Can someone tell me what temperature an exhaust header may reach ?

[Adele AW]

Can someone tell me what temperature an exhaust header may reach, or normally reaches  ?

Just need to confirm in Fahrenheit or Celcius!

Thanks....

[Martin Greaves]

If you place your hand on it, here are the answers -

A - If you can hold it it's cold.

B - If you can touch it a little then its a little warmer

C - If you get third degree burns then I would guess at 180 degrees

D - If you get second degree burns then 250 degrees

E - If you are cremated then I guess its too hot.

Hope that helps.

Martin

[Adele AW]

Ho, Ho, Ho.

Anyone else with a more suitable response ?   

[Martin Greaves]

Ok Ok Ok

I have only got the measurements in Kelvin.....Is that ok?

Martin

[Fasterbrit]

Nominal mild carbon steel:

700 c dark red
800 c dull cherry red
900 c cherry red
1000 c bright cherry red
1100 c orange-red
1200 c orange-yellow
1300 c yellow-white
1400 c white welding heat
1500 c brilliant white

My guess is on the dyno where there is not much air flow you could reach 700 - 1000 degrees C, so rather toasty

[BeetleBug]

I got 480 degrees C during my dyno session. It did vary a lot depending where I measured it. It is obvious hotter the closer to the exhaust port you get and where you have "sharp" bends. Mind you that my engine run on E85, turbo, cooling tins.

[Adele AW]

Thanks Guys. Im making an Engine diaper and trying to work out which outer material will work best, its not going to sit directly on the exhaust but within an inch or two, just working out what temperature i need to bear in mind.

[BeetleBug]

Thanks Guys. Im making an Engine diaper and trying to work out which outer material will work best, its not going to sit directly on the exhaust but within an inch or two, just working out what temperature i need to bear in mind.

Adele, you should consider making a tray. The best one I have seen was Tekkens old one. With a tray you can see if you have a leak and also allow air under your engine.

[Tekken]

Here you go 

[Adele AW]

Thanks Kalle/Stian. At the moment i dont have time to build something quite as good as that, but i have seen a tray that will be slightly easier for me to do before next week, so i think we will go with that option. Its slightly difficult as we dont run wheelie bars to find somewhere to mount the tray too, but i have an idea.

This is the one im looking at, although i will mount it closer to the engine, rather than so far down.


We are looking at something like this for the new/next motor, i think this is fantastic, and aslong as it is taken off each run for the motor to cool then so far i have not read too many bad reports of overheating.

[Phil West]

Ho, Ho, Ho.

Anyone else with a more suitable response ?   

Hi Adele,

Just after a run I was seeing 250C using the infra red temp gauge with the laser pointed at the exhaust flange next to the head.  Hope that helps!

Cheers
Phil

[Adele AW]

Hi Adele,

Just after a run I was seeing 250C using the infra red temp gauge with the laser pointed at the exhaust flange next to the head.  Hope that helps!

Cheers
Phil

Excellent, Thanks Phil