Heat shield
Le Mans Master
Joined: Oct 2004
Posts: 5,269
Likes: 54
From: Orlando Florida
St. Jude Donor '05
Originally Posted by 69'Silver
Go to your home center and get some Reflectix. I just did my car and it is very easy to work with. They have it in 16,24 & 48" rolls, $16-30 bucks. Get some 3M 77 adhesive also.
A lot cheaper and just as good. I bought a "insulation blanket" for a water heater, it's rockwool almost 1/2" thick with aluminum on both sides.... $20 and it's enough to cover most of the front and firewall
Instructor
Joined: Dec 2005
Posts: 241
Likes: 0
From: Aubrey TX
Originally Posted by 69'Silver
Go to your home center and get some Reflectix. I just did my car and it is very easy to work with. They have it in 16,24 & 48" rolls, $16-30 bucks. Get some 3M 77 adhesive also.
Isn't the Reflectix like bubble wrap with aluminum foil on one side?
Would you place foil side down to reflect engine/header heat?
Instructor
Joined: Dec 2005
Posts: 241
Likes: 0
From: Aubrey TX
Originally Posted by 69'Silver
Relectix is foil backed on both sides.
HMMMM, I must have some old stuff then. I bought some for a project several years ago and it was foil on one side only.
If I want to use what I have the foil would face down to reflect the heat, correct?
Thread Starter
Racer
Joined: Sep 2005
Posts: 407
Likes: 0
From: Fort Washington PA
I am familiar with the FBF (Foil Bubble Foil) material but once the air in the bubble gets hot, the heat will transfer through, it may take a little longer but the temps will still climb. I have in-floor radiant heat in my house with the FBF material in the joists to direct the heat up to the living area, once the FBF gets hot, the heat goes right through that stuff. I ended up insulating with fiberglass then putting the FBF material over that. Obviously there isn't any room for the fiberglass in the vette.
I think I would prefer to use a material specifically designed to keep heat from migrating into the cabin. The material that Summit is advertising states it's good for up to 2000 degrees. (which is just slightly hotter than what I experience in the cab
). but whose ever going to test that? I just want a "space age" material that will solve the problem.
But how much, 3 sq/ yards? 5? The stuff is not that expensive, I just don't want to order 3 sheets and find out I needed 4.
I think I would prefer to use a material specifically designed to keep heat from migrating into the cabin. The material that Summit is advertising states it's good for up to 2000 degrees. (which is just slightly hotter than what I experience in the cab
). but whose ever going to test that? I just want a "space age" material that will solve the problem.But how much, 3 sq/ yards? 5? The stuff is not that expensive, I just don't want to order 3 sheets and find out I needed 4.
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Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
The way it is shown in the pic is ( my opinion ) useless as reflective only works with direkt radiation. But here is still the floor in between the heat source ( from Exhaust, engine ), so that normal insulation material will do a just as good job. The silver reflective material is Ok to use direct agianst radiation heat.( for example around the starter motor or on the firewall on engine side. )
I might be wrong, but don't realy think so.
Günther
The way it is shown in the pic is ( my opinion ) useless as reflective only works with direkt radiation. But here is still the floor in between the heat source ( from Exhaust, engine ), so that normal insulation material will do a just as good job. The silver reflective material is Ok to use direct agianst radiation heat.( for example around the starter motor or on the firewall on engine side. )
I might be wrong, but don't realy think so.
Günther
Thread Starter
Racer
Joined: Sep 2005
Posts: 407
Likes: 0
From: Fort Washington PA
I agree, you need a material that will block the radiant heat. Air is a good insulator but not by itself and not sandwiched between 2 layers of foil. Once the steel floor and surrounding metal heats up, they act like radiators. The heat will go right through the FBF material. The material has to be able to stop the radiant heat and not let it pass through.
The reflective properties of the FBF material is good if you have an air gap and are trying to reflect heat away. Once that stuff comes in direct contact with the heat source, in this case the floor and surrounding metal, it goes though.
Case in point: take a simple propane burner, and direct the flame at the FBF material, you can feel the heat but you can touch the foil. It'll work as long as the temperature stays below the melting point of the plastic bubble material. Now put the FBF on your electric cooktop and see how long you can keep your hand on it. (don't try this at home).
I want the stuff you can put on the cooktop and keep your hand on, even on high!
The reflective properties of the FBF material is good if you have an air gap and are trying to reflect heat away. Once that stuff comes in direct contact with the heat source, in this case the floor and surrounding metal, it goes though.
Case in point: take a simple propane burner, and direct the flame at the FBF material, you can feel the heat but you can touch the foil. It'll work as long as the temperature stays below the melting point of the plastic bubble material. Now put the FBF on your electric cooktop and see how long you can keep your hand on it. (don't try this at home).
I want the stuff you can put on the cooktop and keep your hand on, even on high!
