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Old 08-29-2013, 04:26 PM   #15
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Originally Posted by Skip426 View Post
When traveling with the cruise on , I have to depend on hearing the rad fan cycle , to know it's working. When I have my foot on the throttle , I can feel the fan cycle to high. Yep it's a drag on the system, and only two speeds on my old rig.
On my rig I can't hear the fan at all, nor can I readily "feel" it. BUT I am almost always running dash AC on high and NOT running the coach AC because running the GEN uses too much fuel. Perhaps I am wrong.

Anyone have any empirical data to show the difference between dash air only and no dash air but gen set running coach AC?

Chris.
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Old 08-29-2013, 05:35 PM   #16
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Originally Posted by akeyzoo View Post
On my rig I can't hear the fan at all, nor can I readily "feel" it. BUT I am almost always running dash AC on high and NOT running the coach AC because running the GEN uses too much fuel. Perhaps I am wrong.

Anyone have any empirical data to show the difference between dash air only and no dash air but gen set running coach AC?

Chris.
That has been discussed a few times. I think it depends on a few factors...

1. My 7.5kw Onan is suppose to burn .8 gph at full power. Use of my coach AC is about 32 amps so say that is 60% power which means I am burning about .48 gph if both AC units are running continuously.

2. I've also heard similar numbers as earlier said that the radiator fan running at full speed can use as much 70 HP which is a large % of a 400 HP engine. Hence, if running the dash AC locks the fan up to run at full speed then it would seem there is a lot of HP being used and thus fuel.

My working theory is that the generator burn is less than the extra fuel to needed to feed the engine when running the dash AC. At worst, it is a wash.

That being said, I don't normally run both and prefer to run the coach AC. However, as I was running into, when it sun is pouring on us I needed to fun the dash AC for the direct cooling the faster, directed fans could provide.

Like I said...it is a working theory.
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Old 08-29-2013, 07:51 PM   #17
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That has been discussed a few times.
Like my post to the last discussion on the cost of the use of the gen set and roof , A/C units . If your not comfortable because it's too hot to drive in your coach ; what are the alternatives ? Stop short of your destination and spend the night $$ waiting for a cooler day $$, or flip the switches and keep going. Your spending money , anyway , do what you want.
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Old 08-29-2013, 08:15 PM   #18
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If you run your gen for "whole house" cooling while traveling it's difficult to cool the drivers area. We bought a small squirrel cage fan (Lowe's has them) that is 110VAC and aim it at the drivers area. It helps alot without having to run the dash A/C too.
Can you explain where you mounted the fan and maybe even post a picture? Thanks.
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Old 08-29-2013, 08:22 PM   #19
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Like my post to the last discussion on the cost of the use of the gen set and roof , A/C units . If your not comfortable because it's too hot to drive in your coach ; what are the alternatives ? Stop short of your destination and spend the night $$ waiting for a cooler day $$, or flip the switches and keep going. Your spending money , anyway , do what you want.
The point of my original post was not to worry over the cost of running the dash AC and house AC, it was to understand what was happening with my water/tranny temps.

Now...it is natural for some topic drift to occur but that doesn't change my original question on what is happening. I have sent an Email to "Big Mike" at Spartan so see if he can provide some technical aspects of this discussion. Perhaps he can shed some additional light on this after he gets back form the long weekend.
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Old 08-31-2013, 10:02 AM   #20
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Sky Boss, my coach temps drop as did yours. You will also find that the same drops in temperatur occurs with the heater turned on. I have always assumed that the flow of fluids thru the hoses reduced the temperature. As far as fuel consumption as long as I'm comfortable the usage is just right.
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