| No other engine in US history has the heritage
and recognition of the Chrysler Group Hemi. While completely re-engineered
from the legendary 426 Hemi V8 that powered Chrysler muscle cars of the
1960s, the two features that earn the new 5.7-litre Hemi powerplant its
name are:
*The hemispherically shaped combustion chamber designed to accommodate
large valves and put the spark plugs close to the centre of the combustion
chamber.
*The crossflow valve arrangement that is perpendicular to the crankshaft
centreline.
2004 has seen the return of the Hemi engine to the Chrysler line-up |
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Facts and Features
In the Chrysler 300C, Dodge Magnum RT and the all-new 2005 Jeep Grand
Cherokee, the 5.7-litre Hemi is equipped with Chrysler Group's Multi-Displacement
System (MDS), which turns off four of the cylinders when V8 power is
not needed, giving customers up to a 20 percent improvement in fuel economy.
The 5.7-litre Hemi engine is an internally balanced pushrod, OHV 90-degree
V8. The cast-iron block is a deep-skirt design with cross-bolted main
bearing caps. The aluminium cylinder heads feature two valves per cylinder,
hemispherical combustion chambers with dual spark plugs and coil-over-plug
ignition.
An Integrated Air Fuel Module (IAFM) incorporates the function of 26 individual
components in the induction and fuel system, thereby reducing cost, weight
and engine plant complexity.
A feature of the 7.5 litrer 90-degree V8 is the multi-displacement system |
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The 5.7-litre Hemi marks Chrysler Group's first application of an electronic
throttle control in a rear-wheel-drive vehicle. A systematic approach
to sealing, using premium elastomeric materials and state-of-the-art practices,
helps ensure a leak-free, weep-free engine. The power plant's simple and
efficient design means servicing and repairs are easier and less costly.
Specifications
Type and description: Eight cylinders, 90-degree V-type, liquid
cooled.
Displacement: 345 cu. in. (5.7-litre)
Bore x stroke: 3.92 in. x 3.58 in. (99.5 mm x 90.9 mm)
Valve system: Pushrod-operated overhead valves, 16 valves (eight
deactivating, eight conventional when equipped with Multi-Displacement
System), hydraulic roller lifters
Fuel injection: Sequential, multi-port, electronic, returnless Construction:
Deep-skirt cast iron block with cross-bolted main bearing caps.
Aluminum alloy heads with hemispherical combustion chambers
Compression ratio: 9.6:1
Power (SAE net): 345 hp (257 kW) @ 5400 rpm, (61.0 hp/L), truck
applications; 340 hp (254 kW) @ 5000, passenger vehicle applications
Torque (SAE net): 375 lb.-ft. (508 Nm) @ 4200 rpm, truck applications;
390 lb.-ft. (525 Nm) @ 4000, passenger vehicle applications
Max engine speed: 5800 rpm (electronically limited)
Fuel requirement: Unleaded mid-grade, 89 octane (R+M)/2 - recommended;
Unleaded regular, 87 octane (R+M)/2 - acceptable
Oil capacity: 7 qt. (6.6L)
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