EGT danger zone?
Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
1200-1250 max for extended times. Everything you can dish out for short burst of a couple seconds. You're mostly worried about heat soak. A short burst to 1600 isn't going to kill your truck.
Elder User
Joined: Dec 2002
Posts: 797
Likes: 1
From: UT
That's a loaded question! Alot of variables...
Is your EGT probe in the downpipe or manifold?
Coated or Uncoated pistons?
Aluminum or Steel pistons?
Aluminum melts at 1220* but can vary depending on how its blended!
Is your EGT probe in the downpipe or manifold?
Coated or Uncoated pistons?
Aluminum or Steel pistons?
Aluminum melts at 1220* but can vary depending on how its blended!
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I wouldn't "ride the guardrail". There can be an inaccuracy in the gauge, the probe might be deeper or shallower than it should, you're not seeing the other manifold (which can be different by 50 degrees quite easily). I would downshift/slow down to keep the EGTs below 1200... but that's me being cautious to prevent something worse than not getting where I'm going sooner.
If you're going to push it, I would get another EGT gauge. To walk the talk... I did.
If you're going to push it, I would get another EGT gauge. To walk the talk... I did.
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
According to International, the limit is sustained temperature above 1250* when measured in the manifold. Short bursts above that won't harm anything.
Down pipe measurements are inaccurate.
Manifold to manifold temperatures tend to stay within 50* of each other unless you have a failure on one side resulting in abnormally low on the effected side.
Down pipe measurements are inaccurate.
Manifold to manifold temperatures tend to stay within 50* of each other unless you have a failure on one side resulting in abnormally low on the effected side.
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Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
I've run around 1200-1250 degrees for 20 minutes at time with no ill effects (long extended incline between Tucson and El Paso...)
I've also seen temps in the 1350-1400 range while pulling 6-7% grades at 25k lbs gross for short periods (2-3 minutes) and that hasn't caused any problems either.
Been doing this for the last 10 years or so....
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