9/8/2023 0 Comments Om 422 engine manual![]() ![]() 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. ![]() The OM 352 engine introduced at the 1964 Geneva Motor Show by Mercedes-Benz was the first direct-injection diesel for commercial vehicles.
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