Stop popping w/higher octane - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 06-11-2011, 09:03 AM Thread Starter
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Stop popping w/higher octane

With all the recent threads and posts on exhaust popping, I offer my humble opinion ....use a higher octane!
The placard (see pic below) in my toolbox tells me to use 91 octane or higher. I can't buy 91 around here so I go with the 93. With proper adjustment of air mixture screws and higher octane, you can eliminate the popping. In my area, it costs me $0.90 more per tank full, but it's well worth it knowing I'm burning more efficiently.

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post #2 of 4 (permalink) Old 06-11-2011, 09:41 AM
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Originally Posted by VoIP Doc View Post
With all the recent threads and posts on exhaust popping, I offer my humble opinion ....use a higher octane!
The placard (see pic below) in my toolbox tells me to use 91 octane or higher. I can't buy 91 around here so I go with the 93. With proper adjustment of air mixture screws and higher octane, you can eliminate the popping. In my area, it costs me $0.90 more per tank full, but it's well worth it knowing I'm burning more efficiently.
You can use either 87 or 89 octane with no problems. The Ron number is higher than our octane ratings. Ron is about 4 to 5 points higher, ie 91 Ron equals 87 octane at our pumps.

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post #3 of 4 (permalink) Old 06-11-2011, 10:14 AM Thread Starter
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Ron is about 4 to 5 points higher, ie 91 Ron equals 87 octane at our pumps.
Did not know! Thanks
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post #4 of 4 (permalink) Old 06-11-2011, 12:40 PM
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For some more detail on that, North America uses the average of the RON and MON (the "(R+M)/2" you see in the fine print of the octane number on the pump) rather than the straight RON. It is also called AKI or PON. http://en.wikipedia.org/wiki/Octane_...mber_.28RON.29

Some people have reported poor running with higher octane that was fixed by going back to regular 87. Higher octane is actually harder to ignite, so it's generally most helpful if you go with a more aggressive tune which pre-ignites (ignition from something other than the spark plug, i.e. knock/detonation) with lower octane. In newer computer-controlled cars, the computer will actually switch to a less aggressive tune if it detects knock. If you see an improvement by switching to higher octane, it's because your car was detecting a problem (knock) and falling back to safer settings (less aggressive tune). The higher octane gets rid of the knock, so it can run the more aggressive tune.

Higher octane could very well stop the popping in the exhaust, as it would be harder for the remaining fuel to ignite there without a spark. Especially when coupled with adjusting your A/F mix, which could greatly affect the amount of leftover fuel that actually gets to the exhaust... I wouldn't necessarily say that your bike is running more efficiently, it's probably just not igniting the leftover fuel in the exhaust.


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