jammy_basturd
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| posted on 29/1/08 at 11:24 AM |
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Really small cooling fans (like 5")?
I have quite a specialist application for my Mini kit car. I've found some Forumla First aux radiators to use, which are perfectly sized to fit
in my engine bay, the only problem is that they measure 55x12.5x6cm. So I need 2-3 very small cooling fans that are roughly 12.5cm in diameter!
I had thought about computer fans, but I doubt they'll shift enough air. Anybody think of another solution?
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twybrow
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| posted on 29/1/08 at 11:26 AM |
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Inline fans for air handling? Not sure of the voltage however... Computer fans do move quite a lot of air - maybe a few of them in series?!
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02GF74
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| posted on 29/1/08 at 11:36 AM |
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motorcycle rad fans.
beware of using very samll fans as the motor to fan diamter is large so are not as efficitent as larger bladed fan.
you say radiators - plural implying more than one - can you not mount thenm nbext to each other and have a larger fan that overlaps tham?
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Guinness
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| posted on 29/1/08 at 11:36 AM |
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Have a look on ebay at motorbike cooling fans. Should be about the right side.
Cheers
Mike
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jammy_basturd
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| posted on 29/1/08 at 11:41 AM |
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A couple of weeks ago I was looking at motorbike rads, can't believe I didn't think of using the fans!
I have two of the radiators, but not quite sure whether I'll need to use both (only needs to cool a slightly modified 1275 Mini engine). I have
inboard coilovers, one of which is right where the standard side rad and fan would be. One of these rads will be placed in front of the cylinder head,
unfortunately I can't put the other one below it because of the starter motor and part of the subframe.
Thanks for your help again, will look at some motorbike rads now.
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dhutch
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| posted on 29/1/08 at 12:07 PM |
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What about some 120mm computer fans.
- There about 12cm, run nicely on 12-14vdc.
- And if you get the right ones shift plenty of air.
You can even get twin (counter rotating) blade versions of some.
People used them on raditors (often car heater exhangers) on water cooled rigs.
Daniel
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jammy_basturd
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| posted on 29/1/08 at 12:13 PM |
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You might have just hit the bullseye!  Found this listing on Ebay, which I think might just be perfect...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280196135762
[Edited on 29/1/08 by jammy_basturd]
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Bob C
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| posted on 29/1/08 at 12:43 PM |
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putting fans in series will only up the pressure if each fan in sequence turns the other way (i.e. right hand thread, then left hand thread, then
right hand thread etc.). You can put 6 in series going the same way & you'll only get the pressure of 1.
Putting fans in series increases the pressure. Against a restriction this will increase flow. If there is only a small, or no restriction you get no
benefit.
These are results of measurements I took for a satellite ground station amplifier project (i.e. not just heresay)
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r1_pete
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| posted on 29/1/08 at 01:03 PM |
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quote:
Originally posted by jammy_basturd
You might have just hit the bullseye! Found this listing on Ebay, which I think might just be perfect...
Make sure the auction is for all three though, reads like it is, but best check.
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owelly
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| posted on 29/1/08 at 02:34 PM |
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I used an air-con fan when the one on my bike broke! There were no bike breakers around here but plenty of car yards!
http://www.ppcmag.co.uk
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02GF74
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| posted on 29/1/08 at 02:45 PM |
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quote:
Originally posted by dhutch
What about some 120mm computer fans.
I am not so sure. A nice warm and dry office environment is a different kettle of which comapred to under a car bonnet.
I did look into this as I wanted to put some fans onto an oil coller (and by the way, thinkauto.com do them but not locoast for me). and tyou can get
waterproof version of these 12 V fans, pity I donlt have the details anymore.
If you have space, use a larger fan and make a duct from the radiator to the fan.
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dhutch
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| posted on 29/1/08 at 06:23 PM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by dhutch
What about some 120mm computer fans.
I am not so sure. A nice warm and dry office environment is a different kettle of which comapred to under a car bonnet..
Yeah, well i cant say ive tryed using them on a car!
However they far fairly robust, and being brushless like normal rad fans, you could always take the fan/hub off and epoxy seal them.
- That said, people use them as extractor fans in bathrooms of narrowboats, where they get cold/wet/rained on and seam to manage for years.
Daniel
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jammy_basturd
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| posted on 30/1/08 at 12:11 PM |
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Well those three fans are currently on their way to me, got them for £25 posted which I don't think is a bad price. Will look into how weather
proof they are, might use some silicon sealant around the casing...
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