DeTomaso Mailing List: July 99, Message #349

Forest,

I agree with you that your horizontally split radiator would work (tansfer 
heat) equally well plumbed either way.  The tendancy to trap air would be a 
little less if fed through bottom tube, but not by much (the height of the 
top of the top tube vs. the height of the bottom of the bottom tube).

If you split the radiator vertically and flow front to back, the tendancy to 
trap air is the same as above.  However there is an advantage to feeding the 
"hot" water from the block to the BACK of the radiator for lower flow rates 
where there is a significant temperature drop in the water.  These 
advantages are in the 8% range for a 20 degree water temperature drop and 
are close to zero for a 5 degree water temperature drop (it helps more at 
idle).

FWIW
Brent
4130


>From: "Forest Majors" <forest.majors@snet.net>
>Reply-To: "Forest Majors" <forest.majors@snet.net>
>To: Multiple recipients of list <detomaso@realbig.com>
>Subject: Radiator Hose Routing
>Date: Fri, 9 Jul 1999 10:30:22 -0400
>
>When I recently posed the collapsing hose riddle for the group several
>individuals suggested that the hoses may have been connected backwards. 
>When
>I checked the routing of the hoses the top connector on the radiator was
>connected to the pump inlet and the bottom connector was connected to the
>return pipe from the pressure tank.
>
>I understand the rationale of having the return water flow from the engine
>going to the top of a radiator and the cooler water being drawn from the
>bottom of the radiator to the pump. Obviously air would tend to raise to 
>the
>top of the radiator and gravity would assist the flow of the water towards
>the pump sans air. In a conventional car with a front engine and tall
>radiator the conventional routing of the hoses would also shorten the
>distance between the pump and the engine.
>
>However, the interesting aspect of all this is that the stock Pantera water
>pipes are physically designed to connect the pump to the top connector on
>the radiator and the return to the bottom connector. And both the Technical
>Information manual and the subsequent TSB show the water being routed in
>this manner. The question is: Would the vertical baffle used in the 
>original
>radiator dictate this routing?
>
>The radiator that I am using is a Hall replacement. I assume that it has a
>horizontal baffle but you can not tell from the outside of the tank. The 
>two
>connectors are only inches apart in the middle of the radiator so I would
>suspect that the top connector is just above the bottom of the baffle for
>the top section. The bottom connector is just under the baffle so it would
>be at the top of the bottom section of the radiator. Therefore, I am not
>sure that reversing the routing would have a significant impact, all other
>things being equal. And the hoses align up now!
>
>Forest - Still pondering where to stick his hose.
>
>
>


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