[DeTomaso] Single or Dual Pass Radiators?

[JJD1010 at aol.com]

Okay, so who makes a good single pass radiator that drops into our  cars?
 
Jeff
6559
 
 
 
 
-----Original Message-----
From: detomaso-bounces at realbig.com  [mailto:detomaso-bounces at realbig.com] On
Behalf Of B. Seib
Sent: Monday,  June 13, 2011 6:44 PM
To: DetomasoList; Ken Green
Subject: [DeTomaso]  Single or Dual Pass Radiators?

Ken
This has been discussed to death  several times before and agreement of all
parties was never achieved.
My  opinion based on an analysis of The views I trusted most was that a dual
pass  may have some small advantage in an idling/ traffic situation and the
single  pass was better at high speed/load/HP. If you believe the "more flow
is  better" theory, it's single pass. If you buy the theory that coolant
needs to  spend a long time in the rad to shed more heat, maybe dual or
triple pass is  for you.
Barry


Stewart Components and Evans Coolant are   "more flow is better"  advocates:

http://www.stewartcomponents.com/tech_tips/Tech_Tips_5.htm

http://www.stewartcomponents.com/tech_tips/Tech_Tips_3.htm

quoting  Stewart>>>>


Double pass radiators require 16x more  pressure to flow the same volume of
coolant through them, as compared to a  single pass radiator. Triple pass
radiators require 64x more pressure to  maintain the same volume. Automotive
water pumps are a centrifugal design,  not positive displacement, so with a
double pass radiator, the pressure is  doubled and flow is reduced by
approximately 33%. Modern radiator designs,  using wide/thin cross sections
tubes, seldom benefit from multiple pass  configurations. The decrease in
flow caused by multiple passes offsets any  benefits of a high-flow water
pump.


A common misconception is that  if coolant flows too quickly through the
system, that it will not have time  to cool properly. However the cooling
system is a closed loop, so if you are  keeping the coolant in the radiator
longer to allow it to cool, you are also  allowing it to stay in the engine
longer, which increases coolant  temperatures. Coolant in the engine will
actually boil away from critical  heat areas within the cooling system if 
not
forced through the cooling system  at a sufficiently high velocity. This
situation is a common cause of  so-called "hot spots", which can lead  to
failures.

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