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Bill
Great recommendation. I have seen the air gap type of heat shield on other =
applications that seem to work well.
Perry
Sent from Mail for Windows 10
From: WILLIAM B LAWRENCE
If =C2=A0I 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 plates. =
What you are doing is interrupting the transmission of radiant energy from =
the manifold. A single layer of sheetmetal will stop 90% of radiant energy =
directed at it and convert it to heat. The second layer will stop 90% radia=
ted from the first sheet. Air flow between the sheets will remove heat from=
the assembly through convection. I think that if the heat shield were desi=
gned so that there was no line of sight from the manifold to the carburetor=
s you would nearly eliminate most carb heating problems. The exception woul=
d be when the hot engine is stopped and there is no air flow at which time =
the entire engine bay becomes soaked with heat.
Bill Lawrence
Elton
On Mon, Nov 11, 2019 at 3:09 PM Harold Manifold <manifold@telus.net> wrote:
Help,
=C2=A0
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.=C2=A0The metal p=
art is fine and I just need the insulation material.
=C2=A0
Thanks.... Harold
1960 BT7
=C2=A0
=C2=A0
=C2=A0
=C2=A0
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72"><div cla=
ss=3DWordSection1><p class=3DMsoNormal>Bill</p><p class=3DMsoNormal>Great r=
ecommendation. I have seen the air gap type of heat shield on other applica=
tions that seem to work well.</p><p class=3DMsoNormal>Perry</p><p class=3DM=
soNormal><o:p> </o:p></p><p class=3DMsoNormal>Sent from <a href=3D"htt=
ps://go.microsoft.com/fwlink/?LinkId=3D550986">Mail</a> for Windows 10</p><=
p class=3DMsoNormal><o:p> </o:p></p><div style=3D'mso-element:para-bor=
der-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0i=
n'><p class=3DMsoNormal style=3D'border:none;padding:0in'><b>From: </b><a h=
ref=3D"mailto:ynotink@msn.com";>WILLIAM B LAWRENCE</a><br><br><o:p></o:p></p=
></div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;color:black'>If=
I were doing this I think I would just put an extra layer of aluminu=
m sheet in place of the asbestos with some backer board discs to offset it =
maybe 5/16". Then find a way to direct some air flow between the plate=
s. What you are doing is interrupting the transmission of radiant energy fr=
om the manifold. A single layer of sheetmetal will stop 90% of radiant ener=
gy directed at it and convert it to heat. The second layer will stop 90% ra=
diated from the first sheet. Air flow between the sheets will remove heat f=
rom the assembly through convection. I think that if the heat shield were d=
esigned so that there was no line of sight from the manifold to the carbure=
tors you would nearly eliminate most carb heating problems. The exception w=
ould be when the hot engine is stopped and there is no air flow at which ti=
me the entire engine bay becomes soaked with heat.<o:p></o:p></span></p><di=
v><p class=3DMsoNormal><span style=3D'font-size:12.0pt;color:black'><o:p>&n=
bsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'font-si=
ze:12.0pt;color:black'>Bill Lawrence<o:p></o:p></span></p></div><div><div><=
div><p class=3DMsoNormal>Elton<o:p></o:p></p><div><p class=3DMsoNormal><o:p=
> </o:p></p></div></div></div><p class=3DMsoNormal><o:p> </o:p></=
p><div><div><p class=3DMsoNormal>On Mon, Nov 11, 2019 at 3:09 PM Harold Man=
ifold <<a href=3D"mailto:manifold@telus.net";>manifold@telus.net</a>> =
wrote:<o:p></o:p></p></div><blockquote style=3D'border:none;border-left:sol=
id #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0=
in'><div><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-fam=
ily:"Arial",sans-serif'>Help,</span><o:p></o:p></p></div><div><p class=3DMs=
oNormal> <o:p></o:p></p></div><div><p class=3DMsoNormal><span style=3D=
'font-size:10.0pt;font-family:"Arial",sans-serif'>Any suggestions on the be=
st material to make a carburetor heat shield. I won't re-use the original a=
sbestos part for obvious reasons. The metal part is fine and I just ne=
ed the insulation material.</span><o:p></o:p></p></div><div><p class=3DMsoN=
ormal> <o:p></o:p></p></div><div><p class=3DMsoNormal><span style=3D'f=
ont-size:10.0pt;font-family:"Arial",sans-serif'>Thanks.... Harold</span><o:=
p></o:p></p></div><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt=
;font-family:"Arial",sans-serif'>1960 BT7</span><o:p></o:p></p></div><div><=
p class=3DMsoNormal> <o:p></o:p></p></div><div><p class=3DMsoNormal>&n=
bsp;<o:p></o:p></p></div><div><p class=3DMsoNormal> <o:p></o:p></p></d=
iv><div><p class=3DMsoNormal> <o:p></o:p></p></div></div></blockquote>=
</div></div><p class=3DMsoNormal><o:p> </o:p></p></div></body></html>=
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