Quote:
Originally Posted by christofoo
The exhaust gas gets up to around 500-600 C, but exterior to the pipe nowhere near that hot. I put a K-type thermistor inside the cat shell, for my curiosity, on my Corolla which has the cat located under the floor. My highest reading was 260 C, IIRC. Inside the engine bay with grille blocks it could be hotter, but I'd bet against anything much over 350 C, even touching the exhaust manifold.
I remember someone around here having a fire blanket attached to the hood. I can't find the thread or remember who it was.
EDIT: I remember now:
http://ecomodder.com/forum/showthrea...tml#post333037 |
I can't help but play devil's advocate, the exhaust components may be ~300 C when surrounded by 80 C air, but if you put an insulative material over them, the pipe could get a lot closer to exhaust gas temp.
Still, exhaust gas itself isn't that much hotter than the max fire blanket rating. I think if you don't go out of your way to create a hazard, i.e. multiple layers of fire blanket all the way around part of the exhaust, you'll very likely end up with a significant safety margin.
That's my guess, FWIW.
BTW, I'm pretty sure lean burn is cooler than stoichiometric (conservation of energy).