R32 GT-R Viscous fan *urgent help needed* - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

humanizer · 15th July 2005, 01:38 PM

Hi,

Is the Viscous fan the same on other nissan cars? Like 200sx S13, S14? Mine is loose/gaping. And it sounds funny. Im scared that it will be released in the engine bay

So please tell me, Are the viscous fans the same on other Nissan cars? THat would make it easier to find one around here in Sweden.

ThanX!!

Johnny Norberg

Chris Wilson · 15th July 2005, 03:42 PM

GTS-t ones are the same, or at least fit and work fine. it is VERY unlikely to come off, it will either seize solid or just free wheels, seizing at least keeps things cool....

lightspeed · 15th July 2005, 09:54 PM

A few years back a friend of mine had one on an E30 325i sport where the bimetallic strip failed and the fan was permanently on. The water pump couldn't take the thrust loading and the impeller almost machined its way out of the housing.

Matt_S · 16th July 2005, 12:14 AM

Ive got at least 3 spare here if you need one

MrRoboto · 16th July 2005, 09:55 PM

My old one managed to put a nice arc shape in my radiator once under full throttle. Turns out the plastic was cracked, and the fan became unbalanced.

So definitely check for cracks in the fan. And look at how much the fan moves back and forth in the engine bay when you play with the throttle.

NISFAN · 16th July 2005, 10:41 PM

Quote:

Originally Posted by lightspeed

A few years back a friend of mine had one on an E30 325i sport where the bimetallic strip failed and the fan was permanently on. The water pump couldn't take the thrust loading and the impeller almost machined its way out of the housing.

You definately don't want to use a siezed fan, as it turns faster than engine speed due to the pulley ratio. There is no way a fan can run at 8000+rpm without something giving. More thrust than an RB211

Replace it quick.

Chris Wilson · 17th July 2005, 09:14 AM

Andy Middlehursts R32 race car did loads of 12 and 24 hour races with the viscous coupling locked up, it was the only way to get reliable cooling, nothing failed

NISFAN · 17th July 2005, 09:25 AM

Quote:

Originally Posted by Chris Wilson

Andy Middlehursts R32 race car did loads of 12 and 24 hour races with the viscous coupling locked up, it was the only way to get reliable cooling, nothing failed

The thrust of a fan is inversly proportional to the speed of the airstream. On a racing car travelling at high speed the thrust will be relatively low. On a road car in stop start situations, very high = failed water pump bearings. The very reason for the viscous coupling in the first place. I'm sure the likes of Nissan wouldn't pay for a costly item like a visc coupling, if the old 4 bladed direct drive fan would do.

steve930 · 17th July 2005, 09:44 AM

you couls also ditch the fan completely, and fit an electric kenlowe unit or similar.

The kenlowe ones have their own adjustable thermostatic switch, so you can adjust at what temp the fan turns on & off.

By ditching the viscous unit you are also gonna be reducing the rotating mass on the front of the engine, which can only be a good thing

Chris Wilson · 17th July 2005, 08:54 PM

Viscous couplings are designed to meet three main criteria, faster engine warm up (in pursuit of emissions control and fuel economy), less fan noise, and less power drain on the engine (better economy and performance from a given engine size and efficiency). The axial thrust capabilities of even the most basic ball bearings of the size found in a typical water pump will laugh at a fans thrust, even when driven at full engine speed or above.

Noise was probably the first reason an engine driven fan was given attention. The old flexible bladed fans came first, then the French favoured electromagnetic clutches on Peugeots and others, then the viscous coupling latterly found favour for cost, simplicity and reliability

An electric motor driven fan would have to have a motor the size of an alternator, with a massive current draw to shift similar volumes of air to that of the equivalent sized engine driven fan. The very small frontal aperture areas of modern cars means the cooling fan is very important as ram effect is nothing like that of older cars with their relatively massive grille apertures, the smaller openings being in pursuit of less drag (better MPG and top speed). Very few front engined cars solely use an electrically driven cooling fan, I think you will find.

rockabilly · 17th July 2005, 09:06 PM

got to agree with chris. you will never find an electric fan than can draw/push the amount of air an engine fan can move. replace the original with the same. just my 2p worth..bernie.

aki · 25th July 2005, 05:50 PM

has anyone on here converted from visc fan to electric, i read some where that many big power drag GTR's just get rid of the normal fan and go for an electric one?

NISFAN · 25th July 2005, 06:00 PM

Quote:

Originally Posted by Chris Wilson

Very few front engined cars solely use an electrically driven cooling fan, I think you will find.

I'll bet £1000 pounds that the majority of front engined cars sold in the UK have electric fans only.............any takers?

GTR-Zilla · 25th July 2005, 06:20 PM

RK uses electric fans on his cars, and even sells a kit, speaking to him hes never had any problems with them. I believe the electric fan is a good replacemnt, lots of sports cars, with v8's etc seem happy with electric fans...

humanizer · 31st July 2005, 10:25 PM

I convert to electric fan now. I will keep you posted on how it works in my R32 GT-R.

Regards,
Johnny

15th July 2005, 01:38 PM	#1 (permalink)
humanizer GTR Register Member Join Date: Jul 2005 Posts: 23	R32 GT-R Viscous fan urgent help needed Hi, Is the Viscous fan the same on other nissan cars? Like 200sx S13, S14? Mine is loose/gaping. And it sounds funny. Im scared that it will be released in the engine bay So please tell me, Are the viscous fans the same on other Nissan cars? THat would make it easier to find one around here in Sweden. ThanX!! Johnny Norberg

17th July 2005, 09:06 PM	#11 (permalink)
rockabilly rb30 710bhp Join Date: Oct 2003 Location: lancashire Posts: 1,102	got to agree with chris. you will never find an electric fan than can draw/push the amount of air an engine fan can move. replace the original with the same. just my 2p worth..bernie. __________________ fancy the south of france. http://st-tropez.mysite.orange.co.uk/

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15th July 2005, 03:42 PM	#2 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,557	GTS-t ones are the same, or at least fit and work fine. it is VERY unlikely to come off, it will either seize solid or just free wheels, seizing at least keeps things cool....

15th July 2005, 09:54 PM	#3 (permalink)
lightspeed GTROC Member Join Date: Jul 2002 Location: South-west Posts: 1,812	A few years back a friend of mine had one on an E30 325i sport where the bimetallic strip failed and the fan was permanently on. The water pump couldn't take the thrust loading and the impeller almost machined its way out of the housing.

16th July 2005, 12:14 AM	#4 (permalink)
Matt_S GTR Register Member Join Date: Apr 2002 Location: Essex of course Posts: 553	Ive got at least 3 spare here if you need one

16th July 2005, 09:55 PM	#5 (permalink)
MrRoboto GTR Register Member Join Date: Oct 2003 Location: Honkers Posts: 25	My old one managed to put a nice arc shape in my radiator once under full throttle. Turns out the plastic was cracked, and the fan became unbalanced. So definitely check for cracks in the fan. And look at how much the fan moves back and forth in the engine bay when you play with the throttle.

17th July 2005, 09:14 AM	#7 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,557	Andy Middlehursts R32 race car did loads of 12 and 24 hour races with the viscous coupling locked up, it was the only way to get reliable cooling, nothing failed

17th July 2005, 09:44 AM	#9 (permalink)
steve930 GTR Register Member Join Date: Feb 2005 Location: weymouth, dorset Posts: 166	you couls also ditch the fan completely, and fit an electric kenlowe unit or similar. The kenlowe ones have their own adjustable thermostatic switch, so you can adjust at what temp the fan turns on & off. By ditching the viscous unit you are also gonna be reducing the rotating mass on the front of the engine, which can only be a good thing

17th July 2005, 08:54 PM	#10 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,557	Viscous couplings are designed to meet three main criteria, faster engine warm up (in pursuit of emissions control and fuel economy), less fan noise, and less power drain on the engine (better economy and performance from a given engine size and efficiency). The axial thrust capabilities of even the most basic ball bearings of the size found in a typical water pump will laugh at a fans thrust, even when driven at full engine speed or above. Noise was probably the first reason an engine driven fan was given attention. The old flexible bladed fans came first, then the French favoured electromagnetic clutches on Peugeots and others, then the viscous coupling latterly found favour for cost, simplicity and reliability An electric motor driven fan would have to have a motor the size of an alternator, with a massive current draw to shift similar volumes of air to that of the equivalent sized engine driven fan. The very small frontal aperture areas of modern cars means the cooling fan is very important as ram effect is nothing like that of older cars with their relatively massive grille apertures, the smaller openings being in pursuit of less drag (better MPG and top speed). Very few front engined cars solely use an electrically driven cooling fan, I think you will find.

25th July 2005, 05:50 PM	#12 (permalink)
aki GTR Register Member Join Date: May 2003 Location: NE Posts: 232	has anyone on here converted from visc fan to electric, i read some where that many big power drag GTR's just get rid of the normal fan and go for an electric one?

25th July 2005, 06:20 PM	#14 (permalink)
GTR-Zilla Banned Join Date: May 2005 Location: London Posts: 2,099	RK uses electric fans on his cars, and even sells a kit, speaking to him hes never had any problems with them. I believe the electric fan is a good replacemnt, lots of sports cars, with v8's etc seem happy with electric fans...

31st July 2005, 10:25 PM	#15 (permalink)
humanizer GTR Register Member Join Date: Jul 2005 Posts: 23	I convert to electric fan now. I will keep you posted on how it works in my R32 GT-R. Regards, Johnny