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bkahler · 12-27-2015, 06:36 PM

I did a quick check of the dash top overhang and its about 3/4" however the dash face has a slight angle maybe 3 to 4 degrees which will also help. So hopefully the tilt adjustment will be a last resort!

tevake · 12-27-2015, 08:56 PM

Here is a look at my fan arraignment Peter. Taken just before mounting the new airdam. I'm not at the coach , so can't look for numbers.

Hope this adds helps in your considerations.

Cheers Richard

PeterH-350LE · 12-28-2015, 04:50 AM

Quote:

Originally Posted by tevake

Here is a look at my fan arraignment Peter. Taken just before mounting the new airdam. I'm not at the coach , so can't look for numbers.

Hope this adds helps in your considerations.

Cheers Richard

Thanks Richard, both a trans and Oil cooler, nice. Is that an aluminum radiator? I know I need to separate mine sooner or later, just dont have much motivation, since I am running a nice 190 degrees without the fan clutch and aux fans.
Here is a suggestion for you and everyone for those early evening, long distance travels. This is such a cheap and easy preventive measure and keeps you from using potentially damaging high pressure to get all the bugs out. I use tie wraps to quickly fasten the mesh to the front of the radiator. No airflow problems.

bkahler · 12-28-2015, 06:02 AM

Bugs? You have bugs in Texas?!

I thought they were small airplanes...

cwf · 12-29-2015, 07:40 PM

Quote:

Originally Posted by bkahler

Bugs? You have bugs in Texas?!

I thought they were small airplanes...

Yup and June Bugs are B-17's!

PeterH-350LE · 01-10-2016, 03:49 PM

Installed 2 10" fans in front of the radiator. Easy does it, right?
Well, when I switched them on (controlled by a switch on the dash), it was blowing towards the front. Great for auxiliary braking...

So I checked if the wires are reversible, nope. Finally figures out that the fan blades can be reversed for pushing or pulling air. Confirmed it with the manufacturer, took it all apart and reversed fan blades.
Now its not pushing the air towards the front anymore, but it does not really push it towards the rear.

So, I suppose that pulling Air through a fan like that does not equal pushing. Can anyone confirm that?
I am not sure if I am clear, after reversing the blades it quit blowing to the front, but it does not really blow towards the back
There is no way these fans could be mounted the other way, since that would expose the rotating blades.

cwf · 01-10-2016, 04:56 PM

Peter, what fans did you install, model plz

PeterH-350LE · 01-10-2016, 05:51 PM

Quote:

Originally Posted by cwf

Peter, what fans did you install, model plz

Channing,
here is the link, no manuf. name, but it does say push/pull
10"in Black Slim Radiator Fan Push Pull Cooling Electric 12V VIP BMW E36 M3 E46 | eBay

bkahler · 01-10-2016, 06:31 PM

Peter, these rigs need all the braking help they can get!!

The issue with the fans sure doesn't sound right. I used a pair of these S-blade cooling fans as pusher fans and there is definite air movement through the radiator when they are running.

I've used the straight blade fans before and have not been as impressed with them as with the S blade style. I'll have to check but I thought the ones I bought were reversible. I'll check this week to see if that's the case.

PeterH-350LE · 01-10-2016, 06:53 PM

Quote:

Originally Posted by bkahler

Peter, these rigs need all the braking help they can get!!

The issue with the fans sure doesn't sound right. I used a pair of these S-blade cooling fans as pusher fans and there is definite air movement through the radiator when they are running.

I've used the straight blade fans before and have not been as impressed with them as with the S blade style. I'll have to check but I thought the ones I bought were reversible. I'll check this week to see if that's the case.

Everything except the shape of the blades is identical to mine, even the 12V 80W label. Reversibility has to take into account that the moving vehicle will turn the blades only one way. The rotation of the fan has to match that.

bkahler · 01-10-2016, 07:23 PM

Quote:

Originally Posted by PeterH-Airstreamer

Reversibility has to take into account that the moving vehicle will turn the blades only one way. The rotation of the fan has to match that.

I'm not sure I follow this. When a fan is powered it's going to turn the direction it's designed to turn.

It's late and I'm tired, am I missing something obvious?

PeterH-350LE · 01-10-2016, 07:36 PM

Quote:

Originally Posted by bkahler

I'm not sure I follow this. When a fan is powered it's going to turn the direction it's designed to turn.

It's late and I'm tired, am I missing something obvious?

Let me try to explain in a different way.
With the fan turned off, the blades will rotate while you drive.
With the Fan turned on, the blades have to rotate in that very same direction AND pull the air through to increase the Air flow
If that is not the case, you would have a very hard working and non efficient fan while in motion.
Makes sense or did I loose my mind ?

Keyair · 01-10-2016, 08:35 PM

Quote:

Originally Posted by PeterH-Airstreamer

Makes sense or did I loose my mind ?

And NOW you question yourself?

cwf · 01-10-2016, 11:19 PM

Peter,
Here is a pretty good explanation of the thermal dynamics, directly and specifically with auto's..
http://inpressco.com/wp-content/uplo.../Paper11-8.pdf

What I get from that.. is first, a bunch of really smart folks contributed to a relatively easy read... even with my handicap...

Your fans, per the published stats, each force about 1700-1750 CFM.. and CFM.. and SPEED are crucial to provide proper/effective 'cooling'.

I have personally seen TOO high of a 'coolant flow' in high output engines.. where the turbulence in the water jacket and lack of 'contact time' actually diminished the cooling capability of the system. This does not appear to have been the issue with your 'parade' test.

Since you left your 'engine' fan in place, there should always be 'draw' across the radiator and condenser. To increase efficiency of the engine fan.. replacing with a better/more efficient one should certainly help.

If you are sure the 'fan clutch' is fully engaging, then these fans will certainly assist the low speed/idle problem you encountered... having them installed as you did, should help 'increase' the pressure in front of the engine fan and increase it's efficiency..

Were I you, I would consider a test... when it 'warms up' here in Texas... drive your beautiful motor home around till 'warmed' up to operating temp with the fans "off".. they should have little impact on the airflow when you are moving.

Then drive home. Have the AC blowing at full capacity.. with windows /hatches all open...watch and note the temp... then, drive around your neighborhood, simulating the 'parade' pace. You should see temps 'rise' a bit... note the temp of air coming out of the vents... use a temp gauge...

Now, switch on the 'fans'... and note the improvement/worsening of the temp concern..

Having a 'full heat load' on the system is the only way to know you have helped your cooling issue... but, from personal experience, I think you will be quite pleased with the effort..

PeterH-350LE · 01-11-2016, 05:32 AM

Wow, Channing, and i thought all you have to do is flip a switch.

My "Parade" walking speed temperature issue was a one time affair, the reason I installed the fans is for the AC condenser.
This engine runs at a beautiful 190 degrees and I do not want the fans to engage at xxx degrees via a thermal switch or the ECU. They draw just to many amps to run them continously. I could of course set the engage temp at ~210, but that may not help the AC at all times.
Your test procedure makes sense and i will try it sooner or later.

PeterH-350LE · 01-11-2016, 05:50 AM

Quote:

Originally Posted by Keyair

And NOW you question yourself?

Well, I started to question myself, after I followed YOUR suggestion and used the fan as an Air brake and failed .....

bkahler · 01-11-2016, 05:58 AM

Quote:

Originally Posted by PeterH-Airstreamer

Let me try to explain in a different way.
With the fan turned off, the blades will rotate while you drive.
With the Fan turned on, the blades have to rotate in that very same direction AND pull the air through to increase the Air flow
If that is not the case, you would have a very hard working and non efficient fan while in motion.
Makes sense or did I loose my mind ?

My thinking is when the fan is not running and you're moving forward the fan is going to free wheel whichever way the air flow forces it to turn which should be air flow towards the radiator. When it is energized it will turn the way it wants to.

As for losing your mind, I think we're both in a race to see who gets there first

cwf · 01-11-2016, 09:51 AM

A mind is a terrible thing...

Keyair · 01-11-2016, 12:00 PM

Quote:

Originally Posted by cwf

A mind is a terrible thing...

It would be if I hadn't lost mine 5 years ago!

PeterH-350LE · 01-11-2016, 02:43 PM

Quote:

Originally Posted by bkahler

My thinking is when the fan is not running and you're moving forward the fan is going to free wheel whichever way the air flow forces it to turn which should be air flow towards the radiator. When it is energized it will turn the way it wants to.

As for losing your mind, I think we're both in a race to see who gets there first

I will test that "theory" this evening. Well, at least i can test it on my fans.
I will take it even 1 step further into insanity:
Since the blades are reversible on my fans, I think they still will turn only 1 way when freewheeling.....which is the same way it rotates when energized. Crazy huh?