On 12 Nov 2008, at 19:46, Ron Jones wrote:

> I know nuthin....  IIRC Cetane for diesel is a bit like octane for  
> petrol.
> It's typical that they have to use a very old out of date trivial  
> name (I've
> never heard anyone use it, except in relation to diesel) - almost  
> as bad as
> the petrol one.
> 100 Octane refers to 100% of iso-octane, (a very bad trivial name -  
> iso
> usually means one methyl not three) who's real name is
> 2,2,4-Trimethylpentane.
> Cetane's real name is Hexadecane

Well, with your name you should be able to hold forth on octane  
ratings at least :-)

Baz

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