mad4x4
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| posted on 8/6/04 at 03:55 PM |
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Electric Fan
How does the sva want this wired- Can it run when the ingition etc is off.
Do I need to put a stiker saying that it will?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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Hellfire
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| posted on 8/6/04 at 04:08 PM |
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I don't recall any regulations stating when it should run. We've wired our's as an after-run system, ie straight to permanent live
as most modern cars are. We have a 061 Ford Battery for supply tho'. Just a thought!
No sticker either - but we considered wiring a light inline, so that you know when it is running.
Some have included a permanent switch for track days, which might be a good idea.
[Edited on 8-6-04 by Hellfire]
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zetec
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| posted on 8/6/04 at 06:06 PM |
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I don't think it matters. Production cars do both ways. If you run from ignition switch might be worth fitting a relay as they draw a fair
current on start up. Presume you are also fitting temp switch or engine may never get up to correct temp. Mine only runs when standing still for 3-4
mins, never while driving.
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David Jenkins
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| posted on 8/6/04 at 07:42 PM |
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In 'real' cars they usually wire the fan to the permanently live side - thermostat activates a relay, and the relay switches the fan on.
This means that if the thermostat reckons the water is too hot, the fan will come on to cool things down. This gets rid of some of the excess heat
after the engine's switched off and the water pump's stopped.
just my 2p's worth!
David
[Edited on 8/6/04 by David Jenkins]
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JoelP
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| posted on 8/6/04 at 08:59 PM |
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thats how mine is wired. i may add a relay, though the donor (polo) didnt have one. plus the obligatory bypass for when you see trouble coming.
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David Jenkins
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| posted on 9/6/04 at 07:36 AM |
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quote:
Originally posted by JoelP
thats how mine is wired. i may add a relay, though the donor (polo) didnt have one. plus the obligatory bypass for when you see trouble coming.
We had this debate a long while back - if you KNOW that your thermostat has high-current contacts then you don't need a relay, otherwise
it's worth putting one in.
David
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mad4x4
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| posted on 9/6/04 at 08:15 AM |
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Does the Ford "XR2" thermostate switch have high current contacts?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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JoelP
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| posted on 9/6/04 at 08:32 AM |
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quote:
Originally posted by David Jenkins
We had this debate a long while back - if you KNOW that your thermostat has high-current contacts then you don't need a relay, otherwise
it's worth putting one in.
David
i fully agree david, if i was doing it again i would include a relay for the sake of it, but i cant be bothered changing it!
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stephen_gusterson
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| posted on 9/6/04 at 10:00 AM |
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my fan runs all the time. It was too much hassle getting a stat into the cooling cct in such a way that i didnt think it would dump water at some
point in its life. also messed up my nice simple plumbing scheme.
Early fiestas in 950cc format had always on fans - you didnt get a stat and loom for it until you went to a 1.1L model. But then I had a new 1983
metro that didnt come with a passenger mirror and sun visor on the low models. The stupid things they used to do in early 80s cars to same money.
fiestas had plastic seats and floor coverings then.....
atb
steve
[Edited on 9/6/04 by stephen_gusterson]
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blueshift
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| posted on 9/6/04 at 03:04 PM |
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The engine should still get up to temperature thanks to the wax thermostat that shuts off water to the radiator when the engine is below running
temp.
running the fan all the time shouldn't cause problems apart from wasting a bit of power (hence petrol).
correct me if I'm wrong..
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stephen_gusterson
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| posted on 9/6/04 at 03:27 PM |
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Yep - otherwise I wouldnt have done it.
The fan draws about 10a at 12v, so thats less than 150w, or about 1/6 th horsepower..... I think I wont miss it!
atb
steve
quote:
Originally posted by blueshift
The engine should still get up to temperature thanks to the wax thermostat that shuts off water to the radiator when the engine is below running
temp.
running the fan all the time shouldn't cause problems apart from wasting a bit of power (hence petrol).
correct me if I'm wrong..
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