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  #16 (permalink)  
Old 01-02-2014, 04:49 AM
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To me the downside is that it is a part that can fail and I know this cause it happened to me. A fan with no clutch attached can't.

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  #17 (permalink)  
Old 01-02-2014, 08:24 PM
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Quote:
Originally Posted by capeduece View Post
Do u gain any hp running electric fan versus a clutch ?

You will gain horsepower and mpg. About 4% more fuel economy. Someone said the MarkVIII fans move a ton of air, the older Taurus/Sable fans do too.
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Old 01-03-2014, 09:26 AM
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Quote:
Originally Posted by sunsetdart View Post
To me the downside is that it is a part that can fail and I know this cause it happened to me. A fan with no clutch attached can't.
I've had brake lines rupture, starters fail, and tires go flat, so by your logic, we should all go back to mechanical brakes, hand-crank starting, and solid rubber tires...

Maybe we should all just drive soap box derby cars.

OK, seriously, I agree with your premise to keep things simple, but there is a tradeoff. Yeah, I've had a fan clutch fail, but usually you can see the silicone fluid start to leak BEFORE it fails completely. Mechanical parts wear out and break. That is a fact of life. Yes, if you don't have a clutch, it won't fail, but running a clutch allows you to run a fan that pulls more air for cooling without paying the penalty in noise or lost HP. I trust electric fans a lot less than a fan clutch. In 40 years of driving vehicles with fan clutches, I've had exactly one failure on the road, and in that case it actually failed in the locked up position, so it still cooled, it just made a lot more noise.
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Old 01-03-2014, 12:07 PM
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Hayden - Fan Clutches and Fan Blades

Theres a good primer on Hayden clutches (both thermal and non) and the amount of pitch to the fan blades; from 1.5" to 2.5"+
Ive always preferred a good quality clutched fan. I had one fail along time ago on a truck (1974 C20 w. 350 v8) with 200k miles or more (farm truck). Went down to Napa and they had one on the shelf; standard rotation, thermal clutch, Heavy Duty and it was less than 30 bucks. If you have a street rodder electric fan and you burn it up in Sweaty Armpit, Oklahoma on a Saturday...what do you do? Even a non-thermal clutch for $20 will get you home, it'll just be loud and probably last 20,000mi as opposed to 50,000mi
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  #20 (permalink)  
Old 01-03-2014, 12:20 PM
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Quote:
Originally Posted by Ghetto Jet View Post
You will gain horsepower and mpg. About 4% more fuel economy. Someone said the MarkVIII fans move a ton of air, the older Taurus/Sable fans do too.
4%, ok.. sure.. you do know a mechanical clutch fan take zero hp until needed, most times in traffic.. not at cruising speeds..
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Old 01-03-2014, 12:23 PM
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I have nothing against clutch fans,
Ive had 1 failure and seen only a couple
worst one was on a 327, 57 chevy.
fan let go and chopped off trans cooler lines damaging the rad beyond repair (glad it did not go through the hood)
high/quick revving engines tend to toss the belt often,especially old style with alternator/generator on the left side
Ive seen quite a few fibergalss fans break after 1 or 2 years
belts get chopped by steel fan blades and seem to break fiberglass blades
heavier clutch fans seem to have more belts jump
I guess the shorter belt system and/or deeper pulleys have a use
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Old 03-19-2014, 09:29 PM
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Quote:
Originally Posted by gearheadslife View Post
4%, ok.. sure.. you do know a mechanical clutch fan take zero hp until needed, most times in traffic.. not at cruising speeds..
4% is a small amount. A clutch fan creates additional parasitic loss 100% of the time, not fully engaged does not mean 0 power is being wasted. Also, the engine will warm up faster with an electric fan vs a clutch fan, this saves additional fuel.

http://ecomodder.com/forum/showthrea...-fan-3365.html


1998 Mercury Mountaineer electric fan MPG increase. - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com

Is an Electric fan conversion worth it? My testing procedure - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
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  #23 (permalink)  
Old 03-19-2014, 10:18 PM
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do not forget that a non-clutch fan, just like an electric fan that is running.. will become an IMPEDIMENT to air flow...

if the air coming through the radiator is moving faster than the fan could move it by itself, the fan actually becomes an obstruction. that's why leaving electric fans hardwired on is a bad idea. This is also why we have clutch fans.. it allows the fan to over-run the engine speed..

my electric fans are set to come on @ 190F.. with a 160 t-stat, with the temp sensor in the radiator. so as long as I'm moving enough to keep the radiator doing it's job, my fans don't run. they only come on when I've been sitting still for a few minutes..
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  #24 (permalink)  
Old 03-20-2014, 05:19 PM
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Bottom line is, use whatever system that will cool the motor under ALL OPERATING CONDITIONS.
The only electric fan system I personally would consider is the Mark VIII system.
https://www.google.com/#q=Mark+VIII+fan+install
All the aftermarket electric fan system manufacturers lie through their teeth about their system's capabilities in my opinion.
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