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Subject: Re: [FlyRotary] Re: Cooling Details.
From: Stephen Izett <steveizett@me.com>
In-reply-to: <list-5601463@logan.com>
Date: Fri, 15 Jun 2012 22:11:52 +0800
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Thanks Tracy.
Do you have any photos of your mod?

Steve Izett
On 15/06/2012, at 8:57 PM, Tracy wrote:

> Engine cooling seems to be an almost universal challenge to =
alternative engine users.  As I make small changes to my system I am =
more and more convinced that it is all the details and parts of the =
system that makes it a success or failure, not just one key part like =
size of the heat exchanger.   This conclusion was recently reinforced =
while working with another RV builder who has an almost identical =
cooling system (at least in verbal description, I haven't actually seen =
it) to my own.  Mine is working OK, his is overheating.
>=20
> Last week's cooling experiment result was a surprise to me.  My RV-8 =
cooling system was already adequate but on climb out on hot days the oil =
temps would still be at redline with full power and that makes me feel =
like I have less margin than I'd like.  Hoping to loose a couple of =
degrees I decided to smooth the sides of the exit duct where the air has =
to go around the 3/4" flange of the firewall for about 2" on both sides =
of the exit.  I had already increased the radius of the stock firewall =
at the top of the exit.   Just adding a small piece of sheet aluminum to =
the sides of the exit was the change.  Took about 10 minutes to make and =
install.  They form a ramp to guide the air over the firewall flange so =
the air doesn't get tripped up going over it.  At least that was the =
theory.   The improvement was all out of proportion to what I expected.  =
Don't know the exact number of degrees but it's enough to make a world =
of difference in my comfort when I'm scanning the gauges on climb out. =20=

>=20
> This obviously  is not a magic answer to all cooling problems but I =
think it illustrates that any one of many details can be the weak link =
in your cooling system. =20
>=20
> Tracy
> --
> Homepage:  http://www.flyrotary.com/
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