Re: [DML] Accumalator

[Martin Gutkowski <webmaster@xxxx>]

Nobody's pointed out the more obvious reason for higher octane fuel: It has more chemical
energy. With the timing set to take advantage of this, you get more power, otherwise
you'll be exhausting burning gases.

I think there are obvious differences in the way the octane rating is expressed between
here and the US

Cheers

Martin
#1458

B Benson wrote:

> If an engine is designed to use 86 octane that's what you should use. Higher
> octane fuels are blended to combust at a slower pace while lower octane
> fuels burn much faster. This is opposite of what many may think. If you use
> the higher octane fuel the slower combustion can, over a long period of
> time, produce carbon deposits in the combustion chamber which raise the
> compression ratio. Higher compression ratios require higher octane, slower
> burning fuels. Therefore it's possible that your car can develop a
> dependency for high octane at some point. The slow burn of high octanes is
> necessary for turbo cars because the slower burn helps retard detonation
> which is when combustion takes place too early and catches the piston still
> trying to finish the compression cycle while the combustion is trying to
> drive it back down. The higher intake temperatures that come with turbo
> charging create that situation. The bottom line is you're wasting money
> using higher octane fuel if your engine wasn't designed for it.
>
> Bruce Benson


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