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Old 01-10-2016, 08:35 PM   #393
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Makes sense or did I loose my mind ?
And NOW you question yourself?
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Old 01-10-2016, 11:19 PM   #394
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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..
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Old 01-11-2016, 05:32 AM   #395
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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.
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Old 01-11-2016, 05:50 AM   #396
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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 .....
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Old 01-11-2016, 05:58 AM   #397
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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
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Old 01-11-2016, 09:51 AM   #398
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A mind is a terrible thing...
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Old 01-11-2016, 12:00 PM   #399
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A mind is a terrible thing...
It would be if I hadn't lost mine 5 years ago!
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Old 01-11-2016, 02:43 PM   #400
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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?
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Old 01-11-2016, 03:05 PM   #401
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Did it say somewhere in your instructions that you can't electrically reverse the fan?

I don't think mine came with any such info and I know I've reversed the direction on other fans that I've purchased. A little googling indicated that some fans can be electrically reversed and others can't.

I'll have to see if the ones I put on the Argosy are reversible. I'll let you know...
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Old 01-11-2016, 04:39 PM   #402
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Did it say somewhere in your instructions that you can't electrically reverse the fan?

I don't think mine came with any such info and I know I've reversed the direction on other fans that I've purchased. A little googling indicated that some fans can be electrically reversed and others can't.

I'll have to see if the ones I put on the Argosy are reversible. I'll let you know...
Mine said they can be reversed by flipping the blades. Reversing the current doesn't do anything.
I just tried mine and they do turn freewheeling the same direction as when they are turned on.
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Old 01-11-2016, 05:54 PM   #403
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Mine said they can be reversed by flipping the blades. Reversing the current doesn't do anything.
I just tried mine and they do turn freewheeling the same direction as when they are turned on.
Peter, ignore the following if you know all this..

Fan blades (propellers) are usually shaped like small "wings".. When spun, they generate "lift" which translates to air movement. Wings (airfoils) are shaped to be most "efficient" when moved through the air in a specific direction called "relative airflow". Lift changes based upon wing shape, and maintaining laminar flow.... Now, if blade is symmetrical, it generates "lift" In either direction, forward or back.

Now the aeronautical engineers may argue this to death... But don't pick fly shy# out of pepper.....even a brick can fly.

I think You will be pleased with AC improvement and increase in radiator efficiency.

BTW, On one car I stuffed some AC tubing insulation between the condenser and radiator... Made a noticeable improvement ... By keeping the air contained and not leaking...So, pay attention to that relationship...

(Oh.. I suppose you are sure the radiator And condenser are "clear"...)
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Old 01-13-2016, 05:42 PM   #404
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Peter, are you looking for one of these?

Click image for larger version

Name:	86-345-transfer-switch.jpg
Views:	84
Size:	236.7 KB
ID:	255659
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Old 01-13-2016, 05:56 PM   #405
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Peter, are you looking for one of these?

Attachment 255659
That TODD transfer box is identical to the one I have. I ordered a Powermax 30 minutes ago.
Is that NOS? I prob can cancel my order if you want to sell me that one. It would make the wiring much easier, since i would not have to change anything
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Old 01-13-2016, 08:16 PM   #406
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Not NOS. It came from the 345.

If you want to cancel your order I can ship you this one.
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