Artikel » English » Farewell to the prechamber: first direct-injection engines for trucks and busses arrive in 1964 Artikel-Infos
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English   Farewell to the prechamber: first direct-injection engines for trucks and busses arrive in 1964
05.03.2009 von admin


The new OM 352 was intended for the medium-duty Mannheim trucks with the model designations 1113 and 1114 and for the O 321 H/HL and O 322 busses. The OM 352 with a displacement of 5.7 litres developed exactly 126 hp; the rated engine speed was 2800 rpm. The OM 352 attained its maximum torque of 353 Newton metres at 1600 rpm.


Mercedes-Benz O 321 H with Vetter-Bodywork, Year of construction 1965

Both engines were in for long careers. The 5.7-litre unit, for example, was given more power as turbocharged OM 352 A with 150 hp starting in 1966; later it even was offered with 170 hp; well into the 1980s it was fitted not only in trucks and busses, but in the Unimog too.


Mercedes-Benz O 317 G, Year of construction 1974

The OM 346 lived on even longer, but incognito as it were: as early as in 1967, after its displacement was increased to 11.6 litres by enlarging the stroke from 140 to 150 millimetres, it was renamed OM 355. As such it initially offered 230 hp, from 1969 onwards 240 hp. However, in Europe it had to make way for the new V-engines of the 400 series during the 1970s.

But in the short-nosed conventional trucks that continued to be busily exported all the way up until 1994, the OM 355 was a welcome guest in faraway countries. Alternatively, as naturally aspirated engine with 240 hp, or as turbocharged unit with 280 hp, it provided reliable service in models like the 1924 or 1928.

Across the ocean, the Brazilians, for one, truly appreciated the value of the OM 355. The engine provided decades of service in Brazil, and with turbocharger and intercooler even attained a peak output of 340 hp beginning in 1988.


Photos:
Daimler AG
Omnibusarchiv
Text:
Daimler AG


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