![]() ![]() ![]() ![]() The ignition pressure in the direct-injection diesel rose to around 80 bar compared with 60 bar in the prechamber engine. The fuel spray was directed at the wall of the combustion chamber a swirl duct in the cylinder head provided for the necessary turbulence of the diesel mist in the cylinder. However, it sprayed the fuel into the cylindrical combustion chamber at an angle of about 30 degrees. The Mercedes-Benz design engineers ultimately decided to use a four-hole injection nozzle positioned almost dead-centre in the cylinder. Multi-hole injection nozzles and flat combustion chambers in the pistons were better still for fuel consumption, but likewise led to loud combustion noises and high peak pressures. Particularly if single-hole injection nozzles were used with central combustion in a spherical combustion chamber, extremely loud noises and a high peak pressure were generated. Initially, however, the engines did not run as smoothly as their prechamber cousins. Direct injection results in lower consumption and higher output. manuals OM 366 specs, manuals OM401, OM402 specs, manuals OM 407-409 specs, manuals OM 422-424 specs. The OM 352 engine introduced at the 1964 Geneva Motor Show by Mercedes-Benz was the first direct-injection diesel for commercial vehicles. ServiceWorkshop manual engine Mercedes Benz OM 447. ![]()
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