Lambda 1.0

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Mon, 12 May 1997 QSHIPQ@aol.com wrote:

> Not quite.  Lambda = 1.00 or (14.7:1 = Stoichiometric ratio) is when there is
> just enough air to burn all the fuel in the chamber (lowest HC for the "most"
> fuel in the chamber).  This ratio is "picked" by manufacturers (and

Actually, lambda 1.0 = 14.7:1 is the theoretical optimum ratio for 
perfect combustion, with _gasoline_.    Other fuels may have different 
lamda=1.    It isn't picked by anyone, that's just the way it is by its 
own nature.   Even the specific composition of gasoline can change enough 
from one batch to the next to change that ratio by a couple points.

> Catalytic converters, and reduces mileage. 1.05 ("maximum economy")
> unfortunately creates excess CO.  Either extreme of Lambda, will make you

Other oxides of nitrogen are also formed.   That is why they are 
sometimes just referred to generically as NOx.

Since I am not too concerned with emissions, I run my engine very lean on 
cruise, and optimally rich on WOT.

Later,
Graydon D. Stuckey 
EFI 5KCSTQ