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Date: Fri, 13 Jan 2012 06:26:16 -0500
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Subject: Re: [LML] Re: Ceramic exhaust coatings
References: <list-5347989@logan.com>
From: Randy <randylsnarr@yahoo.com>
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One other thought, I have heard both sides of this argument before as well. I=
 also heard it is nearly impossible to weld / repair pipes with this coating=
. I found a solution that solved the problem cheaply without making the pipe=
s more difficult to weld. I wrapped my entire exhaust system with hot rod ex=
haust wrap. I bought it at the local auto parts store in the 1" width. Spruc=
e sells it as well. I tested the stuff with a torch in the hangar on my hand=
 and was amazed how well it insulates. I have 2 layers in some very hot plac=
es on the pipes. In addition to reducing the inner cowl temps, It also tames=
 the vibration of the pipes and reduces noise.=20
Cheap, relatively light and effective...
Fwiw.

Randy Snarr
N694RS
235/320

Sent from my iPad

On Jan 12, 2012, at 1:41 PM, Colyn Case <colyncase@earthlink.net> wrote:

> I think it is about radiation.   The reason I did it was to reduce the amo=
unt of heat radiated back at the cylinder heads.   While a shiny  reflector m=
ight be more effective in theory, installing it everywhere you would want it=
 on a TSIO550  exhaust system is a lot of work.  =20
>=20
>=20
> On Jan 12, 2012, at 8:46 AM, Gary Casey wrote:
>=20
> I guess I'm just not convinced about the effectiveness of typical ceramic c=
oatings.  =46rom what I can find out they are typically .001 to .002 thick, a=
bout 5% of the thickness of the metal.  In order to significantly reduce the=
 heat transfer compared to the metal, they would have to have thermal conduc=
tivity in that order compared to steel.  I can't find out what material is u=
sed, but some might use zirconia, a very good insulator, which has about 10 t=
o 20% of the conductivity of steel.  But that's not the whole story.  Inside=
 the pipe is a gas at perhaps 1500F moving at a relatively high velocity.  T=
he conductivity to the metal is therefore relatively good, resulting in a me=
tal temperature of probably 1200F.  The air on the outside is at about 180F a=
nd it is moving slowly, so the heat transfer from the pipe to the air is "po=
or."  My guess is that the surface temperature of the ceramic is going to be=
 very close to what the metal would be without the coating.  There just isn'=
t enough thickness for it to be well insulated.  Swain Technologies has a pr=
oprietary process that puts .015 thickness on metal and that would probably w=
ork.  A big factor in heat transfer is radiation and the best way to reduce t=
hat is with a shiny metal surface spaced away from the exhaust pipe, or from=
 the device to be protected.
>=20
> Maybe ceramic coatings work well, but I'm afraid I'm not convinced.
>=20
> Gary Casey
> ES 157
>=20

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<html><head></head><body bgcolor=3D"#FFFFFF"><div>One other thought, I have h=
eard both sides of this argument before as well. I also heard it is nearly i=
mpossible to weld / repair pipes with this coating. I found a solution that s=
olved the problem cheaply without making the pipes more difficult to weld. I=
 wrapped my entire exhaust system with hot rod exhaust wrap. I bought it at t=
he local auto parts store in the 1" width. Spruce sells it as well. I tested=
 the stuff with a torch in the hangar on my hand and was amazed how well it i=
nsulates. I have 2 layers in some very hot places on the pipes. In addition t=
o reducing the inner cowl temps, It also tames the vibration of the pipes an=
d reduces noise.&nbsp;</div><div>Cheap, relatively light and effective...</d=
iv><div>Fwiw.</div><div><br></div><div>Randy Snarr</div><div>N694RS</div><di=
v>235/320</div><div><br>Sent from my iPad</div><div><br>On Jan 12, 2012, at 1=
:41 PM, Colyn Case &lt;<a href=3D"mailto:colyncase@earthlink.net">colyncase@=
earthlink.net</a>&gt; wrote:<br><br></div><div></div><blockquote type=3D"cit=
e"><div>I think it is about radiation. &nbsp; The reason I did it was to red=
uce the amount of heat radiated back at the cylinder heads. &nbsp; While a s=
hiny &nbsp;reflector might be more effective in theory, installing it everyw=
here you would want it on a TSIO550 &nbsp;exhaust system is a lot of work. &=
nbsp;&nbsp;<div><br></div><div><br><div><div>On Jan 12, 2012, at 8:46 AM, Ga=
ry Casey wrote:</div><br class=3D"Apple-interchange-newline"><div><div style=
=3D"color:#000; background-color:#fff; font-family:bookman old style, new yo=
rk, times, serif;font-size:12pt"><div>I guess I'm just not convinced about t=
he effectiveness of typical ceramic coatings. &nbsp;=46rom what I can find o=
ut they are typically .001 to .002 thick, about 5% of the thickness of the m=
etal. &nbsp;In order to significantly reduce the heat transfer compared to t=
he metal, they would have to have thermal conductivity in that order compare=
d to steel. &nbsp;I can't find out what material is used, but some might use=
 zirconia, a very good insulator, which has about 10 to 20% of the conductiv=
ity of steel. &nbsp;But that's not the whole story. &nbsp;Inside the pipe is=
 a gas at perhaps 1500F moving at a relatively high velocity. &nbsp;The cond=
uctivity to the metal is therefore relatively good, resulting in a metal tem=
perature of probably 1200F. &nbsp;The air on the outside is at about 180F an=
d it is moving slowly, so the heat
 transfer from the pipe to the air is "poor." &nbsp;My guess is that the sur=
face temperature of the ceramic is going to be very close to what the metal w=
ould be without the coating. &nbsp;There just isn't enough thickness for it t=
o be well insulated. &nbsp;Swain Technologies has a proprietary process that=
 puts .015 thickness on metal and that would probably work. &nbsp;A big fact=
or in heat transfer is radiation and the best way to reduce that is with a s=
hiny metal surface spaced away from the exhaust pipe, or from the device to b=
e protected.</div><div><br></div><div>Maybe ceramic coatings work well, but I=
'm afraid I'm not convinced.</div><div><br></div><div>Gary Casey</div><div>E=
S 157</div>  </div></div></div><br></div></div></blockquote></body></html>=

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