Mechanical system
13
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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Cylinder head
General
The cylinder head is made of high-strength aluminum.
It is equipped with two camshafts and four valves per
cylinder. The cylinder head cover is made of plastic
with integrated ventilation. The cylinder head is char-
acterized by the following new features:
• Maximum ignition pressure of 200 bar (previously
160
bar)
• Tangential and spiral intake ports
• Bore for piezo injector of 19 mm diameter
The upper duct of the two-piece water jacket supplies
the cylinder
head with coolant. The advantages of the
two-piece water jacket include:
• Greater structural rigidity
• Better heat dissipation
• Improved thermal management
The improved thermal management system is particu-
larly beneficial in those areas which are exposed to
very
high temperatures. The high ignition pressure of
200 bar is only made possible by targeted cooling of
the individual components. The increased pressure
potential and optimized injection quantity are respon-
sible for the high engine torque of 500 Nm and the
en
gine output of 150 kW.
Cross-section of cylinder head
1 Ventilation
2 Main bearing bridge
3 Cylinder head cover
4Glow plug
5 Exhaust valve
6 Piezo injector
7 Intake valve
8 Valve spring
9 Valve clearance compensation
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