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renegade334
Fordmods Oompa Loompa
Posts: 30
Joined: 30 Jan 2007
Location: Melbourne VIC, Australia
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 Posted: Sat Jun 28, 2008 2:37 am Post subject: Clutch Fan |
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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 |
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naughtyfalcon
Fordmods - Getting Side Ways
Age:40
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Location: some where in nsw NSW, Australia
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| Posted: Sat Jun 28, 2008 8:46 am Post subject: |
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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 |
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Disco Frank
Fordmods Junkie
Age:29
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Location: Perth WA, Australia
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| Posted: Sat Jun 28, 2008 11:10 am Post subject: |
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| 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.
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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 |
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naughtyfalcon
Fordmods - Getting Side Ways
Age:40
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| Posted: Sat Jun 28, 2008 1:42 pm Post subject: |
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| well half right ffs |
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relaxed_diplomacy
Fordmods - Getting Side Ways
Age:33
Posts: 939
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Location: delegate NSW, Australia
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| Posted: Sat Jun 28, 2008 9:29 pm Post subject: |
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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. |
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frankieh
Fordmods - Getting Side Ways
Age:36
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Location: Perth WA, Australia
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| Posted: Sun Jun 29, 2008 2:27 am Post subject: |
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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. |
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familyhack
Fordmods Stock as a Rock
Posts: 105
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Location: willawarin NSW, Australia
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| Posted: Sun Jun 29, 2008 8:19 am Post subject: |
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| 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? |
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naughtyfalcon
Fordmods - Getting Side Ways
Age:40
Posts: 1752
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| Posted: Sun Jun 29, 2008 10:50 am Post subject: |
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about $30 plus postage.
but i'd have to check em again,,there in the in-laws shed..
i'll get back to ya |
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Mitch_
Cruise Moderator
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| Posted: Sun Jun 29, 2008 10:56 am Post subject: |
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| i got three words... "Thermo Fan Conversion" |
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WILDEB
Fordmods - Smokin em up
Age:19
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Location: Bendigo VIC, Australia
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| Posted: Sun Jun 29, 2008 11:37 am Post subject: |
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| Mitch_ wrote: | | i got three words... "Thermo Fan Conversion" |
exactly. i picked up some EL thermos yesterday. fitting them today |
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naughtyfalcon
Fordmods - Getting Side Ways
Age:40
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| Posted: Sun Jun 29, 2008 11:42 am Post subject: |
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| 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. |
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WILDEB
Fordmods - Smokin em up
Age:19
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Location: Bendigo VIC, Australia
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| Posted: Sun Jun 29, 2008 11:43 am Post subject: |
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| 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 |
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naughtyfalcon
Fordmods - Getting Side Ways
Age:40
Posts: 1752
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| Posted: Sun Jun 29, 2008 11:49 am Post subject: |
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| not quite the right way,,nuff said. |
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renegade334
Fordmods Oompa Loompa
Posts: 30
Joined: 30 Jan 2007
Location: Melbourne VIC, Australia
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| Posted: Sun Jun 29, 2008 12:16 pm Post subject: |
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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. |
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WILDEB
Fordmods - Smokin em up
Age:19
Posts: 298
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Location: Bendigo VIC, Australia
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| Posted: Sun Jun 29, 2008 12:38 pm Post subject: |
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| naughtyfalcon wrote: | | not quite the right way,,nuff said. |
pff and? works |
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relaxed_diplomacy
Fordmods - Getting Side Ways
Age:33
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Location: delegate NSW, Australia
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| Posted: Sun Jun 29, 2008 7:42 pm Post subject: |
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| familyhack wrote: | | 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? |
Sounds like it's working fine to me. I've never heard of them going solid, but even if it has that's a hell of a lot better than the fluid degrading and the fan not doing the job of cooling the motor. Cars used to have solid fans, all that did is waste a bit of energy sometimes, and make more noise, and chew the radiator if you drove through deep water. In fact, a radiator specialist advised me to make my dud one solid, rather than buy a new one. But as i say, i've never heard of them going solid, but a radiator specialist would know heaps more than me about this.
To restate what i said earlier, viscous coupling's become more solid the hotter they get. They get hotter when the air passing over them is hotter, when the shaft they are on is hotter, and i reckon they mostly get hotter when the difference between the shaft speed and the fan speed is greatest.
Imagine a coupling that worked the other way. Imagine a coupling that offered less and less airflow the longer the motor sat there idling, for example. That would be no good.
We want more airflow the hotter things get, so we want more resistance within the coupling's fluid the hotter things get. |
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