AuthorTopic: what size fan can i get away with?  (Read 2780 times)

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Offline generation-x

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what size fan can i get away with?
« on: August 17, 2010, 10:31:18 »
lookin to bin the viscus fan on my 3.9 rrc would a 13 inch leci fan be enuf to keep her cool? Fan would be infront of the rad to push cold air throu? Simon

Offline generation-x

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Re: what size fan can i get away with?
« Reply #1 on: August 17, 2010, 21:54:20 »
Anyone??? [-o<

Offline gingernutsv8

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Re: what size fan can i get away with?
« Reply #2 on: August 18, 2010, 10:25:36 »
has it got aircon
If it ain't broke hit it with a big hammer then it will be.

Offline generation-x

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Re: what size fan can i get away with?
« Reply #3 on: August 18, 2010, 13:14:49 »
no buddy just need's to keep the engine cool :) simon

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Re: what size fan can i get away with?
« Reply #4 on: August 18, 2010, 13:16:25 »
if it had aircon you could use them fans
If it ain't broke hit it with a big hammer then it will be.

Offline ChrisW70

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Re: what size fan can i get away with?
« Reply #5 on: August 18, 2010, 13:18:19 »
15" single or twin smaller ones..? MM4x4 offer a 15" for V8's but 'not recommended for heavy off road use'

http://www.mm-4x4.com/15-inch-electric-fan-kit---all-land-rovers-4-cyl--v8-688-p.asp
Chris W

West Midlands Region GLASS Rep
GLASS TRO Officer

Offline generation-x

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Re: what size fan can i get away with?
« Reply #6 on: August 18, 2010, 15:41:05 »
cheers guys looks like try to tat yard then for pair of pug205 fans :-) thanx simon

Offline Range Rover Blues

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Re: what size fan can i get away with?
« Reply #7 on: September 01, 2010, 00:46:25 »
Ducato van has a big fan.

BUT, I rang Kenlowe and spoke to their applications engineer.  He advised me NOT to swap the Viscous for electric.  Aviscous fan will shift twice as much air as a pair of 12" HD fans (you can't fit 2 13" IIRC) but basically the biggest fans they sell that fit will not do the job as well as a sorted vsicous.

So I bought a new viscous and rad, my car has been sorted since, well cooling wise anyway.
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Offline generation-x

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Re: what size fan can i get away with?
« Reply #8 on: September 01, 2010, 20:34:44 »
Ducato van has a big fan.

BUT, I rang Kenlowe and spoke to their applications engineer.  He advised me NOT to swap the Viscous for electric.  Aviscous fan will shift twice as much air as a pair of 12" HD fans (you can't fit 2 13" IIRC) but basically the biggest fans they sell that fit will not do the job as well as a sorted vsicous.

So I bought a new viscous and rad, my car has been sorted since, well cooling wise anyway.


RRB

ok :oops: viscus fan has been binned
main  issue is the way the front end is now a standard viscus wont work as it hits the :oops: bonnet

got a pair of 13" leci fans on the front


only issue now is i cant find a 12volt feed
every feed i find goes to 14volts when engine is runnin
so im not sure wot im gonna do


Simon

Offline doda456

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Re: what size fan can i get away with?
« Reply #9 on: September 02, 2010, 13:45:18 »
Any of the 14 volt feeds will be fine.     Its becasuea car electrical sytem is 12v nominal and max 14.4v

The 14.4v is  the alternator output, as batteries have to be charged at slightly above the rated voltage.


If you put a meter across the battery without the engine running it will read 12.4, with the engine running it should be between 14v and 14.4v





Offline Bowie

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Re: what size fan can i get away with?
« Reply #10 on: September 03, 2010, 08:56:55 »
Find an ignition live and relay a fused supply striaght from the battery, don't just connect them up to any +12V wire you find!
1980 SIII Lightweight 2.25 Petrol - completely standard.
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Offline Range Rover Blues

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Re: what size fan can i get away with?
« Reply #11 on: September 05, 2010, 14:11:45 »
Wire the fans straight onto the battery via a realy.  The relay can be fed with either battery or ignition supply via your thermostat switch.  When you turn off the engine parts of the cooling system get hotter, so you may find the fans come on once you switch off the engine, this is normal and will help prevent the oil from being over-heated in the heads and other such problems.  The V8 runs best at around 65 degrees but for emissions regs the later onces run at 85 or higher.  You don't want the engine getting any hotter than that.
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Offline M6GKX

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Re: what size fan can i get away with?
« Reply #12 on: September 07, 2010, 20:54:26 »
Many moons ago a friend with a 4203 perkins diesel in his series would have occasional cooling issues whilst winching. What he did was on a corner of the radiator he fitted a smaller faster fan from a Vauxhall Nova. Switching it on gave cooling results almost immediately. I think he kept that installed until it was sold.

Hopefully the two 13" fans you've fitted will do the job ;) The viscous unit on my V8 Defender is a tad old and whilst I've had issues I have found that carefully hosing out the radiator, oil cooler and a/c radiator too. Certainly helped :)

 






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