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Greg Roberts' (forum name Eagle 20) 1989 Model 20

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Greg,

I don't want to be critical of what you have done, it looks like a quality job, but I would be concerned about your air scoop on the radiator. You have reduced the surface space that the fan pulls from significantly, therefore reducing your airflow through the radiator. Pulling mountains may not produce enough road speed to force air through your scoop. Just my opinion.

Also, you may have exceeded the legal limit on the width of the bus.

Have you driven the bus with the new scoop on? If so, what difference, if any, have you noticed in the engine temperature?
Daniel Lenz
Brownsville, Texas


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Dan, I did consider the air reduction in the design and made the inlet of the scoop as big as possible to still stay under the 102" width limit. My plan is to test the unit on a hot day at my nearby pass and see how it does. I may need to add a little more surface opening by way of slats for the really low speeds but I seldom get below 45-50 on the hard climbs. The proof will be in the test though so I will learn if this gives me the additional cooling that I am hoping to get.

From my research the 102" is supposed to be the legal limit. Can you confirm that this is so as well?
Greg Roberts
New Mexico
1989 Eagle Model 20
6V92 DDEC II, Allison ATEC HTB 748
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Greg,

The legal width is 102", however, I am not sure whether or not you could run into problems having that one addition of a scoop onto your bus, when the rest of the bus is 96". I don't think it should be a big problem unless you run into one of those difficult officers of the law. :shock: :? 8-)
Daniel Lenz
Brownsville, Texas


The work of an unknown good man is like a vein of water flowing hidden underground, secretly making the ground greener.
SmoothJazz
 
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Location: Brownsville, Texas




Greg,
I'm hoping that it is a good application for you. I, like Dan thought of the possibles that would affect it's performance. When you reduce the area for air intake you possibly could create a situation where air pressure differential inside & outside the scoop will cause a turbulence at air scoop entry that swirls the air not allowing it to get in. Another possibility is the fan sort of cavitates because it is starving for air. It is turning but not moving enough air. All this I'm spelling out in very basic laymans terms for lack of knowledge. If your temp goes up too much another possibility would be to cut slots in your scoop & bend them out to allow more air entry points along the length. Bus is looking great. :P :P
John & Tara Mellis
Bowman, SC
1982 Eagle Model 10 DD 6V92 Allison Auto
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