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FJR Motorcycle Forums
Technical & Mechanical Problems
AGirl's 07 ==> altitude sickness
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<blockquote data-quote="arefog" data-source="post: 244310" data-attributes="member: 3518"><p>Actually, octane requirements decrease with altitude. At our elevation of 5,000' near Denver regular gas is 85 octane and premium is 91, which works just fine since the lower atmospheric pressure results in less cylinder filling and thus a lower effective compression ratio. Turbo engines can be affected, however, and may experience timing retardation, boost bleed-off, or other means of protecting the engine. I am unaware of any relationship between octane and vaporization, and when vehicles are experiencing vapor lock around here I've never heard of anyone recommending a higher grade of gas as the answer. I'm certainly not saying as an absolute fact that it couldn't help, just that I've been driving in Colorado for 45 years and it has never come up.</p><p></p><p>Dick Fogg</p></blockquote><p></p>
[QUOTE="arefog, post: 244310, member: 3518"] Actually, octane requirements decrease with altitude. At our elevation of 5,000' near Denver regular gas is 85 octane and premium is 91, which works just fine since the lower atmospheric pressure results in less cylinder filling and thus a lower effective compression ratio. Turbo engines can be affected, however, and may experience timing retardation, boost bleed-off, or other means of protecting the engine. I am unaware of any relationship between octane and vaporization, and when vehicles are experiencing vapor lock around here I've never heard of anyone recommending a higher grade of gas as the answer. I'm certainly not saying as an absolute fact that it couldn't help, just that I've been driving in Colorado for 45 years and it has never come up. Dick Fogg [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
AGirl's 07 ==> altitude sickness
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