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If I were doing this I think I would just put an extra layer of aluminum s=
heet in place of the asbestos with some backer board discs to offset it may=
be 5/16". Then find a way to direct some air flow between the plates. What =
you are doing is interrupting the transmission of radiant energy from the m=
anifold. A single layer of sheetmetal will stop 90% of radiant energy direc=
ted at it and convert it to heat. The second layer will stop 90% radiated f=
rom the first sheet. Air flow between the sheets will remove heat from the =
assembly through convection. I think that if the heat shield were designed =
so that there was no line of sight from the manifold to the carburetors you=
would nearly eliminate most carb heating problems. The exception would be =
when the hot engine is stopped and there is no air flow at which time the e=
ntire engine bay becomes soaked with heat.
Bill Lawrence
BN1 #554
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of Elton S <eps266=
0@gmail.com>
Sent: Monday, November 11, 2019 10:03 PM
To: Harold Manifold <manifold@telus.net>
Cc: Ahealey help <healeys@autox.team.net>
Subject: Re: [Healeys] Carburetor Heat Shield BT7 Mk1
Hardy cement backerboard you can get at Home Depot or Lowe's
Elton
manifold@telus.net>> wrote:
Help,
Any suggestions on the best material to make a carburetor heat shield. I wo=
n't re-use the original asbestos part for obvious reasons. The metal part i=
s fine and I just need the insulation material.
Thanks.... Harold
1960 BT7
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<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
If I were doing this I think I would just put an extra layer of alumi=
num sheet in place of the asbestos with some backer board discs to offset i=
t maybe 5/16". Then find a way to direct some air flow between the pla=
tes. What you are doing is interrupting the
transmission of radiant energy from the manifold. A single layer of sheetm=
etal will stop 90% of radiant energy directed at it and convert it to heat.=
The second layer will stop 90% radiated from the first sheet. Air flow bet=
ween the sheets will remove heat
from the assembly through convection. I think that if the heat shield were=
designed so that there was no line of sight from the manifold to the carbu=
retors you would nearly eliminate most carb heating problems. The exception=
would be when the hot engine is
stopped and there is no air flow at which time the entire engine bay becom=
es soaked with heat.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Bill Lawrence</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
BN1 #554</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys <healeys-b=
ounces@autox.team.net> on behalf of Elton S <eps2660@gmail.com><br=
>
<b>Sent:</b> Monday, November 11, 2019 10:03 PM<br>
<b>To:</b> Harold Manifold <manifold@telus.net><br>
<b>Cc:</b> Ahealey help <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] Carburetor Heat Shield BT7 Mk1</font>
<div> </div>
</div>
<div>
<div dir=3D"ltr">Hardy cement backerboard you can get at Home Depot or Lowe=
's
<div>Elton<br>
<div><br>
</div>
</div>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Mon, Nov 11, 2019 at 3:09 PM Har=
old Manifold <<a href=3D"mailto:manifold@telus.net";>manifold@telus.net</=
a>> wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<u></u>
<div>
<div><span><font size=3D"2" face=3D"Arial">Help,</font></span></div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
<div><span><font size=3D"2" face=3D"Arial">Any suggestions on the best mate=
rial to make a carburetor heat shield. I won't re-use the original asbestos=
part for obvious reasons. The metal part is fine and I just need the =
insulation material.</font></span></div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
<div><span><font size=3D"2" face=3D"Arial">Thanks.... Harold</font></span><=
/div>
<div><span><font size=3D"2" face=3D"Arial">1960 BT7</font></span></div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
<div><span><font size=3D"2" face=3D"Arial"></font></span> </div>
</div>
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