Pyrometer temperature

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by scoobertdoo, Jan 14, 2021.

  1. scoobertdoo

    scoobertdoo Light Load Member

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    Getting ready to install a pyro post turbo, and wanted to know what the upper temperature range would be? I had some parts fall off, and I was told to monitor the egts and not go over 900 for good turbo life. I wanted to make sure this was 900 post turbo. Last gauge I had was 1250, but was in the manifold. Thanks
     
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  3. lester

    lester Road Train Member

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    What engine?? Not that it matters much, but sure would be helpful
     
  4. scoobertdoo

    scoobertdoo Light Load Member

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  5. Brettj3876

    Brettj3876 Road Train Member

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    1000ish somewhere in there. One of our trucks says 1025 and the other 1100 on the dash. I prefer 950 max just to be safe on a long pull
     
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  6. Brettj3876

    Brettj3876 Road Train Member

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    Easiest way to keep EGT's in check is to not lug the engine. Pulling down to 1100-1200 now will heat it up a lot more than before the parts falling off.

    Edit: don't know the characteristics of the mx but I wouldn't lug it below 1350-1400 now for any length of time. Don't worry about a few extra rpm you'll be getting better mpg with the delete anyways and it's easier on everything not lugging it pounding the #### out of it all the time. I'd sacrifice a few tenths mpg any day to increase longevity.
     
    Last edited: Jan 14, 2021
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  7. RockinChair

    RockinChair Road Train Member

    I was told that 900° is perfectly safe for just about any diesel engine, but that piston tops will start to anneal (soften) at 1300°. All of these are pre-turbo numbers.
     
  8. Brettj3876

    Brettj3876 Road Train Member

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    Aluminum melts around 1221° your Pistons are steel tops and 1300 deg there won't hurt them that equals around 1000 post turbo. Every factory engine will get hotter than 600 so that 900 pre turbo is bs number. He meant post turbo 900 is nothing to worry about

    Difference in pre and post turbo is about 250-300°
     
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  9. KB3MMX

    KB3MMX Road Train Member

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    1250 manifold (most accurate) , 1000F post turbo(less accurate measurement method)

    The aluminum piston crowns(depending on motor) will start to melt before the iconel turbine in the turbo.... It's not for turbo health, they'll withstand 1500+

    Motors with Steel crowns have a first weak point of compression rings losing tension from repeated high egt(1400+ on those motors), injector nozzle coking, then the exhaust valves , then turbo.
     
  10. Dave1837

    Dave1837 Medium Load Member

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    My MX13 will pull a hill in 18th gear at 1000 RPMs happily. I found a Paccar DVD in my truck and watched it one night, it said that 1k-1,400 is the ideal rpm for pulling. I agree with it 100%! If I run it over 15 it feels like there's no power at all, but once it hits that 14 mark it starts pulling like there's no tomorrow. Weirdest engine I've ever operated.

    On the flip side, the engine brake is useless below 15.
     
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  11. Brettj3876

    Brettj3876 Road Train Member

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    What's the oil psi run at 1100. Always wondered what these new low rpm touted engines run at for oil psi at low rpms. Is it like the old maxidynes running 80-90 psi? I'd be skeptical of running that below 1250-1300 after a delete. It's gonna be putting out some more power with higher combustion pressures after the delete. More air going in instead of burnt egr. Whole diff animal compared to a non delete mx. You're stressing the bottom end even more with higher cyl pressure with the delete. Lugging it now after the "tune up" I wouldn't recommend. It's going to produce more heat to
     
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