Electric fan instead of viscous fan???

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ratty said:
fook off. I had you behind me. The slower I drive the less damage you do when you forget to brake.;):p
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well ya know what to do next time then either drive behind me or stay home so you dont damage it (well maybe there is a flaw in that arguement as you did'nt do any lanes that were remotely damaging anyway :rolleyes:)
 
buckshot said:
dont evade the point you bottled it :rolleyes:
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Nope. My landy is more than just a toy. I decided that if I ran out of grunt while driving it than I would be in the ****. Rather than put my vehicle or anyone elses at risk I decided not to do it. I stand by my decision and would do the same again. Imagine what it would be like to smash yer landy up and then have to go through the grief of an insurance claim and then finding another one.;):p:p:p
 
discool said:
Why a viscous fan is always slipping, and therefore saving energy, (as it should) unless required is because of the ram efect of air passing through the rad when the vehicle is moving forward, it's only when there is little ram effect does the fan take over just like an electric fan would.
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Another interesting theory. That is, it is the ram effect of the air coming through the radiator that engages or disengages a viscous fan. You might want to look up whether it is actually heat that engages it.

Also if your fan is slipping all the time, I suggest that you get a new one.
 
Yeah I was working on my dads car to replace the electric aircon fan, and it's quite obvious if you leave the engine ticking over for long enough that the viscous fan all of a sudden locks up and starts pulling, and then soon after loosens off again.

I don't think it's the counter rotation from ram air that unlocks it, besides there's nowhere near enough to turn it compared to how fast the engine's turning.

To answer the OP I'm saying viscous fan for fit and forget, electric fan for more risk but more benefit, however you choose to use the car.

Cheers :)
 
p76rangie said:
Another interesting theory. That is, it is the ram effect of the air coming through the radiator that engages or disengages a viscous fan. You might want to look up whether it is actually heat that engages it.

Also if your fan is slipping all the time, I suggest that you get a new one.
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I will call that interesting theory No.2 :D

I understand it's heat that engages the fan that's why the rotation is stiff when cold but changes in a 100 yards or so and then when the engine gets stiffen up again and this change with the fan can ge heard. There's loads of info, which i'm going to look at on the www.
If the viscous fan slips 'all the time' it's indeed time to replace it.
 
Last edited:
Just an update. I recently returned from Wales towing my 1.2 ton caravan minus the viscous fan [it was in the boot]. The temp gauge didn,t move from the midway position , even when pulling up that mountain at Rault north Wales at 3000 revs second gear :eek:.Low fuel light came on at 430 miles and that was about 260 miles towing the van the rest solo trips out.
 
That is a bugger that hill!!

We had a p38 diesel manual and we were towing a 30ft boat, about 3.5 ton officer :)

Anyway, had to do the hill in first, 10mph.

The clapped out old diesel wouldn't pull it in second!!
 
Mr Noisy said:
That is a bugger that hill!!

We had a p38 diesel manual and we were towing a 30ft boat, about 3.5 ton officer :)

Anyway, had to do the hill in first, 10mph.

The clapped out old diesel wouldn't pull it in second!!
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Thats made me feel much better about my 35 mph flat out at Rhault ! I tried to do it in third by holding the revs at 2500 but the auto box dropped into second and the revs screamed up ! Makes you feel like your stood still when cars are passing you doing 80 :D
 
Yeah it's not your fault mate. My v8 struggles up any kind of hill above 3rd gear, perhaps cos of the 33" Tyres. Even so, it suprises me how hopeless it is on the motorway!
 
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