Mercedes-Benz OM904 engine
{{Short description|Diesel engine}}
The Mercedes-Benz OM904 is a 4.2 liter (4,249cc) Inline-four engine (I4) OHV Diesel engine with 3 valves per cylinder.{{Cite web|url=https://www.idem.ir/Pages/Products/Engine/EngineEn.aspx?Type=904|title=Diesel Engine OM 904|website=www.idem.ir|access-date=2019-09-13}} It is related to the OM906 Straight-six engine which has two extra cylinders, while the bore and stroke remain unchanged.{{Cite web|url=https://barringtondieselclub.co.za/mercedes/904-906.html|title=Mercedes OM904 - OM906 engine specs, bolt torques, manuals|website=barringtondieselclub.co.za|access-date=2019-09-13}}
It launched in 1996 and had a Unit injector system to deliver fuel to every cylinder. It used a twin-scroll Turbocharger that was giving ~0.5-1.4atm of boost.{{Cite web|url=https://www.fleetnews.co.uk/news/2012/3/14/the-history-of-medium-duty-engines-at-mercedes-benz/42874/|title=The history of medium-duty engines at Mercedes-Benz|website=www.fleetnews.co.uk|language=en|access-date=2019-09-14}}
| class="wikitable"
|+Engine Details !Power: |75-130kW (101-174hp) @ 2,200 rpm !Height: |930mm (36.6in) |
| Torque:
|400-670Nm (295-494lb.ft) @ 1,200-1,600 rpm !Weight: |405kg (893lbs) |
|---|
| Aspiration:
|Twin-scroll turbocharger, intercooler !Injection: |Direct injection |
| Compression Ratio:
|18:1 !Boost: |0.5-1.4atm |
| Bore:
|102mm (4in) !Launch Year: |1996 |
| Stroke:
|130mm (5.1in) ! | |
| Displacement:
|4,249cc (259.3CI) ! | |
| Redline:
|2,300 ! | |
| Length:
|944mm (37.2in) ! | |
| Width:
|610mm (24in) ! | |
