Outer Mixture Preparation
Mixing air and fuel outside the combustion chamber is called outer air/fuel mixture.
How it works
The fuel is either injected via throttle body above the throttle blade called TBI Throttle Body Injection or near the
intake valve in Multi Point Injections in every individual
cylinder. Fuel is atomized with low pressure 1 - 6
bar and injected. Good for mixing is the low pressure in the intake port. The quantity of injected fuel mostly is determined by the duration injection.
For that a good rate of emission cleaning after leaving the engine is important. This is the job of the
lambda-sensor that puts signals about oxygen share to the ECU. Injection and ignition use a common ECU
In petrol and Diesel engines the inner air/fuel mixture known as direct injection takes place during or to the end of the compression stroke. In contrast to Diesel petrol engines need a spark plug for firing (spark