DEF performance claims

Discussion in 'Questions To Truckers From The General Public' started by Eleanor Weiss, Jan 5, 2022.

  1. Eleanor Weiss

    Eleanor Weiss Bobtail Member

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    How do chemical reactions taking place only in the exhaust system cause improved engine performance and lower maintenance?
     
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  3. Mike250rs

    Mike250rs Heavy Load Member

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    Raleigh, NC
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    They don't.

    They reduce a certain toxic chemical released in the exhaust and replace it with another toxic chemical being released.
     
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  4. Antinomian

    Antinomian Road Train Member

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    Who says it does?
     
  5. Eleanor Weiss

    Eleanor Weiss Bobtail Member

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    Over the years, I've heard that claim from a number of places. Things like lower maintenance, more time between oil changes.

    I wonder too ... do diesel locomotives use DEF?

    Eleanor Weiss
     
  6. Eleanor Weiss

    Eleanor Weiss Bobtail Member

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    :)

    Eleanor Weiss
     
  7. Eleanor Weiss

    Eleanor Weiss Bobtail Member

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    Here's one place the claims are made:

    https://www.discoverdef.com/def-overview/

    "SCR is a so-called "aftertreatment" technology,
    which means that it destroys harmful emissions
    after combustion. This gives manufacturers
    greater scope to tune engines to improve fuel
    efficiency and increase power. Owners of SCR
    vehicles enjoy greater reliability and longer oil
    change intervals, which add up to impressive
    operating cost savings over the life of the
    vehicle."


    Looking carefully, it seems the claims are not that the DEF itself improves things, but that if a manufacturer can depend on DEF being used, the manufacturer can alter the engine design to bring about the improvements.

    Apologies - apparently that's what I've heard from time to time and it didn't sink in.

    Eleanor Weiss
     
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  8. Mike250rs

    Mike250rs Heavy Load Member

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    Even that part is only a 1/2 truth.

    The "tuning" they are currently doing is to compensate for the other regulated emissions stuff that actually hurts performance and causes more pollution.
    The emissions stuff put on equates to trying to run a marathon while wearing a plastic bag over your head.
     
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  9. Snoopycda

    Snoopycda Medium Load Member

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    If you change the DEF system to a water methanol injection system on the intake side, it will definitely increase power.
     
  10. RockinChair

    RockinChair Road Train Member

    They don't. They tune for minimum emissions.



    Yeah, if you don't count all the downtime from having to replace bad components like DEF quality sensors and dosers, and having to pull and bake the DPF.
     
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  11. Eleanor Weiss

    Eleanor Weiss Bobtail Member

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    So, does anyone know if diesel locomotives are required to use DEF? Or diesel farm equipment? Or diesel boats?

    Eleanor Weiss
     
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