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Interesting about the galvanic action. I'm on my 3rd radiator in my 1993
Ford Escort. It has the rubber mounting pads top and bottom and rubber
hoses - but also has 2 metal tubes from automatic trans that connect to one
side of radiator with metal banjo fittings and copper washers - that's a
metalic connection to auto trans and thus to the engine. Maybe that is why
my the radiator leaks periodically.
If we use steel braided hoses between our A/C cores and 13B engine, that
will probably also provide an electrical connection. Maybe a "small" reason
for using rubber hoses covered by FireSleeve?
David
----- Original Message ----- From: "Bill Dube" <bdube@al.noaa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, April 20, 2004 3:17 PM
Subject: [FlyRotary] Tap water? (was: water coolant percentages)
At 08:23 AM 4/20/2004 -0400, you wrote:
Tommy/John,
<snip
>>> Galvanic action <<
The radiator is very often a different metal than the engine block
(or other major components wetted by the coolant.) Because of galvanic
action, it is very important that the radiator be electrically isolated from
the chassis. Otherwise, the two metals will form a battery and current will
flow, plating one component with metal from the other.
You will notice that the radiator in your car is mounted using
rubber grommets or plastic parts. It is electrically isolated from the
frame. Often, folks will discard the rubber grommets when they R&R the
radiator. This happens a lot in body shops. If you electrically connect the
radiator to the frame in your car, it will spring a leak in about a year.
It is wise to rubber mount the radiator in your airplane.
<snip>
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