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How strong is a typical 12.7 detroit engine brake?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by double yellow, Apr 14, 2015.

Page 2 of 2
  1. Apr 15, 2015 #11
    double yellow

    double yellow Road Train Member

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    I'm kinda leary of butt dyno results, but it feels like there is less response at low rpm (1050-1200). Once boost builds it feels like the power is comparable.

    I haven't filled yet, but going by scangauge I got 8.9mpg in the last 1400 miles. 1/2 of that was at 45,000 lb, 1/2 at 63,000 lb. 30' to 3700' to 2300' to 4300' to 30' and back... That is in line with expected mpg, though perhaps a skoosh low. I'll have a better idea after a month
     
    double yellow, Apr 15, 2015
    double yellow, Apr 15, 2015
    #11
    icsheeple Thanks this.
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  3. Apr 15, 2015 #12
    fortycalglock

    fortycalglock Road Train Member

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    The first hose I check is the one from the compressor to the intake.
     
    fortycalglock, Apr 15, 2015
    fortycalglock, Apr 15, 2015
    #12
    double yellow Thanks this.
  4. Apr 15, 2015 #13
    062

    062 Road Train Member

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    If you had overhead run when you put the jakes on, that could be your mpg drop. Mine will drop 2-3 tenths after a overhead.
     
    062, Apr 15, 2015
    062, Apr 15, 2015
    #13
    double yellow Thanks this.
  5. Apr 15, 2015 #14
    haycarter

    haycarter Road Train Member

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    I've got some graphs/tables Somewhere (that I can't find at the Moment) that Give the BHP produced by "jakes" on various Engines..
    From memory the Series 60 produces (regardless of HP rating) 350Hp of Braking effort.
    & the ISX/signature (Regardless of Hp setting) produces 600Hp of braking effect.. BISTBC..
     
    haycarter, Apr 15, 2015
    haycarter, Apr 15, 2015
    #14
  7. Apr 15, 2015 #15
    Cetane+

    Cetane+ Road Train Member

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    the ones made by "Jake", work better than the other makes. You might have gotten better holding power out of an actual Jake brake.
     
    Cetane+, Apr 15, 2015
    Cetane+, Apr 15, 2015
    #15
  8. Apr 16, 2015 #16
    double yellow

    double yellow Road Train Member

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    Perhaps.

    Unfortunately, I could not get a Jacobs for my 2000 mk 12.7. It was an oddball model & year, the folks at Jacobs were more interested in their newer applications to be of any help, and ultimately no one stocked the necessary parts except pacbrake.

    Anyway, it seems 2100rpm is the upper limit, not 1800 (an extra 17%), which, when combined with 29% more boost, ought to give me nearly 50% more braking power -- an amount more than satisfactory (especially having come from no engine brake at all).
     
    double yellow, Apr 16, 2015
    double yellow, Apr 16, 2015
    #16
    icsheeple Thanks this.
  9. Apr 16, 2015 #17
    Cetane+

    Cetane+ Road Train Member

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    The compression brakes always work better at higher RPMs. Well tell us how it does on your next trip. Good luck keeping it cool (the brakes).
     
    Cetane+, Apr 16, 2015
    Cetane+, Apr 16, 2015
    #17
  10. Apr 16, 2015 #18
    icsheeple

    icsheeple Trailing the Herd

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    I see what you did there. Lol. Stay frosty...
     
    icsheeple, Apr 16, 2015
    icsheeple, Apr 16, 2015
    #18
  11. Mar 14, 2024 #19
    Phantom307

    Phantom307 Light Load Member

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    I am 9 years late to this party. How dare they leave me on a cliff hanger like this! Did he survive!? What happens when you take the 60 series to 2100 rpms on a jake brake???
     
    Phantom307, Mar 14, 2024
    Phantom307, Mar 14, 2024
    #19
  12. Mar 14, 2024 #20
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Lots of things could happen. If your Jakes are working properly, and you take RPM's to 2100, and then turn your Jake switch on, and THEN let off the throttle?

    What will happen then?




    Your Jakes come on
     
    Big Road Skateboard, Mar 14, 2024
    Big Road Skateboard, Mar 14, 2024
    #20
    Sons Hero Thanks this.
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