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Old 09-04-2014, 05:14 AM   #1
BikeMan OP
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octane question

does 11.3:1 C.R. equal 91-94 R+M/2 octane ?
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Old 09-04-2014, 06:09 AM   #2
GrahamD
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Quote:
Originally Posted by BikeMan View Post
does 11.3:1 C.R. equal 91-94 R+M/2 octane ?
Depends on how the head is designed and fueling and ignition etc etc.
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Old 09-04-2014, 06:32 AM   #3
greywolf
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The Mazda SKYACTIV-G engine runs 87 octane with a 13:1 compression ratio. http://www.motoiq.com/MagazineArticl...echnology.aspx

An old fashioned air cooled, two valve per cylinder engine running a race tuned cam may require premium with a 9.5:1 compression ratio.

There is much more to octane requirement than CR.
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Old 09-08-2014, 07:02 AM   #4
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pure stock conventional 2 valve air cooled motors never have more than 10.0:1 C.R.. and require prem. 91-94 octane.
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Old 09-08-2014, 04:42 PM   #5
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does 11.3:1 C.R. equal 91-94 R+M/2 octane ?
My 2013 Vstorm 650 has similar compression numbers and runs fine on regular. That is what is recommended by the manufacturer.

You should be able to check on what the bike manufacturer recommends, but I would agree that on a lot of engines those numbers would require premium fuel.
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Old 09-08-2014, 06:35 PM   #6
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That is what is recommended by the manufacturer..
i also have v-strom. i think your talking about the owner's manual. the shop manual calls for "at least 87 R+M/2 or higher."
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