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Dyno question....

Discussion in 'Ask An Owner Operator' started by buddyvuk, May 17, 2013.

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  1. May 17, 2013 #1
    buddyvuk

    buddyvuk Medium Load Member

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    Jan 6, 2013
    portland oregon
    0
    so got my dyno report today ....truck was set at 470 and it peeked at 400 ...3.3 blow by??? is that something i should worry about?

    2003 freight century 12.7 l ..13 speed 816k miles


    what do you guys think? its def more than 80%
     

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    buddyvuk, May 17, 2013
    buddyvuk, May 17, 2013
    #1
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  3. May 17, 2013 #2
    dhooks

    dhooks Light Load Member

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    Jun 25, 2012
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    Its ok, its an 800k engine and your blo by reflcts that but its still acceptable
     
    dhooks, May 17, 2013
    dhooks, May 17, 2013
    #2
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  4. May 17, 2013 #3
    SHC

    SHC Spoiled Rotten Brat O/O

    8,484
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    Feb 26, 2011
    Westville, IN
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    At least you now know your peak HP is from 55-58mph
     
    SHC, May 17, 2013
    SHC, May 17, 2013
    #3
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  5. May 17, 2013 #4
    05 FreightShaker

    05 FreightShaker Light Load Member

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    Jan 20, 2013
    Houston
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    That seems about normal you have at least 80% of your horsepower going to your wheels so thats a good start...but with that amount of miles I would change that bull gear just to be safe... Detroit recommends having it changed out every 750,000mi...
     
    05 FreightShaker, May 17, 2013
    05 FreightShaker, May 17, 2013
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  7. May 17, 2013 #5
    MNdriver

    MNdriver Road Train Member

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    What rear ends again?
     
    MNdriver, May 17, 2013
    MNdriver, May 17, 2013
    #5
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  8. May 17, 2013 #6
    buddyvuk

    buddyvuk Medium Load Member

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    Jan 6, 2013
    portland oregon
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    3:58 rear ends
     
    buddyvuk, May 17, 2013
    buddyvuk, May 17, 2013
    #6
  9. May 17, 2013 #7
    VisionLogistics

    VisionLogistics Road Train Member

    1,551
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    Dec 8, 2011
    Jellystone
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    3.3 inches (in H2O) is normal. I recall the last shop on my dyno run were saying that when you get up around 10-15 inches is when it's time for a rebuild.
     
    VisionLogistics, May 17, 2013
    VisionLogistics, May 17, 2013
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  10. May 17, 2013 #8
    MNdriver

    MNdriver Road Train Member

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    If they did the run correctly, you will see the does because they ran it in 7 direct. True 1:1 out of the Trans. Direct gearing.

    Everything else looks good to me.
     
    MNdriver, May 17, 2013
    MNdriver, May 17, 2013
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  11. May 18, 2013 #9
    buddyvuk

    buddyvuk Medium Load Member

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    Jan 6, 2013
    portland oregon
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    I am not understanding your post?? What do you mean??
     
    buddyvuk, May 18, 2013
    buddyvuk, May 18, 2013
    #9
  12. May 18, 2013 #10
    MNdriver

    MNdriver Road Train Member

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    You peak is from 1300 -1700rpm when you read the sheet. Mean at 65 mph, you'll be in 13 @ about 1375-1400 rpm.
     
    MNdriver, May 18, 2013
    MNdriver, May 18, 2013
    #10
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