Don Del Posted June 17, 2009 Share Posted June 17, 2009 I own a Defender Puma which I purchased new in Chile in June of last year. On a trip to La Paz in Bolivia earlier this year there was a noticeable reduction in power and some evidence of exhaust smoke while crossing the Altiplano at 4000m plus but otherwise the engine ran well. The day after arrival in La Paz at around 3600m with the engine cold it smoked heavily from the exhaust on start up with a marked reduction in power, both symptoms improving as the engine reached normal operating temperature. Any observations or suggestions with regard to alterations or modifications that should be made for high altitude operation would be appreciated. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted June 17, 2009 Share Posted June 17, 2009 To be honest I doubt whether there are any real improvements for this - the engine tune probably compensates for altitude as best it can and at the end of the day, less air = less power and 4000m is a long way up! It would be worth checking the obvious i.e. air filter clean, no restrictions in the intake and that the AFM is working properly. Quote Link to comment Share on other sites More sharing options...
sgnas Posted June 18, 2009 Share Posted June 18, 2009 Have you tried working hard at 4000m, it is seriously difficult! Height sudddenly makes a massive difference to the amount of air around 2000m ~ 80% of sea level 3000m ~ 71% of sea level 4000m ~ 62% of sea level Quote Link to comment Share on other sites More sharing options...
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