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Date: Fri, 03 Feb 2012 08:02:36 -0500
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Subject: Re: [LML] Cabin heat
References: <list-5374453@logan.com>
From: N20087 <n20087@yahoo.com>
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Peter=20

I had the same concern with respect to wasting valuable head pressure in the=
 plenum.  I compromised since I did not want to stress the exhaust.  What I d=
id was add some scat to the exit of the heater valve which was mounted at th=
e lower end of the firewall. I chocked the scat into a duckbill which should=
 maintain back pressure but with enough of a gap (3/8 inch) to allow cooling=
 air to pass over the exhaust in the heat exchanger.  I don't see any eviden=
ce of significant heating on the exhaust down tube inside the exchanger or t=
he cylinder head

Thanks

Tom

Sent from my iPad

On Feb 2, 2012, at 8:49 AM, Peter Sokolowski <air.peter@googlemail.com> wrot=
e:

> I am routing my cabin heat hoses and the follwoing was braought to my atte=
ntion.
> =20
> Presently I take the pressured air from my plenum, than to the heat exchan=
ger mounted on the exhaust and routing the heated air to the valve which I c=
an open for cabin heat or close it. If I close it, the air gets blocked at t=
he valve as I thought it is better to block it rather to dump the heated air=
 to the cowling. Reason for that is that I get the air from the plenum and d=
umping it to the plenum reduces the available air to cool the engine and red=
uces the pressure difference between the plenum and the cowling.
> =20
> Now a friend mentioned that I might get a heat blocking at the heat exchan=
ger with undefined consequences. So to say better dump the air to the cowlin=
g rather than getting a cracked exhaust.
> =20
> What is your experience / opinion ?
> =20
> Thanks in advance,
> =20
> Peter
> D-EPSO, LNC 360 MKII (95%)