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Registered:
May 2002
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Electric Fan or Engine drive fan ??
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Fri, 12 July 2002 14:18
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I'm putting an 100KW 4age into AE86 sprinter...I would like to know whether it's better to run electric radiator fan than engine driven radiator fan.. I've heard that with electric fan the engine revs bit better and gives about extra 5hp than engine driven fan...what are your guys opinion ???
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I supported Toymods
Location:
Adelaide
Registered:
May 2002
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Electric Fan or Engine drive fan ??
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Fri, 12 July 2002 22:39
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| jazae86 wrote on Sat, 13 July 2002 12:39 AM |
The power gain you pick up you loose in driving the alternator.
Jaz
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Uhmmm maybe you should rethink this a bit..........how often do you think the thermo fan will switch on and when is it likely to do so?
I suggest that if youre cooling system is running properly then the only time you would need your thermo is when the car is standing still in traffic. And i dont think thats going to affect your performance too much seeing as you will be pretty close to travelling at 0kms  . the only other time is if you were really giving the engine a long consistenet thrashing under extreme load, i.e at a track where it is likely you will be moving fast enough for the engine to cool with airflow anyway, I doubt you would be able to give it the same punnishment for long enough to switch the fan on while driving on public road, more likely is you give it some and come close to standstill and the fan will switch on then.
by using the thermo fan you reduce a large amount of uneccesary parasitic drag and can in fact get about 2-4Hp increases. the thermofan alos weighs less so you also reduce your overall weight. If youre that worried about power loss then just use the 100Kw alternator which is a bit stornger.
In my experience a thermo fan is the better option but each to thier own I guess
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Location:
sydney
Registered:
May 2002
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Re: Electric Fan or Engine drive fan ??
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Sat, 13 July 2002 05:53
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my thremo fan is wired up to a proper switch and is set up to work only when needed.Lately it has hardly had to come on as the days have been cold enough for it not to reach to temp that the switch is set at.Thremos are the way to go but wire them up properly and you will have no probs
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: Electric Fan or Engine drive fan ??
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Sat, 13 July 2002 06:24
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There's only one choice - Electric fan.
You can run an engine driven fan, but what you have to do is use a RWD water pump, as they have a longer shaft sticking out the front, and that locates in the back of the viscous fan hub. The FWD water pump doesn't have that, so at 5400rpm the fan assembly will develop really nasty harmonic imbalance that will literally rip the front of the water pump clean off.
You'd also need a RWD offset pulley.
How do I know this?
Because I have done it - twice! I thought I'd stuffed up fitting the fan the first time, so I did it very carefully the second time but at exactly the same rpm the whole fan and front half of the water pump broke right off. The radiator had a large gouge ripped in it, and the water pump backing plate thing was also broken in half.
So since you already have a FWD type water it's probably a better idea to get an electric fan anyway. 
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I supported Toymods
Location:
Adelaide
Registered:
May 2002
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Re: Electric Fan or Engine drive fan ??
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Sat, 13 July 2002 06:34
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I stand corrected.
I was thinking more along the lines of constantly on elec fan.
In any case, I agree. I would put an elec fan on to replace a belt driven fan due to ease of use and the fact that, as you suggested michael, you only need to operate them at certain times, thus being more beneficial.
Jaz
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Location:
Sydney- Sutho Shire &...
Registered:
June 2002
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Re: Electric Fan or Engine drive fan ??
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Sat, 13 July 2002 10:04
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I fitted a davies craig fan to my other (non toyota  ). If any car needs all the hp it can get, this is it!
I also fitted a potentiometer so I can adjust the cut in temp.
For serious cooling effect, have a look at a late model Falcon. They have a twin set up that isn't too deep. I saw one today but didn't measure it up 
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Registered:
May 2002
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Re: Electric Fan or Engine drive fan ??
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Sat, 13 July 2002 23:44
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Thanks for all your guys information..
I guess I'll go for thermo fan . 
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