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Everything Dirt Bike
General Dirt Bike
Fuel what do you do?
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<blockquote data-quote="HeadTrauma" data-source="post: 11395" data-attributes="member: 83"><p>You're wrong. <img src="https://www.dirtbikeaddicts.com/static/images/smilies/devil.gif" class="smilie" loading="lazy" alt=":devil:" title="Devil :devil:" data-shortname=":devil:" /></p><p></p><p>My XR600 has 9.7:1 compression and it <strong>requires</strong> at least 91 octane while other engines have 12+:1 and only need 87. I got my 9:1 Mustang to ping on 87 a few times too. Steeper rear end gears helped a bit(food for thought). Compression ratio is only one of the many factors that determine an engine's octane requirements. Overall it is dictated by the design and application. Highly oxygenated gasolines are the only ones that produce more power in engines that are not already octane-limited because more fuel can be burned per combustion cycle. Octane is a like many things in life; the right amount is perfect, but too little is bad and too much isn't beneficial either. As an aside, it is also independent of a fuel's burn speed, flame temperature, and energy content. <img src="https://www.dirtbikeaddicts.com/static/images/smilies/prof.gif" class="smilie" loading="lazy" alt=":prof:" title="Professor :prof:" data-shortname=":prof:" /></p></blockquote><p></p>
[QUOTE="HeadTrauma, post: 11395, member: 83"] You're wrong. :devil: My XR600 has 9.7:1 compression and it [B]requires[/B] at least 91 octane while other engines have 12+:1 and only need 87. I got my 9:1 Mustang to ping on 87 a few times too. Steeper rear end gears helped a bit(food for thought). Compression ratio is only one of the many factors that determine an engine's octane requirements. Overall it is dictated by the design and application. Highly oxygenated gasolines are the only ones that produce more power in engines that are not already octane-limited because more fuel can be burned per combustion cycle. Octane is a like many things in life; the right amount is perfect, but too little is bad and too much isn't beneficial either. As an aside, it is also independent of a fuel's burn speed, flame temperature, and energy content. :prof: [/QUOTE]
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Fuel what do you do?
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