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From: "Russell Duffy" <13brv3@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Oil Cooling/Pumping
Date: Wed, 15 Dec 2004 12:20:41 -0600
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In-Reply-To: <list-568213@logan.com>

Here's something else to consider.  I just learned an interesting fact =
about
the 912.  It has a dry sump system, and it's oil cooler is on the =
"suction"
side of the oil pump.  It wouldn't be impossible to set up a 13B this =
way,
which is something else to consider, but then you'd have to worry about
sucking the cooler flat, rather than over pressurizing it.  Might be =
safer
to suck air, than spew oil though. =20

Bottom line is that I'm hoping we can agree that oil coolers need =
special
consideration when it comes to durability.  The evap core seems to be OK =
for
water, though I'd like to stop using them for that as well.  I suspect =
there
are strong pressure pulses from the oil pump that are fatiguing the =
cores.
For the record, this isn't just a problem with the evap cores, because =
we've
had a Setrab fail, as well as whatever was being used in the Velocity
(twice).  Installation is important, but it's also hard to deny that =
Mazda
built their coolers extra tough for a reason.=20

Rusty (trying to catch up)