Rpm sweet spot for Mack motors

Discussion in 'Mack Forum' started by Ruthless, Nov 27, 2014.

  1. Ruthless

    Ruthless Road Train Member

    8,294
    80,473
    Aug 28, 2010
    The City.
    0
    Where do they like to run? I been looking at getting a daycab, and with rare exceptions what I see for Mack's all the rears are 4.++ 4.42, 4.56 etc. Mileage is consistent with other daycabs that run highway speeds....making me wonder are they running at 65mph they'd be wound out pretty good...I've never ran or even been in a Mack newer than late 60's and never on the highway. Just asking for curiousity
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. mitrucker

    mitrucker Road Train Member

    4,844
    7,713
    Dec 15, 2010
    Lapeer, MI
    0
    Run a 2015 daycab with an auto trans. At 65 its a little over 1400.
     
  4. x#1

    x#1 Road Train Member

    1,773
    1,102
    Dec 24, 2009
    Cherokee County, Alabama
    0
    i got a buddy that drives a day cab mack pulling logs and sticks and it is a new one with the 505 in it and he says it pulls as good as the 550 cat he just got out of that was a 2007.
     
  5. Ezrider_48501

    Ezrider_48501 Road Train Member

    3,845
    5,123
    Apr 2, 2011
    bismarck, nd
    0
    my e-7 seems to like `1600 for a cruse rpm witch is 70 with 3.70's
     
    Ruthless Thanks this.
  6. Redtwin

    Redtwin Road Train Member

    5,322
    7,119
    Aug 17, 2012
    PBC, FL
    0
  7. Mack427

    Mack427 Medium Load Member

    323
    92
    Jan 22, 2009
    0
    all depends what Mack motor and trans. a maxidyne with a t2070 would run 5.55-6.34 depending on what your road speed needed . my E7 gets the best fuel mileage 1450-1500 which is 65-70mph doubt it would do much better I slowed down dragging what I do and I can't stand driving below the speed limit on a good day. the older e6's seemed to get good fuel milage running 1800 or better
     
    Ruthless Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.