What is high EGT's - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 02-03-2013, 09:09 PM Thread Starter
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What is high EGT's

In the time I have been here I have heard many say they have problems with high exhaust gas temperature's. Well I made a little trip to pick up some stuff I bought today and watched my temp's, and thought about what others have said, well the egt's don't go up until you make the truck work and if you have the fuel balanced to the air (turbo) things are fine. The greater the power output level brings up the problem of lag with a older turbo. But unless we make heat we will not get power. Think about it like this fuel, air, and compression make the fire that run's these engines, and a cool egt means we are not making the air that drives the pistons push very hard, the higher the egt the greater the push but if we get too hot for too long there will be problems.
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post #2 of 3 (permalink) Old 02-03-2013, 10:36 PM
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I get the feeling you are asking a retorical question. For the benefit of any one who doesn't know, my take on this is anything over 1200 degrees for more than a few seconds is doing damage to valves or pistons, or both. I understand pulling a long grade of 6% or more will require dropping a few gears along the way as the egt rises.If you know your truck, you will know when to drop a gear. Back when a C180 or an NHC 220 was king of the hill , so to speak, a pyrometer was absolutely necessary if the fuel was cranked up .I'm sure someelse will depose me, but this has worked for me a lot of years. Now I return you to the regular programing.
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post #3 of 3 (permalink) Old 02-07-2013, 02:41 AM Thread Starter
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You are correct, sometimes people just get too big of injectors, but most of the time they just don't realize that the egts are just a indication of the engine working, keep it within the limits and the problems will be minimal. It is not uncommon to see a turbo charged gas engine hitting 1750, but that is another story.
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