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sean
 Post subject: which fan
PostPosted: Sun Feb 20, 2005 10:34 pm 
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848cc
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Joined: Thu Jan 20, 2005 1:22 am
Posts: 267
Location: Perth
which fan will cool the best ? I have a 16 blade metal one and a 12 blade plastic one. HoweverI was looking under the bonnet of a racing cooper s at the weekend and saw it used a 2 blade metal one please help ?

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supercharged 850
 Post subject:
PostPosted: Sun Feb 20, 2005 11:09 pm 
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1275cc
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Joined: Wed Mar 17, 2004 12:16 am
Posts: 5717
Location: Adelaide SA Ausmini Sales Department
The 2 blade fan is basically half of a 4 blade fan. The reason for only using 2 of the blades is that the racing mini is mostly driven at high speeds. At high speeds, a 2 blade fan allows more air to pass thru the radiator as it is forced thru the grill. When stopped, this racing mini will overheat easier.

If the racing mini was to use a 16 or 12 blade fan, the air would actually be blocked by the blades at racing speeds, essentialy making the engine run hotter.

If you do alot of city/slow driving/peak hour crawls, the 12 or 16 blade fan is your best bet. On country roads at high speed, especially in summer, a 4 blade fan is better.

A mini's fan only uses up about 3/4 of a horsepower, so less blades wont really affect the power.

I hope you can understand this, I cant think of a better way to describe it....

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sean
 Post subject:
PostPosted: Sun Feb 20, 2005 11:41 pm 
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848cc
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Joined: Thu Jan 20, 2005 1:22 am
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Location: Perth
So metal or plastic then as i have both

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Mike
 Post subject:
PostPosted: Mon Feb 21, 2005 7:26 am 
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Joined: Tue Mar 16, 2004 10:39 pm
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Location: Sydney, E. Burbs
I think the accepted dogma is that the multi blade plastic one is better shaped allowing better airflow to the radiator
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drmini in aust
 Post subject:
PostPosted: Mon Feb 21, 2005 7:36 am 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
But, the plastic one IS noiser than the 16 bladed metal one. Plastic ones also do fling blades off.
Whatever.. I run one of each... 8)

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simon k
 Post subject:
PostPosted: Mon Feb 21, 2005 11:39 am 
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Joined: Wed Sep 08, 2004 9:27 pm
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Location: Wodonga - Vic/NSW border
no fan - yay!!! get an electric one ;)

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Rupert
 Post subject:
PostPosted: Mon Feb 21, 2005 12:23 pm 
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Joined: Tue May 25, 2004 8:07 am
Posts: 188
Location: Cordalba, Queensland
I would use the Tropical fan that was availavle on export minis to hot climates.

Don't use the white plastic fan. These are the ones that have a tendancy to explode.

If you only have the yellow 16 blade fan or the yellow plastic I'd use the plastic.
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1380 yellow devil
 Post subject:
PostPosted: Mon Feb 21, 2005 1:09 pm 
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Joined: Tue Mar 23, 2004 9:52 pm
Posts: 874
Location: Bundaberg QLD
Yeap I have a Plastic one on mine and now troubles.

I have seen the 4 Blade Rally type fan crack and go through the rad.

Nasty surprise when you have to do a rad and a fan.

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