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High altitude engine adjustments

Discussion in 'Early CJ5 and CJ6 Tech' started by Project71-5, Mar 20, 2006.

  1. Mar 20, 2006
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Since I'm moving to CO from Ohio the elevation goes from about 1000' to about 7500 where I'm living. I'll be going as high as 12000 also. What kind of adjustments are needed for the elevation gain? Right now I'm planning on trying to find some #49 jets and changing to them just before I start the climb into the mountains. Anything else I should be aware of?
     
    Project71-5, Mar 20, 2006
    #1
  2. Mar 20, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    lafester had some info on where to get the jets
    he and I both said we were going to get some
    I didn't follow thru.
    the only other thing I can think of would be to bump the timing up a few degrees as well
     
    jpflat2a, Mar 20, 2006
    #2
  3. Mar 20, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
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    8,524
    jpflat2a, Mar 20, 2006
    #3
  4. Mar 21, 2006
    panzer

    panzer Super Mod Staff Member

    Columbus, OH
    Joined:
    Dec 9, 2003
    Messages:
    1,245
    panzer, Mar 21, 2006
    #4
  5. Mar 21, 2006
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,470
    Smaller Jets and a little lift on the float - I go from 6700 to 13K with it set that way with no issues. Just kept timing at stock as well.
     
    Warloch, Mar 21, 2006
    #5
  6. Mar 21, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
    Messages:
    23,596
    Interesting. I always thought that the float level only made a difference in the mixture, ie the same as a fine adjustment of the jet size. Must be something else going on too wrt altitude.
     
    timgr, Mar 21, 2006
    #6
  7. Mar 21, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
    I recall a discussion some years back (not sure if it was here) that higher octane fuel (=slower burning) also helps at altitude.
     
    lynn, Mar 21, 2006
    #7
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