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The final car to use K-Jetronic was the 1994 Porsche 911 Turbo 3.6. Fuel is pumped from the tank to a large control valve called a fuel distributor, which divides the single fuel supply line from the tank into smaller lines, one for each injector.
The 900 in 1979 was available in three versions of the B-engine: The GL had the single-carb 100 PS (73.5 kW) engine, the GLs had twin carburettors rated at 108 PS (79 kW), the EMS and GLE had Bosch jetronic fuel injection rated 118 PS (87 kW), and the 900 Turbo was rated at 145 PS (107 kW). The only bodywork originally available was the three ...
A low injection pressure results in a low relative air-fuel velocity, which causes large, and slowly vapourising fuel droplets. [8] Therefore, the injection timing has to be precise to minimise unburnt fuel (and thus HC emissions). Because of this, continuously injecting systems such as the Bosch K-Jetronic are obsolete. [1]
By the mid-1980s, JECS were using LH-Jetronic, and the new Bosch hotwire mass airflow meter. The early JECS LH-Jetronic systems were based on a Motorola 6800 architecture, using many Hitachi components. The earliest hotwire meters were still from Germany, but by the end of the 1980s all of the system components (pumps, sensors, injectors, ECU ...
In 1974, Bosch introduced the K-Jetronic system, which used a continuous flow of fuel from the injectors (rather than the pulsed flow of the D-Jetronic system). K-Jetronic was a mechanical injection system, using a plunger actuated by the intake manifold pressure which then controlled the fuel flow to the injectors. [55]
E - high compression, no catalyst, mechanical fuel injection K-Jetronic; BxxET - K-Jetronic turbo; B2xxET - Motronic controlled electronic fuel injection, turbo. F - low compression (9.8:1 on B230F, 9.5:1 on B280F, 10.0:1 on B234F and 10.7:1 on B204F), US/Europe version (F for Federal) with catalytic converter. Europe/APAC version, fuel ...
The M110.984 was the first engine with the new Bosch K-Jetronic injection. This system is mechanical. The air that is taken in is weighed to then determine the amount of fuel to inject. Power output: 130 kW (177 PS; 174 hp) at 6000 rpm up to April 1978; 136 kW (185 PS; 182 hp) at 5800 rpm from April 1978. Applications: 1975-1981 280E (W123)
The K-Jetronic system is mechanical, with a high-pressure pump which streams fuel continuously to the injectors; it does not have a computer, just a few relays to handle the cold start sequence etc. The chassis was also based on the 308 GT4, but with a 100 mm-longer (3.9 in) wheelbase at 2,650 mm (104.3 in).