EGT's

marvilusone

marvilusone

Well-Known Member
Joined
Oct 21, 2007
Location
Charleston, SC
How hot is too hot? Never used a pyrometer so I don't know what I should be looking for.
 
What kind of truck? exhaust size? Pre or post turbo?

Usually around 1200 deg for long periods of time is too hot.
 
It would be on a 6.9 IDI non turbo(yet). Bone stock as of now.
 
I have a 7.3 turbo that goes 1400 all the time, but not more than 3 or 4 minutes at a time. I just got a newer 6.0 and it goes to 1300 often and 1400 on occasion.
 
!

On an idi you wont have to worry much. But on a powerstroke for example we like to keep it below 1250. I've seen 1400 for up to 10 seconds before. Our pulling truck has hit 1800 but thats for just a matter of seconds.
 
Temp

braxton357 said:
Constant heat range... With studs and a good hg you can go far far past that for short periods with no ill-effects. fwiw. (as I'm sure you know)
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Head Gaskets have nothing to do with the direct affects of egts. The reason you do not want to see over 1250 degrees for an extended amount of time is to keep from melting the turbo.
 
Melting point of aluminum is around 1220 degrees, you do the math. Head studs and good gaskets allow for lots of internal engine pressure(ie;boost), not high temps. 1250 for long terms is when I'd start to get worried. I'm not saying no one has ever pushed it beyond that, but it ain't real smart.
 
braxton357 said:
Constant heat range... With studs and a good hg you can go far far past that for short periods with no ill-effects. fwiw. (as I'm sure you know)
Click to expand...

Relavent part bolded.

Cperry said:
pre turbo 1250 is what cummins says is max heat range
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Ive heard all kinds of stories.
"2000 pre turbo for 20 miles still driving today".... maybe dont know, wasn't there.

Factory recomendation may be a bit conservative, wouldn't be unheard of. But I doubt its ever gotten anyone in trouble.
 
I'm by no means an expert, but on a newer common rail cummins, a dead stock truck pulling lets say 6000 lbs will easily hit 1350 and i have seen as high as 1425 a few times dead stock in the mountains. Considering that is the factory tuning, i'm not gonna stress about it. The newer engines will definetly stand more heat than the 12 valves or the 24 valves would......

1250 is a good number to shoot for, but don't freak when a stock truck goes higher than that.
 
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