Engine

New engines deliver performance and power

3.0-liter V-6 Engine

The all-new 3.0-litre V-6 CRD engine is a "next-generation" power unit from the DaimlerChrysler Group producing class-leading levels of power and torque, with good fuel economy. With Bosch high-pressure fuel injection (2000+ bar), a variable geometry turbocharger and four valves per cylinder, the new engine meets Euro 4 emissions standards without a diesel particulate filter. Maximum power is 160 kW (218 hp DIN) and peak torque is 510 Nm (376 lb.-ft.) from just 1800 rpm.

4.7-liter, V-8 Engine

The 4.7-liter V-8 is the mid-range engine in Grand Cherokee. The engine produces 235 horsepower (175 kW) at 4,500 rpm and 305 lb.-ft. (414 Nm) of torque at 3,600 rpm. Dual knock sensors enable improved engine calibration for both fuel economy and power output.

The engine has improved NVH characteristics, realized through the use of composite valve covers, structural improvements to the air box and resonator and improved dampening of the heat shields.

5.7-liter HEMI V-8 Engine

The modern HEMI engine has been engineered to deliver outstanding performance and reduced noise, vibration and harshness (NVH), resulting in a highly refined powerplant. The engine gives the Grand Cherokee best-in-class power, while 90 percent of the engine’s peak torque is available from 2,900 rpm through 5,100 rpm for excellent performance. The engine produces 330 horsepower (246 kW) at 5,000 rpm and 375 lb.-ft. (509 Nm) at 4,000 rpm.

Fuel economy has also been improved, but not at the expense of HEMI performance. Chrysler Group has developed the Multi-Displacement System (MDS) that deactivates four cylinders when the V-8 is not needed. Chrysler Group is the first manufacturer to offer fuel-conserving MDS in an SUV.

The Chrysler Group MDS seamlessly alternates between smooth, high fuel-economy four-cylinder mode when less power is needed and V-8 mode when more power from the 5.7-liter HEMI engine is in demand. This optimizes fuel economy when V-8 power is not needed, without sacrificing vehicle performance or towing capability.

As a result, consumers will experience estimated fuel economy gains of up to 20 percent under various driving conditions. Improved fuel economy is realized without any change in the customer’s driving experience.

Some of the significant technologies enabling MDS include the speed of electronic controls, the sophistication of the algorithms controlling the systems and the use of Electronic Throttle Control (ETC). The HEMI is able to transition from eight cylinders to four in 40 milliseconds.

This 5.7-liter HEMI V-8 engine with MDS has completed over 6.5 million customer-equivalent miles through Chrysler Group’s development and durability testing.

The HEMI engine that powers the Jeep Grand Cherokee uses aluminum cylinder heads with hemispherical combustion chambers, creating outstanding airflow leading to high power and torque. Dual ignition (two spark plugs per cylinder) increases peak power and torque, reduces exhaust emissions, increases fuel economy and provides a smooth idle. The combustion system has been refined and the engine uses direct-mount accessories for quieter operation.