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Thread: injector rattle

  1. #1

    injector rattle

    I want to begin to tune out injector rattle. My truck seems to have it all the time unless im under heavy acceleration. Befor I begin pulling timing out of my main tables, I was wondering if I have to much pilot? when cruising I saw 24 degrees pilot and 4 degrees of main. That's 1500 rpms, 3lbs of boost, 14.9k rail and a pw of 405us (I took a snap shot)
    I will post a log later
    any thoughts?

  2. #2
    Need info on truck and mods.
    2004.5 Cummins.
    Borgwarner 13009097047 s300sxe 63-73 compressor 63/80 super core turbine housing 80mm .83 A/R Twin Scroll Housing,
    50HP BMS/Exergy Injectors
    BD T4 manifold,
    BD CAI,
    5" turbo back exhaust,
    turbosmart ext wastegate,
    BD lift pump with 2 mic filter and h2o separator,
    banks intercooler, Banks intake horn,
    slightly built tranny.......

  3. #3
    05 six speed all stock

  4. #4
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    Your pilot timing is fine. You shouldn?t have any so called injector rattle with those values. But, don?t have the entire picture being painted here either.

  5. #5
    Jim, its possible I don't really know what "injector rattle" sounds like. I have a diesel rattle type sound under light load/cruise that when I get aggressive it smooths right out. I just assumed it was injector rattle
    I took a small log to look at

    injectorrattle.hpl
    05 qclb nv5600
    stock

  6. #6
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    What people refer to as injector rattle is the combustion event happening much to soon in the compression stroke, like pre-detonation in a gas engine. Clacky/pinging type sound, think of old mechanical injection diesel engines sound but a much louder/sharper knock. Unless you have greatly increased pilot injection volume, the numbers you stated shouldn?t give you knock beyond normal for your model year.
    Last edited by Jim P; 07-06-2020 at 11:45 AM.

  7. #7
    I can log pilot injection volume and post that up later
    thanks for the help
    05 qclb nv5600
    stock