Re: Octane ratings (was K-star (was Hot MKI article))

[Mark Peele <type53@yahoo.com>]

--- Bradley Peet <btpeet@effervescent.com> wrote:
> On the subject of fuel and octane, does anyone know
> the formulas for the
> octane rating used in the U.K. (and other European
> countries) as opposed to
> the octane ratings we see at the pumps here in the
> U.S.?  There are terms
> like "research octane" and "anti-knock index" and
> so-forth that would be
> nice to have the definitions of.
> 
> I'm pretty sure when someone from the U.K. says they
> are running 98 octane
> petrol, it is NOT equivalent to 98 octane on our
> scale.  (It's a lower
> number on our scale.)

Chevron Rules!

I pulled this off of Jan's VW Racing page:

The US/Canada uses a different Octane rating system 
at the gas pumps than most other countries.
They use the U.S. Cost of Living Council (CLC) index
which is the average of the Research Octane Number
(RON) and the Motor Octane Number (MON): 

     CLC = (RON + MON) / 2

     RON = Research Octane number (ROZ in Germany)
     MON = Motor Octane Number
     CLC = U.S. Cost of Living Council

This translates to (roughly):
91 RON = 87 CLC (Regular)
95 RON = 91 CLC (Premium) 

http://www-pal.usc.edu/~jan/vw/Engine/Octane_Ratings

HTH!




=====
Mark Peele
1981 Scirocco, 1982 Scirocco, 1978 Scirocco, 1987 Golf GT
http://home.t-online.de/home/Scirocco2/mark.htm
Direct Mail: SCIROCCO_GTX@YAHOO.COM
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