[Diy_efi] What is stoichometric....really?

[john]

stoichometric is a theoretical chemical point where each molecule of fuel
has a partner of o2 to pair with in combustion

note operative word - theoretical

12.5 or thereabouts (varies between fuels and engines) is the point in the
real world, where there is sufficient fuel in the charge for all of the air
to find a fuel molecule to combust with in the suboptimal real world
conditions of the combustion chamber

j


----- Original Message -----
From: "Derek" <derek_obanion at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, October 11, 2002 6:42 AM
Subject: [Diy_efi] What is stoichometric....really?


> I know it's 14.7:1 ratio for gasoline. But how would you define it?
>
> Here's something I read:
>
> "Stoich is the point where all of the fuel has burned with all of the
available
> oxygen."
>
> This true?
>
> If so, why do I see this statement:
>
> "12.5 is the ratio for maximum power."
>
> If all of the oxygen is gone at a 14.7:1 ratio, where do you get more
power from
> running 12.5:1?
>
> Is the ONLY purpose of the extra 15-20% gasoline to cool the combustion
chamber
> temperatures (knock preventative), or does it serve some other use? If
it's just
> there to cool, I'd think I could (and should) run 14.7 under boost since I
run a
> lot of methanol injection (almost equal in volume flow to the gasoline),
which
> cools 15-20x more than the extra 15-20% gasoline would.
>
>
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