Heat transfer
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
thats not a heat shield it is a fire blanket, that has some noise deadening feature
the plastic clips that hold it up melt and the fibreglass cloth shield falls over the engine and smothers the fire.
i tossed mine
became soaked and full of mud and started to rest on the engine.
the plastic clips that hold it up melt and the fibreglass cloth shield falls over the engine and smothers the fire.
i tossed mine
became soaked and full of mud and started to rest on the engine.
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
I had my headers coated before installation with a black satin thermal barrier coat. I did it for performance reasons such as keeping exhaust velocity with a side benefit of reducing under hood heat. Never came close to any overheating issues before or after installation, but I would guess that there is a 20-30 degree drop in under the hood temperatures in the summer. The headers run cool enough from the outside that you can't feel heat emitting from them after a half hour freeway drive immediately after turning the engine off. Cermakrome or Jet Hot coatings do pretty much the same thing, albeit with a lower ceiling temperature.