System Comparison - Mercedes-Benz OM 651 Service Manual

System comparison

Comparison
Market launch
Combustion system
No. of cylinders
Engine configuration
Bore
Stroke
Compression ratio
Camshafts – drive
Camshafts – number
Valve actuation
Turbocharger type
Boost pressure control
Measures for low-emission
combustion
Fuel injector – type
Fuel injector – diameter
Firing order
Oil pump – drive
Alternator – current rating
Engine weight DIN (dry) approx.
10
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
q
mm
mm
e
mm
A
kg
– This printout will not be recorded by the update service. Status: 09 / 2008 –
Engine 646.821EVO
C 220 CDI
06 / 2006
Diesel direct injection
88.3
88.3
16.5:1
Duplex chain
2
Cup tappet
with hydraulic valve
clearance compensation
1-stage turbocharging with
variable turbine geometry
Electric
Intake port shutoff,
exhaust gas recirculation
(EGR) with separate EGR
cooler
Solenoid injector
17
1-3-4-2
Simplex chain
200
190
Engine 651.911
C 250 CDI
10 / 2008
4
Inline
83.0
99.0
16.2:1
Simplex chain
2
Roller-type cam follower
with hydraulic valve
clearance compensation
2-stage turbocharging with
fixed geometry
Pneumatic
Intake port shutoff, EGR
cooling and EGR bypass
Directly controlled piezo
injector
19
Gear drive
180
203