<VV> Air Fuel ratios concerns

[BobHelt at aol.com]

In a message dated 10/20/2010 8:46:47 A.M. US Mountain Standard Time,  
dmonasterio at hotmail.com writes:

I know  that a perfect reading should be 14.7 all time 


Daniel,
This isn't correct. 
While 14.7 is a theoretical ideal, Idle usually needs to be richer because  
of the cam overlap diluting the mixture.  And anytime that power is  
required the ratio must get richer to develop that power. It takes more fuel to  
get more power. Finally at moderate speeds and very light engine loads, the  
mixture can be leaner than 14.7 for max economy.
Regards,
Bob Helt