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Do I need to adjust carb for altitude?

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  • Do I need to adjust carb for altitude?

    Here in the Bayou State (Louisiana) we are 77 feet above sea level. We are planning on heading "way up Nort to dem Colorado Spring) this summer. Do I need to be concerned about carburetor adjustment when I reach the altitude of Colorado Springs?
    Laisez le bon temps roulez avec un Studebaker

  • #2
    You should probably at least adjust your idle speed upwards. It would not be a bad idea to adjust your mixture screws as well for smooth running. Maybe some of the local folks CO can chime in.
    Pat Dilling
    Olivehurst, CA
    Custom '53 Starlight aka STU COOL


    LS1 Engine Swap Journal: http://www.hotrodders.com/forum/jour...ournalid=33611

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    • #3
      Spent 8 years in Colorado........Smaller jets are required if You live there.
      sigpic
      1961 Hawk ...4-Speed;4bc;Twin Traction


      Ken Byrd
      Lewisville,NC

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      • #4
        Not going to live there. Just going to the International Meet and visit some family members who live there. So this questions deals more along the lines of any temporary fixes I may need to accomplish when I start going up in altitude.
        Laisez le bon temps roulez avec un Studebaker

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        • #5
          When we were in Colorado with the 51 we were up looking at Buffalo Bills burial spot I opened the air screws and retarded the timing a little bit and seems to run OK. DON'T use 85 octane in your Stude it don't like it.

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          • #6
            Do a search for the post entitled "R2 Carburetor altitude Adjustments". Lot's of comments and opinions. I'll repeat here Carter's rule of thumb for AFB's - Above an altitude of 4000 feet, reduce primary jet size by .001" for each additional 1000 feet. Therefore, for an altitude of 7000 feet, the primary jets would be reduced .003". This would be more easily accomplished with a step-up rod increase, if you can find one the yields a comparable reduction in mixture.

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            • #7

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              • #8
                Originally posted by mjeansonne View Post
                Here in the Bayou State (Louisiana) we are 77 feet above sea level. We are planning on heading "way up Nort to dem Colorado Spring) this summer. Do I need to be concerned about carburetor adjustment when I reach the altitude of Colorado Springs?
                Hey, maybe there will be a crew there to reset your timing and air/fuel mixture when you pick-up your registration package!?!? That certainly could explain why the registration fee being charged for the SDC 2013 Colorado Springs IM is the "highest" ever!!! see here: http://www.studebakerdriversclub.com/bod_20120228.asp and here: http://www.studebakerdriversclub.com/bod_20120514.asp
                Last edited by Welcome; 01-20-2013, 10:13 AM.

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                • #9
                  Yes, you can put in "fatter" metering rods. It takes about 30 seconds per side for an AFB. WCFB's are just about as easy. Strombergs......not so much.
                  They can tolerate a bit more timing at altitude.
                  You may need to turn in the idle adjustment screws a little. (there are no "air adjustment" screws as mentioned earlier)
                  You'll lose a bit of power at altitude, but on the bright side, octane requirements are lowered.
                  Last edited by bezhawk; 01-20-2013, 11:08 AM.
                  Bez Auto Alchemy
                  573-318-8948
                  http://bezautoalchemy.com


                  "Don't believe every internet quote" Abe Lincoln

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                  • #10
                    Went from Mich to Wyoming with my street rod.Adjusted idle stop. No problems. Ran a little rich, but we wern't there long enough to bother with.
                    B0b
                    Own \'53 Commander Starliner. Red w/beige top. 350 Chev/700R4. Tilt,cruise,A/C.http://i76.photobucket.com/albums/j30/Bobphyl/StudeontheBeach.jpg

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                    • #11
                      When I took my 52 to Estes Park back in the 80s all I had to do was open up the choke. It would barely run when cold in the morning with the choke closed.
                      sigpic

                      "In the heart of Arkansas."
                      Searcy, Arkansas
                      1952 Commander 2 door. Really fine 259.
                      1952 2R pickup

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