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Message-ID: <20060615205838.9955.qmail@web30102.mail.mud.yahoo.com>
Date: Thu, 15 Jun 2006 13:58:38 -0700 (PDT)
From: Steve Brooks <prvt_pilot@yahoo.com>
Subject: Re: [FlyRotary] Oil Cooling Issues
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-1155926@logan.com>
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Joe,
I don't think that you can just remove the thermostat
from the oil cooler.  I think that it opens to close
off the bypass port and opens the path through the oil
cooler, or something like that.  

If you fly it with the thermostat in, is the oil
cooler then hot, or is it still cold ?  If it is cold,
but your oil is too hot, then maybe the thermostat is
bad.
Not sure how high your oil temps are, but I think that
the thermostat is suppose to open at 190 F.

I have about 25 sq in  of scoop on mine to get it to
cool properly, but I'm generating more HP with the
turbo.  I'd think that 20 sq in would be sufficient.

Steve Brooks


--- joeh@pilgrimtech.com wrote:

> I've been trying to solve an oil cooling issue for
> the last 2 weeks.
> Everything I do seems to make it worse:
> 1. I built a flow guide on the prop side of cowling
> (pusher) to prevent
> back-flow into cowl. Temperatures worse - removed.
> 2. I cut a new hole and fabricated a new exit scoop
> on the bottom of the
> cowl to add 20" of exit area- Temperatures the same
> to maybe even worse.
> 3. I created a new oil cooling intake scoop that is
> 3 times as large as the
> original bring the total oil intake area to about
> 20sq in. - no change -
> maybe even worse.
> 
> So, I know I have plenty of exit and plenty of
> intake - what gives? AHA,
> must be a flow problem into the oil cooler. I
> removed the thermostat - just
> sure that it would get better. Took a quick trip
> around the pattern today
> and it is definitely - WORSE.  How can this be?  Got
> down after my quick
> trip around the pattern and put my hand on the end
> of the oil cooler
> farthest from the inlet and outlets - cool to the
> touch - not even warm!!
> How can that be? The oil temperature is still
> reading 180 degrees after it's
> been shut down for 5 minutes!
> 
> Anyone have any ideas on how the check and clear a
> potentially clogged $575
> oil cooler? 
> 
> Joe Hull
> Cozy Mk-IV #991 (In Phase1 Flight Test - 30.1 hrs
> flown) 
> Redmond (Seattle), Washington
> 
> 
> 
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