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Re: M engine - How would you build it?
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Posted by City-Boy McCoy on August 08, 2007 at 14:20:44 from (70.149.222.103):
In Reply to: Re: M engine - How would you build it? posted by the tractor vet on August 08, 2007 at 08:54:46:
Vet: There are two common types of octane measurement in the U.S. The oldest is the RESEARCH OCTANE NUMBER, or RON. That is what we had prior to unleaded for automotive type gasoline. Then, there is the MOTOR OCTANE NUMBER measurement, or MON, also known as "the aviation lean octane rating". Today, we use both measurements combined (R+M/2) for automotive gasoline octane ratings. Normally this formula will be displayed somewhere on gas pumps. Intrepretation: an octane rating of 87 today using the R+M/2 formula, would have a rating of about 92 by the RON formula method of measurement we used back in the 50's and 60's. In Europe and Australia, they still use the RON formula and their unleaded regular has a rating of 95, slightly better than our regular (92) here. So, 87 is not as bad as it sounds when you take into account we are using a different formula to calculate octane ratings than what was used in the 50's and 60's. I'm not saying today's gasoline is as good, I'm just saying it is not as bad as it sounds, either. mike durhan
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