 PM	#1
sd88supra 3" Exhaust Join Date: Oct 2005 Location: San Diego, Ca Posts: 190	pusher vs puller fan ok, i installed a hayden 14" electric fan in my 87 NA after my fan clutch crapped out. thing is, even the damn fan clutch throws more air and cooled my car much better even without the fan shroud than this shrouded electric fan. i installed it as a puller, since space is scarce in front of the radiator. and yes, i remembered to flip the blade over and reverse the polarity (since they come pusher-ready). as far as spacing, the blades are about 1 inch from the radiator, best i could do withough leaving it all dangly. i dont think it should be closer to the engine, or should it? my car right now almost seems bipolar. when running continuously, it runs at ideal temp. when idling or in heavy traffic the temp gauge sky rockets. as soon as i step on it it practically falls back down. after driving it around for a while, after turning off the engine you can hear the hot coolant boiling inside, something that never happened before my fan clutch crapped out. but, i dunno if this has anything to do with a bad water pump. someone please tell me i need a better fan (if the fan is the problem). this is tempting me to go back to the damn fan clutch.

08-31-2006, 07:20 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	I'm cool in the mojave desert. My car is N/A, so heat is not such a concern as turbo. The Hayden fan is only rated at 1100 CFM. That is what I am using too. Mounted to the back side of the radiator. The boiling sound is normal when you shut off engine that is pretty hot. Its boiling the water, and the cap is letting it over into the bottle. I always have my A/C on here in the desert, so my 2 little factory fans also run, which helps keep it cooler. I run a 180* thermostat, which won't prevent over heating, but does allow it to run cooler if it can. Better than keeping the temp up to 195* minimum. I also added a large (12"x15") transmission cooler right in front of the radiator (mounted to it actually), between the radiator and the A/C condensor. I removed the small 3/8" coolant by-pass hose (below the thermstat) and ran hoses out (under the afm)to the new cooler. I calculated a 40% radiator increase. It always runs about 1/3 on the gage, and never have the boil over sound anymore. 50/50 antifreeze. New cap. If I were to ever need a new fan, I would get this. http://www.jegs.com/webapp/wcs/store...tegoryId=10117 #720-1987...14" 1800cfm. You may need this. Or do a search on this forum for electric fans others have used. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

08-31-2006, 07:16 PM	#3
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	my elect fan throws 2950 cfm no shroud that 1100 isn't going to cut it __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

09-02-2006, 05:37 AM	#5
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	The reason your car overheats when in traffic is because your not getting any air flow from the car moving lol. If this is happeneing, Your fan is underrated. Get a bigger one! Your fan is there just to cool the car when its moving slow. You dont even need the fan when your going down the highway or just going at least 25 or above. Ive driven around without my fan even on (on my way to get a replacement) And it was fine, Because i didnt stop. __________________ Yay the supra assistant is gone!!! WEEE!!

09-03-2006, 02:03 AM	#6
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	im using a perma cool and i removed the rubber molding from the engine hood too after i saw you did it . it makes alot of sense to me __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

09-03-2006, 06:01 AM	#7
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	You also need a shroud of some sort. That helps a lot more than youd think. __________________ Yay the supra assistant is gone!!! WEEE!!

09-03-2006, 10:23 PM	#8
sd88supra 3" Exhaust Join Date: Oct 2005 Location: San Diego, Ca Posts: 190	Update! ok, i got a flex-a-lite 16" shrouded 2000 cfm fan... it still overheats, but very gradually. the temp gauge doesnt go up until ive been idling for several minutes. works fine for normal driving, even at traffic lights, but its gonna still be overheating under very heavy traffic. and im still getting that coolant boiling. it even looks like it sucked my reservoir bottle (it was almost collapsed) though the reservoir was full. ive mounted it behind the radiator, as a puller. i didnt have to reverse the blades because it came puller ready, i just had to wire it as a puller. -2000 cfm -16" diameter - shrouded - puller what i was thinking though, is that since the fan clutch is farther away from the radiator (and my electric fan is attached to the radiator) it could have something to do with it not having enough room to pull air from. any ideas/suggestions?

09-04-2006, 02:48 AM	#9
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	Sounds like you might have a bhg??? Have you replaced the water pump and thermostat? I donno though. I just got a 2600CFM 16" electric fan. We will se how that goes. __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505

09-04-2006, 04:17 AM	#10
sd88supra 3" Exhaust Join Date: Oct 2005 Location: San Diego, Ca Posts: 190	i dont see how i could have a bhg, i get lots of compression and no white junk under the cap (or any other bhg symptoms). a bad thermostat and/or water pump would have my car overheating even when driving fast. its air im not getting into my radiator, i just dont understand why.

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