E-fan

[cgalpha08]

So im looking at getting an e-fan setup for the 3 and i have a couple questions.

1. Does it really cool better than the oem fan?

2. How hard of an install is it, meaning how much modification is necessary to install it?

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[6pack]

This is something that is on my list but I haven't got to it yet, so I'm not sure what is available out there. How hard it is to install will depend on if someone makes a kit for us or if you have to piece together one. My guess is for someone with moderate mechanical ability it won't be that hard. You're just removing the stock clutch fan and wiring in the e-fan.

The e-fan probably won't really cool better than the stock fan. If you end up with a fan that pulls more air than the stock one, you might see a difference, but from the ones I've done in the past, I generally ended up with one that had the same flow as the stock clutch fan. The main benefit is you are removing the clutch fan, which is a drag on the engine. This frees up some horsepower.

Keep us updated as to what you do. And post pics!

[cgalpha08]

PCMforless has a kit for the H3's. My main concern is for cooling and it its not better than oem than i wont bother. I am not in need of the additional hp or mpg just the cooling. My other interest is in a tranny cooler

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[6pack]

If cooling is the goal, then you should verify what the stock cfm is and what the kit from pcmforless has.

[HummBebe]

I asked Bill at Ron Davis this very question when they were developing the H3 Radiator.

He stated that the e-fans are about half of the CFM's of a mechanical fan. They are not necessarily for daily drivers either. Clutch fans like we already have are by far the best. He said ours (GM Clutch Fans) run 10-14Kcfm's. Not many e-fans can duplicate that.

Here is an FAQ I found on Flexalites site, that give a basic rundown of the facts.

Flex-a-lite's Frequently Asked Questions:

What's does C.F.M. stand for ?
C.F.M. is an acronym for Cubic Feet Per Minute. This is the automotive industries standard for measuring air flow.

Why isn't there a C.F.M rating on your flex and clutch fans ?
C.F.M. ratings are based on constant variables, such as r.p.m and blade pitch angle. With direct drive fans neither of these variables are constant so a general C.F.M. rating is not assigned.

How much clearance do I need between my flex fan and radiator ?
At very least 1" from the closest part of the fan to the radiator. This inch allows for movement in your motor mounts, chassis flex, and of course flex in the fan.

What's the best type of fan to have on a vehicle that frequently tows ?
A good heavy duty clutch and clutch fan. This combination allows for the best air flow to fuel economy ratio.

Are component parts available for your electric fans ?
Yes, your point of purchase can order any replacement part you may need, i.e. fan blades and motors etc. You may also order components directly from Flex-a-lite with a VISA or MC.

When installing an electric fan how much of the radiator needs to be covered ?
We recommend 70% of the radiator core be covered.

How important is it to have a shroud around my fan ?
Very, one of the properties of air is that it likes to follow the path of least resistance. With a shroud you force the air to be drawn through the radiator instead of around it.

How far should I put my fan into the shroud opening ?
As close to half in and half out as possible.

Which type of electric fan is better, a pusher or puller ?
For primary use a puller. For auxiliary use a pusher.

Is there anything I can do to make my model # 150 a pusher ?
Yes, turn the blade over and reverse the polarity of the MOTOR WIRES. Note: the fan does not run as efficiently in a pusher mode.

Do you have any electric fans you recommend for my motor home ?
We recommend that you keep a mechanical fan for your primary cooling needs. For additional cooling we offer several auxiliary fans listed in our catalog.

When I drive down the road at 55 mph my car over heats, is this a fan problem ?
In most cases no, at 55 mph ram air cools the radiator. Check for obstructions blocking air flow through your grill and radiator.

How do I know if I have a standard rotating fan or a counter clockwise rotating fan ?
As a general rule 'V' belt vehicles are standard rotation and serpentine belt vehicles are counter clockwise rotating.

When are transmission coolers recommended ?

Mainly on automatic transmission vehicles that tow on a regular basis.

[cgalpha08]

Thanks bebe!!! That pretty much settles it for me!!

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[6pack]

10-14k cfm is pretty huge. But if it saves me a few horsepower...