[Lorenfb]

"Chrisbennet,

Thanks for clarifying."

Clarifying what????????

"The 12.6 number is a textbook number I assume. Every motor is different." - Chris Bennett -

The 12.6 is a theoretical value which varies little between ALL engines!
DO SOME READING AND DON'T ALWAYS BELIEVE THE "HEAR-SAY".
Bottomline:
As I said, to control the A/F ratio, requires a feedback element, e.g. an O2 sensor
which is what basically was initially asked. It's B.S. to assume that basic fuel
maps can control the A/F ratios without an O2 sensor over all loads and driving
conditions. THAT'S WHY AN O2 SENSOR IS USED TODAY ON ALL CARS!