Fordmods Logo

Clutch Fan 

 

Page 1 of 2 [ 17 posts ] Go to page 1, 2  Next

 
 Post subject: Clutch Fan
Posted: Sat Jun 28, 2008 3:37 am 
Oompa Loompa
Offline
User avatar

Posts: 33

Joined: 30th Jan 2007

Ride: 1996 EFII Ford Falcon XR6

Location: Melbourne
VIC, Australia

Hey,

I've been reading up on the clutch fan (yes i used search)
I've always had a noisy clutch fan, when I drive down a street people turn around looking to see what the hell that noise is.

So after reading some stuff I'd like more information on how the clutch fan works. Mine makes the same noise and blows the same amount of air whether the engine is cold or hot, day or night. Am I to understand this isn't right?

So:

2 Questions:
1) How does the clutch fan work?
2) Do I need a new clutch for the fan?

Cheers,

renegade334

 

_________________

1996 EFII Falcon XR6 - K&N Pod Filter - Otherwise stock as a rock

Top
 Profile  
 
 
Posted: Sat Jun 28, 2008 9:46 am 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 1966

Joined: 13th Aug 2005

Ride: 2000 Au wagon

Location: some where in nsw
NSW, Australia

the clutch fan is a viscus fluid type,,it senses the speed of air moving over it and adjusts the fluid thickness to suite its needs,,IE: if it needs more air it thickens the fluid.

yes a new clutch will be needed.

you will have others tell you to change over to thermo fans,,but while they are good sometimes its just not worth the time and effort.

shame your in Melbourne,,i have two complete fans including blades ready to fit,,,

hope this helps

 

_________________

Image

Top
 Profile  
 
 
Posted: Sat Jun 28, 2008 12:10 pm 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

naughtyfalcon wrote:
the clutch fan is a viscus fluid type,,it senses the speed of air moving over it and adjusts the fluid thickness to suite its needs,,IE: if it needs more air it thickens the fluid.


you are half right

viscous fluid yes it does not sense the speed of the air ffs

when the rad heats up the air flowing over the clutch fan hub is warm and warms the fluid inside it allowing the fan to spin
hence when the rad is cold the air over the clutch fan is cold and slows down the speed of the fan

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Sat Jun 28, 2008 2:42 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 1966

Joined: 13th Aug 2005

Ride: 2000 Au wagon

Location: some where in nsw
NSW, Australia

well half right ffs

 

_________________

Image

Top
 Profile  
 
 
Posted: Sat Jun 28, 2008 10:16 pm 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

i said that hahaha

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Sat Jun 28, 2008 10:29 pm 
Getting Side Ways
Offline

Age: 42

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

I'm not sure that there's even been half right yet. Viscous couplings have the unusual property of generating more friction the hotter the fluid gets.

I don't think the heat from the radiator makes much difference in the overall scheme of things, but anyway, the hotter the radiator is, the hotter the coupling will be, and therefore the stiffer you want the coupling to be so it pushs more air. You want it to push more air because the radiator is hot, meaning the engine is hot. A viscous coupling will do this.

The following are what i see as being pertinent:

Scenario 1, You hold the revs at 5500rpm while the car is stationary. The motor will generate some heat doing this, yet there is no natural air flow through the radiator and engine bay. So you need to the fan to flow heaps. So you need the coupling to be stiff. The coupling will be stiff, because the motor is spinning the axle fast and the natural airflow is low providing a lot of resistance, which heats up the fluid and makes it stiff. This scenario is the biggest test of the coupling, placing the most stress on it.

Scenario 2. The revs are steady at 1500rpm while the car is travelling at 100km/h. The motor will generate a moderate amount of heat, and there is a lot of natural airflow through the radiator and engine bay. Because of the airflow you don't need the coupling to do all that much, but you still want it to do some work. Because the revs are low and the natural airflow high, there will be a low amount of load on the coupling, and thus it won't have stiffened up much, and won't overcool the motor or waste energy.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 3:27 am 
Getting Side Ways
Offline
User avatar

Age: 45

Posts: 3440

Joined: 23rd Dec 2007

Gallery: 32 images

Ride: BA XR6T (mix of BA, BF and FG)

Location: Perth
WA, Australia

I thought heat is transferred at least in part because the clutch is directly bolted to the pump shaft.. which is stirring your coolant..

we all know that metal ain't bad as a conductor of heat.. and 3 inches of metal shaft between the radiator coolant in the water pump to the clutch has got to transfer a decent bit of heat.

more heat, more friction more spinnies...

Our other car.. (Toyota Surf Hilux turbo diesel) is known for dodgy fans.. though these have a piece of metal that is heat reactive and locks the fan completely at a certain point so there is no slip. The metal fails and the viscous fluid needs a refill and the fan doesn't spin enough.. next thing you know.. cracked head. much pricier on a hilux diesel than a falcon.
Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 9:19 am 
Smokin em up
Offline

Posts: 243

Joined: 28th May 2008

Location: willawarin
NSW, Australia

naughtyfalcon wrote:
the clutch fan is a viscus fluid type,,it senses the speed of air moving over it and adjusts the fluid thickness to suite its needs,,IE: if it needs more air it thickens the fluid.

yes a new clutch will be needed.

you will have others tell you to change over to thermo fans,,but while they are good sometimes its just not worth the time and effort.

shame your in Melbourne,,i have two complete fans including blades ready to fit,,,

hope this helps


if wot im reading is correct mine is noisy and blowing clouds of dust at all times so its stuffed..how much would you charge for one of youres?
Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 11:50 am 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 1966

Joined: 13th Aug 2005

Ride: 2000 Au wagon

Location: some where in nsw
NSW, Australia

about $30 plus postage.

but i'd have to check em again,,there in the in-laws shed..

i'll get back to ya

 

_________________

Image

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 11:56 am 
Getting Side Ways
Offline
User avatar

Posts: 6168

Joined: 5th Nov 2004

i got three words... "Thermo Fan Conversion"

 

_________________

Image

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 12:37 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 3374

Joined: 11th Mar 2008

Ride: EA SVO, AU2 Forte

Location: Bendigo
VIC, Australia

Mitch_ wrote:
i got three words... "Thermo Fan Conversion"
exactly. i picked up some EL thermos yesterday. fitting them today

 

_________________

Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 12:42 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 1966

Joined: 13th Aug 2005

Ride: 2000 Au wagon

Location: some where in nsw
NSW, Australia

Mitch_ wrote:
i got three words... "Thermo Fan Conversion"


not every one wants to go throught the hassle of thermo fans

at least with the clutch fan its just take radiator out,,undo old clutch fan put new one on,,replace radiator taking advantage while its out to clean it all and reverse flush it.

 

_________________

Image

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 12:43 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 3374

Joined: 11th Mar 2008

Ride: EA SVO, AU2 Forte

Location: Bendigo
VIC, Australia

naughtyfalcon wrote:
Mitch_ wrote:
i got three words... "Thermo Fan Conversion"


not every one wants to go throught the hassle of thermo fans

at least with the clutch fan its just take radiator out,,undo old clutch fan put new one on,,replace radiator taking advantage while its out to clean it all and reverse flush it.
why is it a hassle
hook it up to a switch in the cabin. done

 

_________________

Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 12:49 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 1966

Joined: 13th Aug 2005

Ride: 2000 Au wagon

Location: some where in nsw
NSW, Australia

not quite the right way,,nuff said.

 

_________________

Image

Top
 Profile  
 
 
Posted: Sun Jun 29, 2008 1:16 pm 
Oompa Loompa
Offline
User avatar

Posts: 33

Joined: 30th Jan 2007

Ride: 1996 EFII Ford Falcon XR6

Location: Melbourne
VIC, Australia

Thanks for the replies guys,

Yeh i'm probably going to get thermos eventually, but I have to wait until the cash flow starts again.

 

_________________

1996 EFII Falcon XR6 - K&N Pod Filter - Otherwise stock as a rock

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 2  [ 17 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 13 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Tue Dec 12, 2017 4:47 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names