Octane conversion?

[theswede]

Hi!

Over here on the other side of the pond we measure the octane of gas somewhat differently than the US, and I was wondering if anyone knows how to convert between the two?
I get pretty confused by all you guys refering to 93octane as premium, we can't get anything lower than 95 here...

/Otto

[Rebel]

Ya, there are a couple different rating systems for octane, I don't know why we can't all use the same system. you use one called RON or research octane number. another rating is called MON, or motor octane number
RON 95 = MON 83

here is a calculator;

www.csgnetwork.com/octaneratecalc.html

Our federal Government requires an average of those two ratings to be posted on our pumps. At least that is what I found on google.

95 + 83 divided by 2 = 89 (our magical number)

[theswede]

Aha! Thanks Rebel.
It seems Wikipedia has more information on this than anyone ever will need (as often before)
en.wikipedia.org/wiki/Octane_rating
If I read this correctly it means that the stuff I run my scooter on would be rated as 95 octane in the US.
Hrm... Got to look into advancing the ignition timing...

[Rebel]

Oh ya, at 95 octane you could bump the timing up. You know you can just make some slots in the pick up sensor for the timing and slide it over a hair to change the timing right. take the sensor off, and use a file on the mounting holes to make them wider.

[theswede]

I am supposed to get a new CDI shortly with a different timing curve, I'll try that first and post the results.

/Otto