On Sat, 30 Aug 1997, Adrian Jones wrote:
> 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?
*** The lower the number the thicker the metal. If you took 2
pieces of metal and seperated them with some washers the air would act as
an insulator. Take a look under a regular car at the cataltic converter
they all have heat shields on them and only use one piece of metal. The
key is the air space.
...Art
> 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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