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« on: July 24, 2023, 09:50:12 AM »
I've felt the loss of power in a modest vehicle at 9500 feet altitude in Colorado. There are suggestions of losing 3% of power per 1000 feet of altitude gain, also that engines can run on lower octane fuel in higher altitudes than elsewhere. In certain parts of Colorado fuel stations have sold petrol with octane levels as low as 85.
I guess the impact of altude is felt more on lowly poweredengines. Presumably manufacturers set engines up to run optimally at some average altitude above sea level. No idea whether it varies by manufacturer or intended market. Tibet might be require some adjustments with the lowest city over 9000 feet and an average altitude over 14000 feet. Probably not many 400 fours there though.
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