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Discussion in 'Intermediate CJ-5/6/7/8' started by PR66, Apr 25, 2008.

  1. Apr 25, 2008
    PR66

    PR66 New Member

    Joined:
    Oct 4, 2007
    Messages:
    31
    Ok, this may sound like a silly question but here it goes. What is the maxium speed a 1978 CJ5 258 engine can run (all stock) without over stressing the engine. I want to attend a show but have to go highway.
     
    PR66, Apr 25, 2008
    #1
  2. Apr 25, 2008
    High5

    High5 Member

    Urbandale, IA
    Joined:
    Jan 13, 2005
    Messages:
    802
    Unless you have changed the differential gears out to something much lower, you should have no problems maintaining highway speeds without "stressing" the engine too bad.

    With mine, I probably run around 3 grand at 55-60 in fourth gear.

    I used to run mine at 70-80 on the interstate in it's current form except the EFI without any problems.

    High5
     
    High5, Apr 25, 2008
    #2
  3. Apr 25, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    I've run mine with a 232 at 70mph several times. It didn't sound like it was hurting any, but it sure kills fuel mileage.
     
    NorCoJeeper, Apr 25, 2008
    #3
  4. Apr 25, 2008
    73cj5

    73cj5 Member

    Maine
    Joined:
    Jan 15, 2004
    Messages:
    905
    I wouldn't run it faster then 3500 rpm for any extend periods of time. With that said i used to run mine at 3200 for 5 hours at a time, other than getting 10MPG it was fine(around 78mph). The owners manual says the engine will consume more oil at speeds above 65mph so just check the oil a little more often.
     
    Last edited: Apr 25, 2008
    73cj5, Apr 25, 2008
    #4
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