Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-03-2009, 01:29 AM   #181 (permalink)
Grrr :-)
 
Nerys's Avatar
 
Join Date: May 2008
Location: Levittown PA
Posts: 800

Cherokee - '88 Jeep Cherokee
90 day: 19.44 mpg (US)

Ryo-Ohki - '94 Geo Metro Xfi
90 day: 50.15 mpg (US)

Vger 2 - '00 Plymouth Grand Voyager SE

Ninja - '89 Geo Tracker
90 day: 30.27 mpg (US)
Thanks: 12
Thanked 31 Times in 25 Posts
hmmm I don't see how that will make much difference. you make the fan more aero just before you hit the brick wall of the engine clock itself?

the point of the CLUTCH is to do exactly what it (flexlite) wants to do. when the fan is not needed the clutch is "looser" and the fan kind of pinwheels free spinning ie almost no engine load. as it gets hotter the clutch tightens up and provides more air.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-03-2009, 02:51 AM   #182 (permalink)
Jeep Ecomodder
 
JeepNmpg2's Avatar
 
Join Date: Aug 2009
Location: Georgia
Posts: 160

Daddy's Jeep - '00 Jeep Cherokee SE
90 day: 19.66 mpg (US)

Mama's Kia - '06 Kia Sedona LX
Thanks: 16
Thanked 24 Times in 13 Posts
Fan Clutch

Maybe my issue is a worn out fan clutch, because that fan is anything but spinning loosly when the engine is not at full operating tempreture, and especially in the winter, it really counteracts the vehicles ability to warm itself. So I'm now between a $360-380 upgrade (which I found out from the manufacturer that the Fan Controller I'm looking at is more than capable at handling the maximum draw of my fan).
  Reply With Quote
Old 12-03-2009, 03:01 AM   #183 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Why do you need all that stuff?

You can get an e-fan from any junk car for $20... check what's being parted out on your local Craig's List site, and get some measurements for your vehicle.

The only other thing you need is a thermoswitch set to whatever temp you want the fan to come on at, usually ~200degF. Wire the fan direct with the switch and a 10A inline fuse to the battery, nothing else is necessary.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 12-03-2009, 03:58 AM   #184 (permalink)
Jeep Ecomodder
 
JeepNmpg2's Avatar
 
Join Date: Aug 2009
Location: Georgia
Posts: 160

Daddy's Jeep - '00 Jeep Cherokee SE
90 day: 19.66 mpg (US)

Mama's Kia - '06 Kia Sedona LX
Thanks: 16
Thanked 24 Times in 13 Posts
Junkyard E-fan

Two issues

1: Fan must be rated at 4000 CFM+ to be a direct swap for the stock mechanical fan. I run out in the Mohave in the Summer and see 125+ degrees in freeway and stop & go traffic so I cannot accept a decreased cooling capacity

2: 85 AMP startup draw which with the fan only cycling on for 5-10 seconds under normal conditions and off for a minute, will prematurely wear out the fan motor and whatever relay or continous-duty solonoid.

I still contend that the fan controller is the "ideal" setup, though I wholeheartedly agree with not throwing tons of money at this unless no other truly viable long-term option exists.
  Reply With Quote
Old 12-03-2009, 04:02 AM   #185 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
I don't think I've seen a radiator fan that draws 85A on startup... that's ALOT. In fact, they're usually wired with 14G or 12G wiring, which doesn't like 85A.

I think you'd find that you actually could deal with somewhat decreased cooling capacity, but that's not an argument, if you don't want to decrease, you don't have to.

Check on fans that are used for reefer units, they'll surely have the capacity you need.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 12-03-2009, 08:38 AM   #186 (permalink)
Grrr :-)
 
Nerys's Avatar
 
Join Date: May 2008
Location: Levittown PA
Posts: 800

Cherokee - '88 Jeep Cherokee
90 day: 19.44 mpg (US)

Ryo-Ohki - '94 Geo Metro Xfi
90 day: 50.15 mpg (US)

Vger 2 - '00 Plymouth Grand Voyager SE

Ninja - '89 Geo Tracker
90 day: 30.27 mpg (US)
Thanks: 12
Thanked 31 Times in 25 Posts
Cherokee's DO RUN very hot. in fact they are designed to run just under boiling a 210'

they are just hot critters so adequate cooling especially in 125+ desert running is critical.

maybe you could use lesser fans if you used 2 of them? one in front and one behind the radiator? have one kick on at one temp and the other kick on at a slightly higher temp (this way if you need just a little cooling only the one will come on but when its really hot both will kick)
  Reply With Quote
Old 12-05-2009, 05:22 PM   #187 (permalink)
AeroGuy
 
eco_generator's Avatar
 
Join Date: Sep 2008
Location: Ohio
Posts: 220

Outback 14 - '14 Subaru Outback Limited
90 day: 25.36 mpg (US)
Thanks: 67
Thanked 26 Times in 24 Posts
Quote:
Originally Posted by Nerys View Post
the point of the CLUTCH is to do exactly what it (flexlite) wants to do. when the fan is not needed the clutch is "looser" and the fan kind of pinwheels free spinning ie almost no engine load. as it gets hotter the clutch tightens up and provides more air.
That clutch may get "loose", but it is still drawing loads of parasitic power. It can soak up 5hp before the fan even begins to turn. I got rid of one on my Subaru wagon, with 95 hp and loaded with work equipment there was not a whole lot of extra horsepower to just lose in a fan. I took it off (it also has an electric fan) and the extra power was immediately noticeable.

So losing the clutch fan is a win/win. You will save gas just from not turning that clutch all the time.
  Reply With Quote
Old 12-05-2009, 05:39 PM   #188 (permalink)
Grrr :-)
 
Nerys's Avatar
 
Join Date: May 2008
Location: Levittown PA
Posts: 800

Cherokee - '88 Jeep Cherokee
90 day: 19.44 mpg (US)

Ryo-Ohki - '94 Geo Metro Xfi
90 day: 50.15 mpg (US)

Vger 2 - '00 Plymouth Grand Voyager SE

Ninja - '89 Geo Tracker
90 day: 30.27 mpg (US)
Thanks: 12
Thanked 31 Times in 25 Posts
wow. did not think they consumed so much power.
  Reply With Quote
Old 12-05-2009, 06:22 PM   #189 (permalink)
AeroGuy
 
eco_generator's Avatar
 
Join Date: Sep 2008
Location: Ohio
Posts: 220

Outback 14 - '14 Subaru Outback Limited
90 day: 25.36 mpg (US)
Thanks: 67
Thanked 26 Times in 24 Posts
I was shocked, also.
  Reply With Quote
Old 12-06-2009, 12:37 AM   #190 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Yeah, anything that requires a fluid drive is fairly lossy. Fluids are quick to thermal transfer, usually, and the heat energy has to come from somewhere, right?

What a clutch fan is doing is leveraging airflow against heat energy. If the air is denser than the amount of power being transferred, the fan doesn't speed up, which heats the fluid, which gets thicker, forcing the fan to turn through the air. It's a net waste of energy in any sense.

__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Reply  Post New Thread


Tags
low pressure kills mpg's

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aeromods V1.0 trikkonceptz Aerodynamics 50 10-14-2011 12:30 PM
Glides like a Brick Wall (Jeep Cherokee, GMC Pick-up) DonEaston Aerodynamics 22 10-26-2008 05:17 PM
jeep aero mod ideas johnpr Aerodynamics 22 08-27-2008 08:45 PM
mpg + jeep - thinking cap help? tkmd EcoModding Central 6 04-28-2008 10:15 PM
Off-Road Test: '08 Jeep Grand Cherokee (Rally Race) RH77 The Lounge 4 02-25-2008 04:59 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com