[Healeys] HEAT SHIELDS

[michaelsalter at gmail.com]

Hi Gary,

You make a very good point but John is correct in saying that modern vehicles use sheet metal on standoffs as heat-shields. I know this because I just had to re-secure the one between the catalytic converter and the driveshaft and floor of my old beater Subaru.

I'm wondering if the metal heat-shields prevent radiant heat from reaching the floors and other protected components directly. 

My guess is that the air flow around the metal heat-shield keeps the temperature of the surface of the heat-shield facing the protected components considerably cooler thus decreasing the volume of radiated heat.

That said I only got a D+ in thermodynamics so I'm sure there are smarter people that me out there who can advise.






Michael S

BN1 #174





From: warthodson at aol.com
Sent: bWednesdayb, bAprilb b2b, b2014 b10b:b43b bAM
To: john spaur, dayton21 at comcast.net
Cc: healeys at autox.team.net





Metal is a terrible insulator, it is a good conductor. You want a material
that retards the conduction & radiation of the heat & can withstand the
temperatures & moisture it is exposed to.
Gary Hodson


-----Original Message-----
From: john spaur <jmsdarch at sbcglobal.net>
To: Mitch <dayton21 at comcast.net>
Cc: healeys <healeys at autox.team.net>
Sent: Tue, Apr 1, 2014 7:01 pm
Subject: Re: [Healeys] HEAT SHIELDS


Try using metal on stand offs like contemporary cars. Asbestos or any
other material heats up and retains the heat. Metal shields will
dissipate the heat better.

John
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