Re: [DML] Re: delorean fuel

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Owen Emry wrote:

>No, sorry.  No offense intended, but completely incorrect.  Heptane (i.e., the rest of the fuel) contains more chemical energy than Octane, so the higher the octane, the less chemical energy per unit mass.
>
Hi Owen

Thanks for the correctoin - I've learnt a bit more today! Basically what 
this means is that the slower burn allowed by a higher octane fuel 
results in being able to cram disproportionately more fuel into the 
cylinders. Makes sense, and tells me that the adverts telling us to buy 
optimax because it gives more power is basically rubbish - correct?

(Optimax over here is 98 as opposed to 95 for unleaded - although we 
have a different measuring system)

Martin





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