Mailing List flyrotary@lancaironline.net Message #2788
From: Russell Duffy <13brv3@bellsouth.net>
Subject: radiator and oil heat exchanger specs
Date: Wed, 3 Sep 2003 16:30:56 -0500
To: Flyrotary List <flyrotary@lancaironline.net>
Message
Greetings,
 
Attached are a couple postage stamp size pics of the Howe radiator in my RV-3.  Pic 1 shows the top side of the radiator, with the forward end on the left of the photo.  Pic 2 shows how it's mounted, and part of the reason for the BUC (big ugly cowl).  When I first mounted it, I wanted to leave space between the oil pan and radiator for some airflow, and also to be able to install a fan if needed.  When it gets repackaged later, I'll likely raise it up a couple inches. 
 
On the left of photo 1, from top to bottom, we have:
 
-water from the engine (AN-16)
-oil from the engine (AN-12)
-oil out to 2nd heat exchanger (AN-12)
-spare port for air bleed, temp sensor, etc (1/2" NPT female)
 
On the right side from top to bottom:
 
-oil out to filter, then engine (AN-12)
-water return port (AST return, 1/2" NPT female)
-water return port (turbo return, 1/2" NPT female)
-oil in from 1st heat exchanger (AN-12)
-water out to engine (AN-16)
-In the middle of the tank, barely visible on the right, there's another spare port for drain, temp sensor, etc (1/2" NPT Female)
 
As I mentioned before, there's no real data on the actual oil heat exchangers, but I'm also attaching a scan from the Howe catalog.   My radiator has one of each size, since I couldn't fit two of the largest size. 
 
Study this, because there will be a quiz in the next email :-)
 
Rusty
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