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skunkhome
USA
12827 Posts |
 Posted - 10/15/2011 : 01:07:09
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| As you all know I purchased a used Honda scooter w/o a manual last week and have been trying to determine what gas I should be using. I had heard somewhere that they used premium so that is what I have been using. Tonight I found a data tag that said that the fuel requirement was 91 RON. I have been using 93 PON (Pump Octane Number) which is an average of the RON (research octane number) and MON (motor octane number). The MON is typically 8-10 points less than the RON for the same fuel. PON is calculated as (R+M)/2 or thus says the pump. If so I am figuring that PON is 4-5 points below RON. So 91 RON should equal 86-87 PON. Should I be using regular unleaded 87 PON? BTW: the engine compression ratio is 9.3:1. |
  Phil
"They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty."
Benjamin Franklin |
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Talntedmrgreen
USA
4110 Posts |
Posted - 10/15/2011 : 07:22:28
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I run regular in everything modern that doesnt tell me otherwise. If there is a need for it, it should tell you....I also have never seen anything that lists the RON in the manual or on the equipment. You have me wondering now, and Im going to give our Honda engine in the barn a good look to see if that mentions a RON requirement.
There isnt much out there these days that requires premium....even the 2-stroke performance engines in atv's, watercraft and sleds (those that remain 2-stroke) have moved away from higher octane fuels, and those are dealing with some high compressions. I would be interested to find out more on your machine....I havent even seen pics floating around! |
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Talntedmrgreen
USA
4110 Posts |
Posted - 10/15/2011 : 07:30:57
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Phil, I was peeking online at 'Honda Scooters' and found the Ruckus, which appears to be a small, single.person.scooter, but with a high compression engine (12:1). That scooter claims to require 'regular' gas. Also, I really do think the manufactuere, especially if you have an engine warranty, would list the higher octane fuel requirement if there was a threat of detonation.
Im guessing the lil bugger would spark knock like crazy on 87 or 89 if it wasnt supposed to be there.... |
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oldsarge
USA
688 Posts |
Posted - 10/15/2011 : 10:32:03
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| I think most hi-octane requirements were to avoid knock with the advanced timing required for high performance engines.Most cars,trucks now have detectors which automtically retard the timing when pre-detonation occurs.Every thing is becoming so sophisticated,I can't imagine what they're putting in itty bitty riceburners.$.02 |
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skunkhome
USA
12827 Posts |
Posted - 10/15/2011 : 20:49:42
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| Maybe I'll take a photo with my phone whenwe get to Branson. I was surprised to see the reference to RON. Of course I believe the USA & Canada are the only countries to use pump octane. |
Phil
"They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty."
Benjamin Franklin |
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Let's talk about octane.
