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

Quite often you can simply reverse the polarity of the power and reverse the fan blades, making it a 'push' version.

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.

quote:

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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.

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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.

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]

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.

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.

Citroen Dyane and 2CV (if you can find any that haven't fallen apart) have fans in front of the rad. Cheers, Pewe

quote:

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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]

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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

quote:

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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.

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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!

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!)