You can find a table of sheet metal thickness versus "gauge" number by
going to www.pemnet.com, clicking on design tools and info, then clicking
on useful information. For comparison, I measure the heat shield for a
1275 engine at 0.044" thick. The shield is painted black on the carburetor
side, and silver on the manifold side.
Steve Byers
Havelock, NC
'73 Midget GAN5UD126009G "OO NINE"
'66 BJ8 HBJ8L/36666 "TARHEELY"
'63 BJ7 HBJ7L/20111 ("Resting" the last 10 years)
"It is better to remain silent, and be thought a fool,
than to speak, and remove all doubt." -- Mark Twain
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From: Adrian Jones <AdrianJones@compuserve.com>
To: MG <mgs@autox.team.net>
Subject: Home-made Heat Shield
Date: Saturday, August 30, 1997 8:15 AM
Hi Folks,
There does not appear to be a source for a new or used heat shield
for the 1975 MG Midget. Moss part # 375-480 (Anyone got one for sale?)
The one I made a while back hasn't cured the vapor lock problem - maybe it
was too thin. (I cut it from roof-flashing).
Here's the interesting bit - what color should it be? The shield
fits between the carb and the exhaust manifold. After much (?) thought,
the top surface, adjacent to the carb, should be black (so as to retain
heat) and the bottom surface, next to the exhaust manifold, should be white
or shiny metal, to reflect the heat back down. What do you think?
Actually, it would be nice to attach some insulating material to
the shield. The only readily available stuuff that comes to mind is that
"Reflectix" - looks like Reynolds Wrap sandwiching bubble wrap - comes
from Lowes, Home Depot etc. This would be favorite for gluing to the
underside of the shield. Trouble is, it is not tolerant to high heat and
would probably shrivel up, melt, smolder, ignite and set the carb on fire.
Is asbestos totally unavailable?
Where would you go to for a piece of metal for this shield and what
"gauge" . How is "gauge" related to thickness, BTW.
TIA, Adrian
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