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High Altitude Driving

Last post 07-10-2009, 7:47 AM by Agil. 3 replies.
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  •  06-13-2009, 11:05 PM 19817

    High Altitude Driving

    Just a quick question on changes to carb settings for driving to higher altitudes.  Driving to MG 2009 next week and was thinking when arriving in Colorado maybe just a bit of leaning the carbs down might be required for good performance in the higher altitudes.  Am I correct and I suppose checking the plugs for color is the best way to tell how lean to go?
  •  06-15-2009, 9:01 PM 19854 in reply to 19817

    Re: High Altitude Driving

    It will go rich at high altitude and will appreciate being leaned out.  Tuning instructions are always the same, regardless.  Turn more lean until it starts to shake.  Go slowly back more rich until the shake goes away.  Go two flats (1/3 turn) more rich, and you're done. If you want to fine tune from there it's on to the lift-the-button technique.

    When I run my MGA up Pikes Peak from 8,500 to 14,110 feet, it runs well about two full turns more lean than at sea level.  Bear in mind you have much less air up there, so expect it to run like low compression and half throttle.  Catch a lower gear if needed going up hills.

     

  •  07-02-2009, 8:42 PM 20045 in reply to 19854

    Re: High Altitude Driving

    Thanks for the info and suggestions.  Had to turn it up about 7 flats to lean it down for the climb up Lookout Mountain and over Loveland Pass.  Still didn't like the altitude much, but at least it did run.  As the altitude deceased on the way down and towards home took the 7 flats out and it was back to normal running. 

    Thanks again.

  •  07-10-2009, 7:47 AM 20146 in reply to 20045

    Re: High Altitude Driving

    Hi, also when someone go to a higher level over sea level can advance few degrees in the ignition timing

     

    Regards