why is rich better for power ??

[Dick Protus]

> 
> >can anyone out there tell me why stoich doesn't make the
> >best power ??
> >
> >Tom Cloud
> >
> >       it IS as bad as you think and they ARE out to get you !!
> >
> >From what I remember, it has something to do with the efficiency of
> combustion - not 100%, and some fuel condensing out on cooler surfaces etc.
> Theoretical stoich does not always mean correct, and you would rather have a
> wee bit of fuel left over than a wee bit of air when going for max power. It
> is, after all, the amount of fuel burned that determines the amount of power
> available. How it is burned determines how much power you get.
> 

	I think most of the confusion about this comes from treating A/F Ratio
before and A/F Ratio after combustion as interchangeable.  Also, remember that
the A/F Ratio after is measured by an EGO sensor.  
	Perfect stoich in would give you lean reading on EGO , for the
reasons already mentioned above.  A carb may need a 12-1 A/F in to get all 
oxygen burnt, injectors should be closer to stoich because they achieve better
atomization to allow for more efficient combustion.   Also, as far as racing
and power go, the rich side of stoich is much more lenient than the lean side
for power tail off and potential engine damage.  
	Just tune for stoich out, its what the professional engine builders I
know do.

dick protus

BTW - Kinsler Fuel Injection Company recommends sizing injectors for a 12-1
      A/F for racing apps.
mentioned above.