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

[Grant Beaty]

Derek, I asked this before, and basically someone responded that any richer
than 14.2 or so (b/c of some ineffeciencies its not exactly 14.7) is used
for cooling. It makes sense, when you consider that all cars are tuned for
14.7 cruising. The point when all fuel is burned and all O2 is used up
should be the most gas and emissions effecient way to go.

Just another plus for water/alky injection....

Grant

-----Original Message-----
From: Derek <derek_obanion at yahoo.com>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Thursday, October 10, 2002 4:54 PM
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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