The injecting-plant

BOSCH KA-Jetronik

The Injecting-Plant is a KA-Jetronic from Bosch.

There are several variants from, but they operate similar. The petrol pump pressures up to approx. 5 bar, that fits also permanently at the injecting-plant. So you do not need an additional drive, injecting-plants usually have.

The A is in the Name explained: A = driveless. The Fuel is assigned continuous, even a valve is open or not, whether the piston is in power stroke at this time or not.

Therefore K = continuously

For correct function, the air intake amount is measured. For that there is an airflow sensor. Fuel burns optimally with a mean interconnecting number of 14:1. 14 parts of air to come on one part of fuel (is measured in emphasis units).

The airflow sensor (on the picture the big horn), moves during air intake below and touches through to a small plunger that controls the passage of the fuel.

The difference to other methods is for example the air mass measurement. You have to measure the air temparature too to force the correct passage of fuel amount.

Cold air is heavier than warm air as the mass becomes increasingly bigger at same volume with sinking temperature and of course the mean interconnecting number changes through that

There is still a line of technical addition components which appertain to this plant in order to guarantee the perfect function therefore. Some are here mentioned:

- Fuel filter - pressure storage - plenum chamber - warmup and idle control