diyer
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| posted on 27/6/07 at 06:41 AM |
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radiator fan
Hi all,
Anyone know a vehicle application that has a 'push' fan, i need a fairly powerful one around the 12" mark.
I know pull fans are more common.
thanks
Simon
Hug a Hoodie!
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RazMan
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| posted on 27/6/07 at 07:05 AM |
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Quite often you can simply reverse the polarity of the power and reverse the fan blades, making it a 'push' version. 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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fesycresy
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| posted on 27/6/07 at 07:47 AM |
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TimC bought one from SVC - they have the two types. Maybe £40 ?
You're right in saying that reversing the polarity will run the motor backwards, but the angle of the impellers will reduce volume flow.
Lyn.
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The sooner you fall behind, the more time you'll have to catch up.
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David Jenkins
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| posted on 27/6/07 at 07:53 AM |
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quote:
Originally posted by fesycresy
You're right in saying that reversing the polarity will run the motor backwards, but the angle of the impellers will reduce volume flow.
But on many models you can undo 1 nut and turn the fan over... as stated above.
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fesycresy
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| posted on 27/6/07 at 07:58 AM |
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I'm a dull arse.
Sorry RazMan, I read the post too quick and missed the 'reverse the blades' part.
Lyn.
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The sooner you fall behind, the more time you'll have to catch up.
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nitram38
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| posted on 27/6/07 at 10:05 AM |
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The really highly efficient fans cannot have their polarity reversed or the fan blade flipped over as the blades are designed for max flow and are
curved.
Buy yourself a decent fan from svc (pacet) as low cfm rates might cause you problems.
This is my fan and it goes in front of the rad. Pacet from svc:
 
rad plus pacet fan
[Edited on 27/6/2007 by nitram38]
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02GF74
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| posted on 27/6/07 at 12:02 PM |
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Ford Mondeao is the anwer to your troubles. (may be more than 12 inch - I can measure tonight oif it is important)
I can best describe a lot of fans as hainvgtin a moulded cup onto whcih the blades attach - you cannot change the blades round.
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RazMan
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| posted on 27/6/07 at 12:09 PM |
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I have done this on a couple of different fans - you simply unbolt the fan assembly and reverse it. I didn't want any obstructions stopping
airflow to the rad so I just mounted it on the back of the rad after reversing the polarity & fan - it certainly hasn't harmed cooling at
all and keeps my V6 cool with only a Polo rad.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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pewe
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| posted on 27/6/07 at 04:48 PM |
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Citroen Dyane and 2CV (if you can find any that haven't fallen apart) have fans in front of the rad. Cheers, Pewe
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James
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| posted on 27/6/07 at 05:04 PM |
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quote:
Originally posted by nitram38
The really highly efficient fans cannot have their polarity reversed or the fan blade flipped over as the blades are designed for max flow and are
curved.
Buy yourself a decent fan from svc (pacet) as low cfm rates might cause you problems.
This is my fan and it goes in front of the rad.
[Edited on 27/6/2007 by nitram38]
Agree with Nitram here, expensive fans have curved blades optimised for air flow, and you'll lose this if you reverse the blades and
polarity.
After a lot of research I went for a Pacet one (supplied by Rally Design) as well.
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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TangoMan
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| posted on 27/6/07 at 07:06 PM |
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diyer,
I have one in the garage which I replaced for a pull type.
I am travelling to Bedworth on Saturday (maybe Friday night) and can bring it with me if you are interested.
Yours for the princely sum of........ nowt 
Summer's here!!!!
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RazMan
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| posted on 27/6/07 at 08:57 PM |
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quote:
Originally posted by James
Agree with Nitram here, expensive fans have curved blades optimised for air flow, and you'll lose this if you reverse the blades and
polarity.
But that is precisely why you must reverse the fan assembly - to keep the correct profile for the reversed direction. You end up with exactly the same
fan .... just running in the direction you need  Unless you are thinking of something else?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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bimbleuk
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| posted on 28/6/07 at 07:46 AM |
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Got to agree with Raz as my Merlin sourced fan is curved and I've reversed the polarity and flipped the fan blades. Also my tip of the day is to
rub down the blade edges and get rid of any sharp edges or flashing. Can make a noticeable difference to the noise generated and I assume increases
the efficiency by a tiny amount!
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Mark Allanson
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| posted on 28/6/07 at 09:53 PM |
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Peugeot 406 diesels, a massive 400W fan, if I manually switch mine I can get from near overheating to cold in 200yds! If turned on while stationary,
the car moves forward very slowly (slight exageration, but REALLY powerful!)
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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