At idle it can be 50 : 1 or even 100:1
15 air and 1 fuel
Ideally it is 14.7 air to 1 fuel, in an internal combustion engine.
approximately 14:1 depending on ambient temperature, pressure, etc.
32A diesel engine has no throttle plate so it always takes in maximum amount of air and the fuel injected is varied according to load, rpm. It ranges from 50:1 or leaner at idle to stoichiometric...