jabbahutt
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 posted on 4/2/07 at 11:56 AM |
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radiaotr fan position
I've been reading the threads and would be grateful for some confirmation.
Just about to fit a VW302 radiaotr into my Indy. A lot of people seem to opt for fitting the radiaotr to the front of the rad.
I've also noticed that the fans from CBS seem to be used a lot.
If anyone would be kind enough to confirm whether their rad is mounted on the front or the rear I'd be grateful.
Also if anyone has used fans from CBS where they happy with them, ease of fitting, how they performed and what size fan did you use.
Many thanks for your time.
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John Bonnett
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| posted on 4/2/07 at 01:42 PM |
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I've always used fans from scrappers and make up suitable mounts. For the Phoenix, I'm using one from a Peugeot 205 mainly because I have
a 205 MOT failure so in effect it's a source of free parts. These fans push and for my set-up where there is no space behind the radiator a
pusher is ideal.
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RazMan
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| posted on 4/2/07 at 03:09 PM |
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I have got a Pacer fan pulling through the rad. My theory is that I get better airflow because the fan is not blocking part of the rad to start with.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Confused but excited.
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| posted on 4/2/07 at 03:53 PM |
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To my way of thinking, the air in front of a fan is less dense than the air behind it, as the air behind it is slightly compressed.
Denser air will absorb more heat as it has a greater thermal capacity.
Therefore logic dictates that a front mounted fan should be more effective.
The fan itself when non-operational will restrict airflow through the fan wether it is at the front or the rear of the radiator equally.
Although I am happy to be corrected by more knowlegeable sages on here.
Tell them about the bent treacle edges!
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RazMan
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| posted on 4/2/07 at 04:21 PM |
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Ah but the air will be deflected somewhat if the fan is in front of it, therefore reducing the cooling efficiency of the rad core. When the air has
gone through the rad, it doesn't matter so much which direction it travels in as long as it is taking the heat away with it.
I'm probably talking rubbish though as I have forgotten most of my college physics 30 odd years ago
[Edited on 4-2-07 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Humbug
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| posted on 4/2/07 at 05:47 PM |
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I've got a Polo rad with a CBS fan behind it, so pulling through. I put the fan behind for the same reasons as RazMan mentioned - it seemed like
it would not be diverting any airflow from the rad. Also, IMHO it looks better.
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robertst
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| posted on 4/2/07 at 06:13 PM |
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i have read many times already that it doesnt matter where the fan is, the cooling efficiency will be the same.
in my opinion, i have decided to put a sucker rather than a blower as i dont really want my fingers or children's fingers cut off if they (or
me) ever want to fiddle around the grille area.
i just have this feeling that it is safer in that way...
Tom
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