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Date: Sun, 05 Feb 2012 08:35:44 -0500
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Cabin heat
In-Reply-To: <listdigest-5382600@logan.com>
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Grayhawk,=0AI like your idea of a restrictor, but why not put it on the out=
let of the heater valve? =A0That way there will be no restriction to the he=
ater in the wintertime, but the flow through the system will be restricted =
in the summertime when you need maximum engine cooling. =A0And I think it d=
oesn't mater (much) where the heater air is tapped off - the plenum is just=
 that, so any air removed reduces the pressure in the plenum and hence cool=
ing flow.=0A=0AUnknowns? =A0Ignore them :-)=0AGary=0A=0AGary, et al,=0A=A0=
=0AThere are many ways to skin a cat.=A0 I take cabin heatmuff intake air f=
rom the lower horizontal=A0baffling aft of the prop flange via a 1.5 in sca=
t tube.=A0 There is no restriction on the air that is dumped into the lower=
 cowl if the cabin heat valve is closed.=A0 This intake location=A0does not=
 alter the cooling air distribution to the cylinders.=0A=A0=0A=A0Now, let's=
 talk about temperatures. In the colder months, engine cooling is less of a=
 problem because the intake air is cooler and the separate intake for the o=
il cooler is partially closed to keep the oil temp indication=A0up close to=
 180.=A0 This is cooling neutral.=A0 Let's also remember that the pressure =
in the cockpit is much=A0lower than that in the upper cowl.=A0 Thus, there =
is no problem in getting hot air into the cockpit and I seldom have the hea=
ter control fully open when the sun is also helping with keeping the cockpi=
t warm.=A0 =A0=0A=A0=0AIn the warmer months, a=A0restriction=A0plate is att=
ached to the=A0intake air opening that changes it from the 1.5" to about .6=
" and, if=A0the cabin heat valve is closed, that=A0lesser amount of air pas=
ses through the muff and is dumped in the lower cowl.=A0 Thus, no super hea=
ting of the pipe surrounded by the muff=A0nor will the muff itself radiate =
high heat in the lower cowl.=A0 This may also=A0allow more of the upper cow=
l air to be routed over the cylinders to compensate for the warmer cooling=
=A0air coming in to the upper cowl.=A0 The oil cooler intake air door is op=
en wide and the oil=A0contributes to overall engine cooling.=A0 This is als=
o cooling neutral.=0A=A0=0ATry not to let the unknown unknowns get ya......=
=0A=A0=0AHmmmmm....=A0 Never mind.=0A=A0=0AGrayhawk
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Grayhawk,</div=
><div>I like your idea of a restrictor, but why not put it on the outlet of=
 the heater valve? &nbsp;That way there will be no restriction to the heate=
r in the wintertime, but the flow through the system will be restricted in =
the summertime when you need maximum engine cooling. &nbsp;And I think it d=
oesn't mater (much) where the heater air is tapped off - the plenum is just=
 that, so any air removed reduces the pressure in the plenum and hence cool=
ing flow.</div><div><br></div><div>Unknowns? &nbsp;Ignore them :-)</div><di=
v>Gary</div><div><br></div><div><span class=3D"Apple-style-span" style=3D"f=
ont-family: Arial; font-size: small; "><div>Gary, et al,</div><div>&nbsp;</=
div><div>There are many ways to skin a cat.&nbsp; I take cabin heatmuff int=
ake air from the lower horizontal&nbsp;baffling aft of the prop flange via
 a 1.5 in scat tube.&nbsp; There is no restriction on the air that is dumpe=
d into the lower cowl if the cabin heat valve is closed.&nbsp; This intake =
location&nbsp;does not alter the cooling air distribution to the cylinders.=
</div><div>&nbsp;</div><div>&nbsp;Now, let's talk about temperatures. In th=
e colder months, engine cooling is less of a problem because the intake air=
 is cooler and the separate intake for the oil cooler is partially closed t=
o keep the oil temp indication&nbsp;up close to 180.&nbsp; This is cooling =
neutral.&nbsp; Let's also remember that the pressure in the cockpit is much=
&nbsp;lower than that in the upper cowl.&nbsp; Thus, there is no problem in=
 getting hot air into the cockpit and I seldom have the heater control full=
y open when the sun is also helping with keeping the cockpit warm.&nbsp; &n=
bsp;</div><div>&nbsp;</div><div>In the warmer months, a&nbsp;restriction&nb=
sp;plate is attached to the&nbsp;intake air opening that changes it
 from the 1.5" to about .6" and, if&nbsp;the cabin heat valve is closed, th=
at&nbsp;lesser amount of air passes through the muff and is dumped in the l=
ower cowl.&nbsp; Thus, no super heating of the pipe surrounded by the muff&=
nbsp;nor will the muff itself radiate high heat in the lower cowl.&nbsp; Th=
is may also&nbsp;allow more of the upper cowl air to be routed over the cyl=
inders to compensate for the warmer cooling&nbsp;air coming in to the upper=
 cowl.&nbsp; The oil cooler intake air door is open wide and the oil&nbsp;c=
ontributes to overall engine cooling.&nbsp; This is also cooling neutral.</=
div><div>&nbsp;</div><div>Try not to let the unknown unknowns get ya......<=
/div><div>&nbsp;</div><div>Hmmmmm....&nbsp; Never mind.</div><div>&nbsp;</d=
iv><div>Grayhawk</div></span></div>  </div></body></html>
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