X-15 Cummins thread

Discussion in 'Peterbilt Forum' started by KB3MMX, Feb 26, 2018.

  1. fuel concierge

    fuel concierge Bobtail Member

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    Dec 18, 2020
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    16087387136388839323653025917418.jpg 16087387136388839323653025917418.jpg 16087387136388839323653025917418.jpg
     

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  3. TheFonz

    TheFonz Bobtail Member

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    Turns out all the squeeze clamps coming off that metal line were weak
     
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  4. AKDoug

    AKDoug Medium Load Member

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    Ran the overhead on my new X-15 at 3000 miles.. #6 exhaust was .020".. .002" too tight for tight spec. That was the only one that was off.
     
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  5. magoo68

    magoo68 Road Train Member

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    st malo mb canada
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    Old school still works . This run it till warranty is off before setting valves don’t work.
     
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  6. AKDoug

    AKDoug Medium Load Member

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    It was so easy to check on this truck that we'll be doing it annually. Also gives us a good chance to visually check the cam wear.
     
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  7. Cowboycattlac

    Cowboycattlac Bobtail Member

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    The efficiency series has 18:1 compression and tendency to lift the head. Performance series has 16:1 compression
     
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  8. Rodeo_Joe

    Rodeo_Joe Light Load Member

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    Blackstock, Ontario
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    You cant down speed the motor that low. Shouldn't go below 1200. Motor cant stand the down speeding that low.

     
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  9. KB3MMX

    KB3MMX Road Train Member

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    I believe that after having the performance version, it didn't like being below 1400.

    Unfortunately Cummins is trying to keep up with Detroit and Mack/Volvo and the X15 Doesn't seem to be built strong enough in the bottom end to handle downspeed Big TQ at low RPMs.

    They advertise peak TQ at 1000 rpm on X15-E-500/1850
     
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  10. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    That's pretty low. Peak tourqe on my ISX is 1250. And it would just run terribly there.

    1325 to 1400 it's very happy.
     
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  11. Masonry

    Masonry Bobtail Member

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    Oct 11, 2020
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