Rowland and Wilma Carson wrote:
>
> Steve & Eileen Genotte wrote:
>
> >I am not familiar with European ratings for autogas. What is the octane
> >of "4 star" gasoline?
>
> Steve - I think many people who use 4-star would not be able to answer that
> straight off. My excuse is that I've been driving diesels since 1987. The
> answer to your question is found in British Standard 4040, originally
> published 1967, and revised a few times since. The most recent issue I've
> found is 1988. It specifies a whole load of stuff about the composition of
> the fuel (contaminants, lead content, etc) and its volatility as well as
> the anti-knock rating. It mentions two rating systems: Research Octane
> Number, and Motor Octane Number. I think that RON may be the most universal
> currency (certainly that was the rating commonly quoted in UK before BS4040
> came out), but you might want to set BS4040 beside the appropriate SAE
> document and see if there are significant differences in methods or
> calibration. (A good public library should have all this stuff on fiche or
> CD-ROM.) After this Standard came into use, octane ratings were hardly ever
> quoted, pumps were just marked with the star rating.
>
> BS4040 RON MON
> 2-star 90.0 80.0
> 3-star 93.0 82.0
> 4-star 97.0 86.0
>
> There was also a 5-star grade which I think was 100-octane or slightly
> higher (RON).
>
> This all refers to LEADED petrol (motor spirit / gasoline). Unleaded stuff
> is specified in BS7070 which I can't get hold of at the moment.
>
> HTH
>
> cheers
>
> Rowland
>
>
> ... that's Rowland with a 'w' ...
>
Thanks for the info. On this side of the pond we the call the
equivalent fuel "Premium Unleaded" with an octane rating of 93. I won't
spoil your day by mentioning its price for a U.S. gallon.
Sorry this took so long to send, but I just got back from Oshkosh.
Enjoyed meeting Ivan and Bob Berubi and Kim and everybody. My wife
won't let me sell the car to get the tailplane kit, so I'm back to
saving up for it. <SIGH>
Regards,
Steve Genotte
rhymes with "knot"
|