[Diy_efi] Knock retard and Race gas

[Tom Visel]

A cleaner burn might be achieved if preignition were avoided. :)

I know empirically that higher octane pump fuel leads to harder starts 
in cold weather at high altitudes.  I am taught that this is due to its 
lesser volatility.  Since increased volatility improves mixture 
homogeneity, it would be reasonable to assume (EPA tests pending) that 
fuel of higher octane actually gives a less clean burn, with pockets of 
richer and leaner mixture in the chamber. 

Fewer deposits do generally follow the use of a "top tier" fuel, which 
most folks think they're getting when they buy premium.  I used to think 
the "Chevron with Techron" smiley-car commercials were BS until I'd 
replaced or cleaned enough GM Vortec injectors and read about the spec 
fuel GM used to develop and test those injectors.  Care to guess the brand?

TomV

Rob Weinstock wrote:

>> Rob is there no benefit of better combustion because of cleaner 
>> burn....????
>
>
> Is there any evidence of "cleaner burn", like reduced emissions, fewer 
> deposits, etc.? I don't believe there's a real benefit here.
>
> Rob
>
>
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