Mailing List flyrotary@lancaironline.net Message #28583
From: Monty Roberts <montyr2157@alltel.net>
Subject: Heat exchangers
Date: Mon, 19 Dec 2005 12:40:13 -0600
To: <flyrotary@lancaironline.net>
Here is a picture of the Ford fitting attach area. Note the strap to hold the stack together. Also not the 1/8 thick plate that the fitting is attached to. Looks like this may have been a fix for a design problem with the other cores.
 
On a cautionary note, the pressures seen by an evap core are with a compressible gas in the system. All the pressure fluctuations would tend to be "soft". Oil is not compressible and any pressure fluctuations would be more like hammer blows. Definitely I would run an accumulator after the pump to damp the pressure fluctuations and use one of the cores with a more robust construction and the tension strap. If you insist on being adventurous.
 
As to the Mazda pump being somehow worse than normal.  A ford pump is a gerotor style just like a Mazda. The only difference is the pressures are much lower 60 psi or so vs. 100 for the Mazda.
 
I may run an accumulator with my Earls or Fluidyne just to be on the safe side. One big advantage of having the heat exchangers out of the engine compartment is if I do have a failure it poses little fire risk.
 
Monty
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