What is the normal Exterior Temp. of the cats on my car. Does anyone know? Fred?
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Eddie
2000 M6 Trans Am
Tune+exhaust=344WHP
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Don't know. The internals have to be over 600*F before the catalyst starts to work. The internals are usually isolated from the shell by a compressed wire mesh (at least that's the way they were many years ago when I worked on designing a plant fo manufacture them). But they get hot enough to start fires if you park over leaves or dead grass.... that's why they have the heat shields.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor -
Somewhere between "hot" and "freaking hot"- Every OEM set-up I have ever seen included a heat shield between the cat and the floorpan of the vehicle- I am trying to recall if I have ever seen cats glowing red-hot. I KNOW I have seen exhaust manifolds do it-2001 Z28 A4 - 160 deg t-stat, 3.42 gears, WS6 sway bars, rear springs and shocks, UMI SFC's, Torque Arm and STB, leather Firebird seats, Borla, SLP Y-pipe and lid, ZO6 cam and springs - 332 RWHP and 346 RWTQ, not bad for 'almost stock' - work in progress
"Black, the fastest color"Comment
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Using paper as a substitute for leaves, we can assume that since the autoignition point (of paper) is 842 degrees F, than the exterior of the cat has to be above that point. Also, normal cat. internal temp, as Fred stated is above 600 degrees, and I believe I read somewhere that the cats can operate safely as high as 2200 degrees F, one can assume the exterior is somewhere between 800 and 1500 degrees.
I would not expect the exterior to get any hotter since they are air-cooled (driving allows air to pass over them), and the cases are usually insulated from the interior catalyst bed.Al 96 Ram Air T/A
Mods: Build # 784 * Hotchkis STB * SFCs * Borla cat back w/QTP cut-out * AS&M/RK Sports Mid-length headers w/single CAT * Koni SA shocks on lower perch w/ lowered rear * Strano Hollow front & rear antisway bars * 1LE front/rear springs * 1LE aluminum driveshaft * Strange 4.10 gears w/ Zexel Torsen diff. * ARP bearing cap studs & aluminum diff cover* J&M Hotpart poly/poly rear LCAs and poly/poly panhard bar * RAM Powergrip clutch w/ LT4 PP and RAM billet Al flywheel * C5 Z06 brakes * C6 Z06 wheels * Spohn T/A * Spohn DS Loop * fully custom interior w/ custom audioComment
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When your cats start to get red hot thats a perfect sign that they are clogged. They should never get red hot. Inside the cat is a different story. On my old honda The Manifold would get a very light light red in a very dark area after a long drive, but not the cat.Originally posted by Wild WillyEddie
2000 M6 Trans Am
Tune+exhaust=344WHP
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I'm going to go with "Ow that f-ing hurt" °My DD
2015 Lexus GS350 FSport
My toy
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