How hot does an exhaust get?

[MattHirst]

I was just wondering today, how hot does an exhaust roughly get?

When its raining, and im at a standstill (or just parked up with engine off), the rain hits my exhaust and evaporates immediatley.....and if you touch it, it bloody hurts (not intentional )

So, does the 'outer skin' get a lot hotter than the inner part (mines got a tube that extends from the downpipe and goes right into the 'core' of the exhaust where all the baffles are).....or does the inner parts get a lot hotter than the outer parts?

[stinkwheel]

Well, I've seen steel header pipes glowing dark red before when they get really hot.

When you're heat treating steel, "dark red" is roughly 700°C.

[mchaggis]

The inside of an exhaust gets far hotter than the outside. The double skin is there to reduce the temperature of the outside, to look more impressive (bigger pipes, bigger engine). Combustion exhaust gas temperatures can be in excess of 1000 degrees C, but are typically about 800 degrees C. Heat is dissipated as it goes back through the exhaust pipes, but not by all that much. The cans will usually be hot enough to burn you too, but should be at a lower temperature than the rest of it.
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[The Tot]

Downpipes as stinkwheel rightly said can get hot as 700 degrees. Exhaust gases are about 500-800 degrees celsius.

Depending on the material of your pipe and can, each material has different heat capacities and heat flow rates. I like carbon fibre cans because they insulate their heat well. Touch a carbon can after use and it won't be as hot as a stainless steel one.
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[MattHirst]

Well, i think mines made out of monkey metal and chrome plated

I didn't realise exhausts could get that hot though ...it has suprised me actually, i was expecting people to say 200/300 at the most

Anyway, thanks guys....was a really pointless question but it had been annoying me for weeks trying to find out

[stinkwheel]

Found this picture. The can get REALLY hot!
https://www.yourdailymedia.com/i/u/sxNaNgGW.jpg

"Bright cherry red" is about 1000°C. I suspect this bike is running pretty lean.

[Rookie]

How hot do brake discs get when they've had a pounding? I remember when I used my rear brake too much once the fluid boiled and I lost all power. I hopped off, wondering why and (yes, stupidly) touched the disc with my finger. It sizzled, smelt of pork and I've got no fingerprint on the end of my index finger.

I'm assuming normal brake discs aren't just mild steel like exhaust headers, and also that the F1 cars (carbon discs?) brakes glow red hot when they're used.

[McGee]

[McGee]

On a side note:

Hot exhasut
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Its pronounced Jixxer!

[Itchy]

nice and warm ideal for winter , stick your hands on them for a second! (no more or they'll cook) when you get off for instant warmth though the clutch cover is much safer , and its safer with the back of your hands with your gloves on.
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[cagiva gezzer]

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[JonB]

It's funny cause my standard exhaust on my Bandit got really hot to the touch however my Carbon Can Co exhaust only ever gets warm. A nice warm for the winter actually can rest my hands on it and warm it up.
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[The Tot]

G, that disappointed me, you know how i like hitting the killswitch on my bikes . Could that be because of the pressure waves involved in a backfire damaging the epoxy bonds that hold the fibre weaves together? I assume you managed to blow a nice chunk out of your exhaust when doing it?
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Earl Of Easycore Pop Punk Will Never Die!

[G]

Nah, just because it doesn't get as hot, it's less good for setting fire to unbrurnt fuel pumped through.

Can still do them, but they're easier/better on metal, especially steel.

[steady eddie]

I don't mean to invade someone else's thread, but has anyone ever lagged their downpipes?

https://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=NIM11151

The downpipes on my Cat don't seem to be enjoying winter (if you can call it that ) riding as much as I am, I'm thinking this would protect them to some degree but don't know how hot things would get???????

[GearboxGeezer]

Touch after a long thrashing, then youll see

[Kickstart]

[0ddball]

Lagging tends to absorb and hold water. It can make the downpipes rot away faster.