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Regular
Location: Clovis, Ca | Everyone has always told me that the back of the coach is a negative pressure area. Conceptually, I understand that.
The coach is basically a huge block moving through air, meaning there is a high pressure pushing on the coach in the front (and slightly on the sides and roof), and a low pressure area "sucking" the coach back in the rear.
BUT HOW MUCH???
If ambient is 14.7 PSI, is the low pressure area in the rear of the coach a couple of PSI less? Five PSI less? What is realistic in this?
I am asking because we are once again looking at the cooling question with fresh eyes. What is realistic? |
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Veteran
Location: Kingsley Michigan | Jerry---
You are asking a question that can only be answered with scientific test results--as I too have wondered amny a day and night about why this coach is so hard to cool while a greyhound whizzes by with a bigger front end and load but with no cooling problems--sooo
I am building a Manometer with a sensative scale to test the actual and try to find the problem areas---
Over the years --I found that the biggest problem was old technology---and an enormous and inefficient brass radiator--which can easily be replaced with an inexpensive single or 2 core aluminum one with fantastic results---almost like a real car or bus---
But you are on the right track and I will be trying to help you find some of the answers to a better airflow--and maybe eliminate the botched waterpump/fan issues in the back as well--
Barn |
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Regular
Location: Clovis, Ca | I think the bigger buses direct the side air to the rear facing radiators. In other words, they are drawing ambient air to the radiator, not engine bay, preheated air.
I am VERY curious to the results you come up with on your manometer test. Please do post! |
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Contributor
| My original "pusher passion" was the flxible clipper w/skyhook!! Roof radiator ram...
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Regular
Location: Clovis, Ca | They really had a good idea with the clipper. No cooling issues there!
 (Flxible Clipper cooling diagram.jpg)
Attachments
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 Flxible Clipper cooling diagram.jpg (34KB - 30 downloads)
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Regular
Location: Clovis, Ca | We are now leaning toward mounting a conventional aluminum radiator flat against the rear of the coach. We are thinking about pulling ambient air in just ahead of that (on the side) with a large electric fan.
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Negative pressure in the back? How much?
