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Trucks [ Eighteen Wheelers ] Roll On Big Mama. Forum/Discussion about Eighteen Wheeler Trucks. What truck do you like or dislike? Is your favorite truck a Mack, Peterbilt, Kenworth, Marmon, Volvo or Freightliner? Which diesel engine do you prefer; Detroit Diesel, Cummins, or...

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Old 09.15.2008
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Pyrometer for C15 single turbo MBN; How hot is too hot?
My truck does not have a pyrometer; I purchased one, and will install it tomorrow. Want to track exhaust temps as I start mods to the engine.

The one I purchased is digital, which has a high temp alarm; the readout will begin flashing when a preset temp is reached.
Just wondering what would be a good number to set it at?
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Old 09.15.2008
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anything above 1300 is...well, not safe. Try to keep it under that.
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Old 09.16.2008
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It would be best to keep it below 1100 deg for longer turbo housing life. As you start to log in to a high, down shifting to get rpns a little higer will keep the egt down. You will see high egt with that mbn, after mods it will drop. Mount the probe behind the turbo, keep it about 6 to 8 inches from the hot wheel.
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Old 09.16.2008
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I noticed that the N14 525 HP Cummins TOT would soar when I started pulling a hill, I would have to release the cruise and back down the power to keep the TOT from climbing. I would always reduce power to keep the TOT below 1000 degrees. After the heads on the engine were changed the TOT became less of an issue. Most of the newer engines will not over temp TOT, but I've seen idiots melt pistons out of Cummins engines because they failed to pay attention.
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Old 09.16.2008
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You will probably see it as high as 1150*F, if you got the mufflers in place, in the high elevations climbing hills..... Thats how hot mine got, a friends runs 1200*F all the time, its safe up to there, anything over 1200* is playing with fire.
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Old 09.17.2008
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After installing pyrometer, took my first trip today, 541 mi. Left Lake Charles, LA drove to New Orleans, loaded (gross wt. = 75,480), returned to Lake Charles. Flat ground except for three high rise bridges which cause my speed to drop from 65 mph to around 35 mph. Hottest temperature reached was 894 degrees F., and that was really gouging on it while bridge climbing. So much for setting the high level alarm at 1100 degrees.
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Old 09.19.2008
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That sounds like something is wrong, a buddies bridge motor runs that hot empty
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Old 09.19.2008
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Quote:
Originally Posted by 24valve puller View Post
That sounds like something is wrong, a buddies bridge motor runs that hot empty
Shortly after buying that truck, (last April), the yellow "check engine" light would come on momentarily when climbing a high rise bridge, or sometimes even an overpass. It doesn't stay on long enough to throw a code, and although it has begun to light up more frequently, still momentarily, still no code. That may have something to do with the "no power" ailment, as it is weak even for an MBN motor. After I began working the truck, I first suspected it was derated to a 435, or even less, but according to the 'puter, it's supposed to be 475. Mechanics suspect either turbo sensor, or some atmospheric sensor, and advised that faulty sensor would eventually just quit, then show a code, whereas I could replace it, but the damn thing won't die.
Guess I just need to start replacing parts.
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Old 09.19.2008
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Does your fuel mileage suck? If so, a rich air/fuel ratio will make your EGT's go down. Lean = higher.
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Old 09.19.2008
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Quote:
Originally Posted by ramdaspadhye View Post
Does your fuel mileage suck? If so, a rich air/fuel ratio will make your EGT's go down. Lean = higher.
I thought more fuel EGTs go higher....?
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