Kugelfischer injection system
Brand and type of injection pump: Kugelfischer PL 04-124 01 C1.
Brand and type of injection pump drive belt: Synchroflex 12 T 5/750.
Oil sump capacity: 100cm3 (engine oil SAE 10-SAE 20)
Carbon monoxide content (SO) in spent cans, less than 4.5%.
Nozzles
Brand and type: Kugelfischer DLO-20 D.
Injection start pressure, kg/cm2: 30-38.
K-Jetronic injection system
Since October 1975 at BMW «520i» with four-cylinder engine and from model year 1982 «520i» with a six-cylinder engine, a Bosch K-Jetronic mechanical constant fuel injection system was used.
The principle of operation of the fuel injection system
The fuel pump takes fuel from the fuel tank and is fed into the accumulator in order to maintain the fuel pressure in the system within the range of 1.5-2.4 kg / cm2. Fuel through the filter is supplied under pressure to the fuel dispenser.
Mounted on a movable arm, the pressure plate of the air flow meters, which is installed between the air filter and the throttle valve, deviates depending on the air depression in the engine. The displacement of the pressure plate of the air flow meter is transmitted to the distribution plunger of the fuel dispenser-distributor, thereby determining the amount of fuel supplied. The fuel quantity distributor, depending on the position of the pressure plate of the air flow meter, supplies the required amount of fuel to the engine cylinders through the injectors, ensuring the optimal composition of the fuel-air mixture. The fuel dispenser and air flow meter form a mixture regulator.
Pilot pressure regulator (or the regulator of the composition of the working mixture when the engine warms up) reduces pressure on the control plunger during warm-up of the engine Reducing the control pressure at the same air flow leads to an increase in fuel supply and, consequently, to an enrichment of the combustible mixture.
An additional air supply valve installed in the air duct, made parallel to the throttle valve, brings additional air to the engine during cold start and engine warm-up, which leads to an increase in the engine idle speed.
To facilitate starting a cold engine, an electromagnetic starting nozzle is provided, the opening time of which varies depending on the temperature of the coolant by a thermal time relay.
Adjustment Data
Fuel pressure in the system, kg/cm2: 4.5-5.2.
Control pressure, kg/cm2:
- cold, non-running engine: see graph;
- on a warm idle engine: 2.7-3.1;
- when running a warm engine at idle: 3.4-3.8.
The frequency of rotation of the crankshaft at idle, rpm: 900±50.
Carbon monoxide content (SO) in exhaust gases, %: < 3.
Fine fuel filter
Make and type: Purflux GF 140 1.
mixture regulator («520i» with 6-cylinder engine):
- Brand and type: Bosch 0 438 060 043.
Fuel dispenser
Brand and type:
- «520i» with 4-cylinder engine: Bosch 0 438 120 018;
- «520i» with 6-cylinder engine: Bosch 0 438 100 108.
Air flow meter
Brand and type:
- «520i» with 4-cylinder engine: Bosch 0 438 120 018;
- «520i» with 6-cylinder engine: Bosch 0 438 120 158.
Pilot pressure regulator
Brand and type: Bosch 0 438 140 005.
Injection nozzles
Brand and type:
- «520i» with 4-cylinder engine: Bosch 0 437 502 007;
- «520i» with 6-cylinder engine: Bosch 0 437 502 006.
Injection start pressure, kg/cm2:
- «520i» with 4-cylinder engine: 3.3;
- «520i» with a 6-cylinder engine: 2.7-3.8.
Electromagnetic starting nozzle
Brand and type:
- «520i» with 4-cylinder engine: Bosch 0 280 170 402;
- «520i» with 6-cylinder engine: Bosch 0 280 170 411.
Working pressure, kg/cm2:
- «520i» with 4-cylinder engine: ~4.7;
- «520i» with 6-cylinder engine: 4.5.
Capacity, cm3 /min («520i» with 6-cylinder engine): 95-135.
Thermal time switch
Brand and type:
- «520i» with 4-cylinder engine: Bosch 0 280 130 202;
- «520i» with 6-cylinder engine: Bosch 0 280 130 214.
Contact opening temperature,°С: +35.
Duration of switching on, no more than, s: 8.
Cold start relay
Brand and type: Bosch 0 332 003 028.