SNAIL

Harley · Posted: Tue Apr 22, 2008 1:38 pm Post subject: Electric Thermo Fan

I have been experimenting with an Electric Fan but have not found an aftermarket 10inch fan which is efficient enough.

I have installed a VDO CHT gauge and a simple switch to run the fan.
At WOT on the highway temp sits around 350°F or 310°F when cruising with the original fan. With the aftermarket fan it will easily overheat at WOT and sit at 400°F slow cruise running constantly.
In city driving original fan holds between 250°F and 300°F, aftermarket 300°F to 350°F.

Fans i have tried, a good one, MODEL DCSL10: http://www.daviescraig.com.au/main/fans.asp?action=model

And a cheap Ebay one:http://cgi.ebay.com.au/10-INCH-LOW-PROFILE-HIGH-PERFORMANCE-THERMO-FAN_W0QQitemZ120247488218QQihZ002QQcategoryZ33599QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I know the original fan is efficient but i thought you could benefit from a electric thermo fan, especially as i have plans for injection, turbo, etc.

for installation i machined down an old fan pulley to it's minimum and mounted the fan on the front of the cowling...

Maybe i just need a bigger fan Confused

Has anyone else tried this and had any luck, Lars?

Harley
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Bart · Posted: Tue Apr 22, 2008 3:00 pm Post subject:

Hi Harley,
Some friend of mine have tried electical fans of Xantias/C15s or XMs on their 2cv4x4s. But they all found that an electrical fan just doesn't generate enough airflow to cool the engine at higher loads or WOT...
It was only advantages for offroading through the water, because with the fan switched off you don't get a lot of mist in the car and moreover you keep engine power, because the original fixed fan workes as a pump in the water so it takes a lot of power or even stops the engine.

I'd just stick to an original fan for a road car , probably with less blades. I have 3 blades less on my car, but can't really advice cause I only have few experiance with it.

Cheers, Bart

p.s. The temperature you mention don't say anything to me... we do Celcius you know. A conversion would be nice.

Jasu · Dropped Joined: 30 Sep 2007 Posts: 211 Location: Finland

I had electric fan, from peugeot 305 with shortened blades. It was good in winters, but not in summers, in Finland...

Take temperature switch for Bx, it is 2-phase switch, then You can make 2-speed blowing...

What injection You are thinking? In Megasquirt there is controlling for fan, where You can adjust temperature when fan starts and stops blowing, and of course there can put blowing with full throttle and so on...
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Olli · Posted: Tue Apr 22, 2008 5:07 pm Post subject:

I think most broblems whit electric fan are because new fan is located outside
of fan cover (in most cases). Original fan is designed not so much suck air in
(air comes there anyways) but blow air sideways on cylinders. I think best
solution would be to use plastic part from original fan and keep it in same
position that its originally, just make new bottom part and put electric engine
inside of it (inline order: car engine- fan- electric engine).

complicated try to tell it whit my english, but hope you get what I try to say Very Happy

-Olli
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Harley · Posted: Fri Apr 25, 2008 4:48 pm Post subject:

backfire · Posted: Fri Apr 25, 2008 5:27 pm Post subject:

About the fan, appearantly a vecta 1.6 electric fan fits perfectly under the engine, take away the engine cover from below. Someone with a Patron had a problem when waiting for traffic light or in traffic jam that his engine would heat up, after he installed this fan the problem was solved. Only thing is that you have to be careful with sleeping policemen (speedpumbs). Costprice 30 euro.
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champy2k · Dropped Joined: 02 Jul 2007 Posts: 116 Location: uk

most of my engines run at about 400f on duel cht gauges,
as long as both needles level is the thing
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ami8i · Posted: Tue May 06, 2008 11:40 am Post subject:

Hello harley,
intersting topic. :) I have collected various fans for years.
Frank (Germany) told me his test results: Electric fans are too weak to dissipate the heat. I has been rather dissapointed but some Streetdyno runs showed me that the OEM fan costs about 1kW. http://megasquirt-de.serviceline.ch/success/user0001/pics0001/Graph-out-Vergaser-mit-und-ohne-Luefter.gif
If you'd feed a huge electric fan at WOT with 1kW you'd alo buy a rather strong (=big & heavy) alternator!!

BUT I wonder that the Spa racers are able to cool down with really large oil coolers only.

My current idea is to make the fan blades more narrow and adding an switchable electric fan in front of the mechanical fan.
It's very important that the gap between tube/case/box and fan is very narrow. Tuned A/C Porsches/Beetles require less than 1mm.

Most elegant solution would be a 'visco fan' which was used at some bigger 80ties Opels (GM) and maybe other models. When the engine is hot the Silicone get's 'stiff' and the fan is turned on. I haven't studied the fan but I'm afraid it's heavy and difficult to avoid bad vibrations - especially at high revs.

@Turbo:
Frank told me that he's temeprature problems when he consumes turbo power. He isn't able to get rid off the huge amount of heat (~25hp!)of an ~70hp Visa engine in a street 2CV.

@MS:
Check some pics of my MS docs, sorry German only.

@all:
Which temperature are you discussing? Oil in sump, oil in cylinder head cap, cylinder head temperature at exhaust manifold/exhaust valve..., air temperature in heater bulbs....?

»Horst

PS+OT:
Haven't seen many French who apologize their English. Be glad to get any answer. Wink

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Lionel · Posted: Tue May 06, 2008 2:27 pm Post subject:

Harley · Posted: Tue May 06, 2008 4:01 pm Post subject:

Hi Horst,

Nice reply:)