View Poll Results: To wrap manifold or not
Wrap it up!!
26
45.61%
Keep her raw!!
31
54.39%
Voters: 57. You may not vote on this poll
Wrap tubular manifold or not??
http://www.cerakotehightemp.com/
I use the above coatings instead of wrapping. It is very easy to DIY if you have access to a sandblaster.
I use the above coatings instead of wrapping. It is very easy to DIY if you have access to a sandblaster.
Wrapping increases the chance for cracking simply because it keeps more heat in, raising the metal temperature. It does EXACTLY what it is supposed to do, trap heat in the exhaust system instead of releasing it into the engine bay. If ceramic coating worked as well as wrapping does, it too would lead to cracking also.
Easy test for the brave.
Go do a drag pass with your high end ceramic coating, pop the hood and put your hand on the header...(don't really, because it will burn the **** out of you).
Do the same with a wrapped header...you actually can put a hand on it for several seconds if it was done right without getting burned. YES, it blocks heat that much better.
Fact is, no matter how great that coating is, it's still EXTREMELY thin. You can have an exceptional insulator, but heat transfer is related to 1/t where "t" is the thickness of the material. When the good coatings are 0.010"-0.020" thick at most, they just can't compare to a "good" insulator that is nearly 1/8" thick. That's without even considering the heat transfer effect caused by contact between the materials. The heat transfer to the fiberglass only touching some of the pipe at the macro level will transfer less heat than the ceramic that is in contact with the metal at the micro level.
Easy test for the brave.
Go do a drag pass with your high end ceramic coating, pop the hood and put your hand on the header...(don't really, because it will burn the **** out of you).
Do the same with a wrapped header...you actually can put a hand on it for several seconds if it was done right without getting burned. YES, it blocks heat that much better.
Fact is, no matter how great that coating is, it's still EXTREMELY thin. You can have an exceptional insulator, but heat transfer is related to 1/t where "t" is the thickness of the material. When the good coatings are 0.010"-0.020" thick at most, they just can't compare to a "good" insulator that is nearly 1/8" thick. That's without even considering the heat transfer effect caused by contact between the materials. The heat transfer to the fiberglass only touching some of the pipe at the macro level will transfer less heat than the ceramic that is in contact with the metal at the micro level.
Last edited by 03whitegsr; Jul 11, 2012 at 01:33 PM.
I coated my manifold on my Galant vr4 when I had it. I also wrapped it. Before the coating and wrap it was causing the powercoating on my valve cover to bubble. Its was also startign to cause issues with my carbon fiber hood. The hood would get so hot you could not put your hand on it. After coating and wrapping the manifold the hood was only warm. I ran that same manifold for 5 years and it never cracked.
I just ordered a new toxic fab manifold for my evo and will be coating and wrapping that as well.
I just ordered a new toxic fab manifold for my evo and will be coating and wrapping that as well.
Wrapping increases the chance for cracking simply because it keeps more heat in, raising the metal temperature. It does EXACTLY what it is supposed to do, trap heat in the exhaust system instead of releasing it into the engine bay. If ceramic coating worked as well as wrapping does, it too would lead to cracking also.
Easy test for the brave.
Go do a drag pass with your high end ceramic coating, pop the hood and put your hand on the header...(don't really, because it will burn the **** out of you).
Do the same with a wrapped header...you actually can put a hand on it for several seconds if it was done right without getting burned. YES, it blocks heat that much better.
Fact is, no matter how great that coating is, it's still EXTREMELY thin. You can have an exceptional insulator, but heat transfer is related to 1/t where "t" is the thickness of the material. When the good coatings are 0.010"-0.020" thick at most, they just can't compare to a "good" insulator that is nearly 1/8" thick. That's without even considering the heat transfer effect caused by contact between the materials. The heat transfer to the fiberglass only touching some of the pipe at the macro level will transfer less heat than the ceramic that is in contact with the metal at the micro level.
Easy test for the brave.
Go do a drag pass with your high end ceramic coating, pop the hood and put your hand on the header...(don't really, because it will burn the **** out of you).
Do the same with a wrapped header...you actually can put a hand on it for several seconds if it was done right without getting burned. YES, it blocks heat that much better.
Fact is, no matter how great that coating is, it's still EXTREMELY thin. You can have an exceptional insulator, but heat transfer is related to 1/t where "t" is the thickness of the material. When the good coatings are 0.010"-0.020" thick at most, they just can't compare to a "good" insulator that is nearly 1/8" thick. That's without even considering the heat transfer effect caused by contact between the materials. The heat transfer to the fiberglass only touching some of the pipe at the macro level will transfer less heat than the ceramic that is in contact with the metal at the micro level.
Your test is hilarious but I still think I would not even touch the wrapped header after a drag pass... im not that crazy lol
Thanks for the insight and great information
I coated my manifold on my Galant vr4 when I had it. I also wrapped it. Before the coating and wrap it was causing the powercoating on my valve cover to bubble. Its was also startign to cause issues with my carbon fiber hood. The hood would get so hot you could not put your hand on it. After coating and wrapping the manifold the hood was only warm. I ran that same manifold for 5 years and it never cracked.
I just ordered a new toxic fab manifold for my evo and will be coating and wrapping that as well.
I just ordered a new toxic fab manifold for my evo and will be coating and wrapping that as well.
I wonder if you could actually get a manifold nickel plated and if it would stay on after lots of heat cycles...
That would greatly reduce the potential for high temperature oxidization on the outside and prevent carbon percipitation into the metal from the exhaust on the inside.
That would greatly reduce the potential for high temperature oxidization on the outside and prevent carbon percipitation into the metal from the exhaust on the inside.
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