Octane: (R+M)/2 vs. ROZ, US vs. European | FerrariChat
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Octane: (R+M)/2 vs. ROZ, US vs. European

Discussion in 'Technical Q&A' started by sixcarbs, Jun 6, 2006.

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  1. sixcarbs

    sixcarbs F1 World Champ
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    #1 sixcarbs, Jun 6, 2006
    I was wondering if anyone can confirm these comments I found over the web regarding Octane standards in Europe vs. US.

    Can anyone confirm these conversions or comments?

    Is ROZ identical to our RON (Research Octane) or is it a third method?

    Thanks

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    The reason is that the octane numbers in Europe are not the same as in the US. In Europe they use "ROZ" (Research Oktan Zahl), whereas in the US the spec is for the average between ROZ and "MOZ" (Motor Oktan Zahl), which is approx. 10 lower than ROZ. Therefore, a 93 octane US premium is equivalent to 98 octane Super Plus in Germany, and the German 91 octane regular would be posted as 86 octane in the US, ie. very much the same as the regular unleaded here.

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    EU ratings are 95/98, which are equivalent to US ratings of 91/93.
    So, EU 95 octane = US 91 octane and EU 98 octane = US 93 octane.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Steve Magnusson
    #2 Steve Magnusson, Jun 7, 2006
    Yes, those are the same values I've found in the literature -- i.e., the "sensitivity" (RON-MON) is about ~10 for today's modern benzina so you can work out the math they show. With regard to the names, I've never heard of a "different" set of tests -- isn't ROZ just the abbreviation of the deutsches Äquivalent for "research octane number"?
     

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