New 3.0-liter turbo, direct-injection V-6 diesel engine now available for the all-new 2011 Jeep® Grand Cherokee. The new engine is more powerful, more fuel efficient and produces lower emissions than its predecessor. Built by VM Motori and developed together with Fiat Powertrain, company of Fiat S.p.a., the new 3.0-liter turbo diesel engine produces maximum power of 177 kW (241 hp DIN) at 4,000 rpm and torque of 550 Nom (406 lb-ft) at 1,800-2,800 rpm. This translates to 10 percent more power and eight percent more torque than the engine it replaces.

Even with its improved performance, fuel economy for the new 3.0-liter turbo diesel engine is 8.3 L/100km on the combined cycle, an improvement of 19 percent over the prior diesel engine. CO2 emissions (combined cycle) are also reduced by 20 percent, now at 218 g/km. The new V6 turbodiesel is fitted with new-generation, 1800 bar injectors with new MultiJet II technology, developed and patented by Fiat Powertrain and which made its début in 2009 on the 1.3 Small Diesel Engine equipped on the Punto Evo.

Engine Block Structure

The new 3.0-liter turbo diesel engine features a compressed graphite iron, 60-degree block with aluminum cylinder heads and a two-piece structural aluminum oil pan. Bore is 83 mm (3.27 in) and stroke is 92 mm (3.62 in) for a total displacement of 2987 cm3 (182 in3). Bore spacing is 96 mm (3.78 in).

The engine is compact and lightweight, with overall dimensions of 695 mm (27.36 in) in length, 729 mm (28.7 in) in width and 697.5 mm (27.46 in) in height. Weight of the fully dressed new engine is 230 kg (507 lbs).

The engine block features a crankcase architecture with stiffened construction, including a bedplate that provides a rigid and stiff carrier for the crankshaft. This in turn helps reduce overall noise from the lower reciprocating assembly and contributes to significant improvements in overall noise, vibration and harshness.

Adding to the structural rigidity of the block, the two-piece aluminum oil pan has been designed to provide strength and contribute to the quietness of the engine. The lower pan has been reinforced for off-road use. Crankcase capacity is 7.7 L (2 gal).

Cylinder heads are constructed of aluminum and feature a chain-driven, dual overhead-camshaft design with four valves per cylinder. Intake valves measure 28 mm (1.1 in), and exhaust valves are 24.5 mm (0.96 in) in diameter. Combustion-chamber volume is 24.68 cm3 (1.51 in3).

A forged-steel crankshaft is supported by four main bearing journals fitted with four-bolt main bearing caps incorporated into the bedplate. Externally balanced, the crankshaft measures 442.2 mm (17.41 in), reducing the overall packaging requirements of the engine. Connecting rods, with an overall length of 162.9 mm (6.41 in), are constructed of cast iron.

Lightweight, cast-aluminum pistons are redesigned to provide minimal friction. The compression ratio of the new diesel engine is now 16.5:1, reduced from 18.1:1 on the previous model, contributing to cleaner combustion and providing more power.

All main bearings are a "lead free" design for reduced environmental impact during construction and later recycling of the engine.

Engine Performance Features

The induction system includes swirl control to optimize combustion. Fitted between the intake system and the combustion chamber, the swirl control effectively provides an ideal air/fuel mixture at all levels of engine speed.

Precise fuel delivery is through a 1,800-bar common-rail fuel-injection system. Thanks to the new MultiJet II technology, which makes use of a special balanced solenoid valve, the new injector is capable of making up to 8 injection per cycle with the possibility of managing the two main injections in a single modular profile (IRS - Injection Rate Shaping) thus guaranteeing a reduction in consumption and polluting emissions of approximately 2% compared to a traditional injector and ensuring a drastic reduction in noise levels.

The new 3.0-liter diesel engine utilizes a single Garrett VGT 2056 turbocharger with variable turbine geometry. Compact and lightweight, the turbocharger provides near-instant response and includes an air-to-air intercooler.

Fuel Economy and Emissions

Fuel economy for the Jeep Grand Cherokee with the 3.0-liter turbo diesel engine is rated at 10.3 L/100 km on the urban cycle and 7.2 L/100 km on the extra-urban cycle. For the combined cycle, the fuel economy is rated at 8.3 L/100 km.

The engine is designed to run on EN590 ultra-low-sulfur diesel fuel.

For this engine, cast-iron exhaust manifolds are utilized. Additional emissions controls include a close-coupled diesel oxidation catalyst and standard diesel particulate filter. Euro 5 emissions are met through an exhaust-gas recirculation (EGR) system that includes an EGR valve with DC motor and a high-performance EGR cooler with bypass valve.

CO2 emissions are reduced to 270 g/km for the urban cycle and 188 g/km for the extra-urban cycle. Combined-cycle CO2 emissions are now 218 g/km.

The 3.6-liter V-6 engine, part of Chrysler’s $3.6 billion powertrain offensive, is introduced for the first time in the all-new 2011 Jeep Grand Cherokee. The more fuel efficient V-6 engine features 11 percent improved fuel economy, 33 percent improved horsepower, 11 percent improved torque. Environmental-friendly design: lead-free engine, recyclable oil filter element with no-spill removable feature. “The engine team went out and benchmarked the best in V6s – your Toyotas and Hondas. Found all the elements from each of them to come up with the best V6,” said Matt Nyquist, Jeep Product Planning.

“The all-new Pentastar is the most advanced six-cylinder engine Chrysler has ever offered,” said Bob Lee, Vice President—Powertrain Product Team. “This new family of engines uses an architecture conceived with future technology growth and integration in mind.” The all-new 3.6-liter V-6 engine is an all-new design featuring double-overhead camshafts (DOHC) and a high-pressure die-cast aluminum cylinder block in a 60-degree configuration.

“Our all-new engine delivers better performance and the capability Jeep customers demand.” “Similar to what we did with the HEMI® engine, our engineers used the best combination of design features and technologies to create an engine that satisfies customer requirements”. “The elegantly simple design maximizes the functionality of each design element rather than adding technology to claim a feature. The result gives our customers everything they demand from an engine today—class-leading levels of refinement, fuel-efficiency, performance and cost of ownership.”

The 3.6-liter V-6 engine design features a double-overhead cam (DOHC) and high-flow intake and exhaust ports, which in combination with VVT via dual independent cam phasing, allows optimum volumetric and combustion efficiency over the full speed and load range. This results in an exceptional, flat torque curve along with high specific power. The engine’s torque exceeds 90 percent of its peak value from 1,600 to 6,400 rpm, which provides customers with outstanding drivability and responsiveness.

The all-new 3.6-liter V-6 engine will deliver 290 horsepower (216 kW) at 6,350 rpm and 260 lb.-ft. (353 N•m) of torque at 4,300 rpm, an increase of 38 percent in horsepower and 11 percent in torque over its predecessor, while providing customers up to an 11 percent improvement in fuel economy. The Pentastar V-6 is designed to run on regular gasoline, offering a 10 percent reduction in fuel cost compared with premium fueled engines. The engine also is flex-fuel capable, offering consumers the choice of gasoline or E85 fuel.

An environmental-friendly oil filter system with optional integrated oil cooler is used to help protect the environment via incineration of the filter element. The use of long-life spark plugs and a high-energy coil-on-plug ignition system also helps reduce cost of ownership.

Refinement was a key objective for every component during the design phase of the engine and was achieved by utilizing advanced computer-aided engineering techniques. Structural, intake and exhaust areas of the engine are designed to deliver low levels of overall noise and achieve specific sound quality goals that meet discerning customer requirements. The result is a refined engine in all applications. Idle quality refinement is improved due to use of the dual independent cam phasing.

In developing the Jeep Grand Cherokee’s all-new 3.6L V6 engine, reliability and quality are assured via extensive validation testing. More than 3.3 million customer equivalent miles were accrued on engine dynamometers prior to production. Test severity was increased by 50% versus previous Chrysler V6 engines in order to accommodate high load applications such as trailer-towing.

The all-new 2nd generation 5.7-liter HEMI V-8 Eagle engine offers better fuel economy, improved idle quality and overall refinement, along with more horsepower and torque. HEMI has always been synonymous with power, and now - thanks to VVT, expanded four-cylinder mode in the MDS system, and a host of other technologies - Chrysler's new HEMI delivers more fuel efficiency and refinement, along with even more power. Other enhancements include an increased compression ratio and an active intake manifold with long runners for low-end torque and short runners for high-rpm power. The cylinder head port flow efficiency has also been improved.

The HEMI's new VVT improves fuel economy under some conditions in two ways. First, it reduces the engine's pumping work by closing the intake valve later. Second, it increases the expansion process of the combustion event. This allows more work to be transferred to the crankshaft instead of being rejected out of the exhaust port as heat. Essentially, VVT optimizes engine breathing, which improves engine efficiency and power.

The fuel-saving MDS system seamlessly alternates between smooth, high- fuel-economy four-cylinder mode when less power is needed, and V-8 mode when more power from the new 5.7-liter HEMI engine is in demand. An expanded MDS operating range in the new-for-2009 HEMI will allow customers to realize an even-greater fuel economy benefit. When MDS is operating, it is indicated by the fuel-economy- mode readout in the Electronic Vehicle Information Center.

For the 2011 model year, the 5.7L produces increased power and torque over the previous model, delivering 360 horsepower (268 kW) and 390 lb.-ft. of torque (520 N•m) @ 4,250 rpm and features Variable-valve Timing (VVT) and fuel-saving MDS technology with dual exhaust to maximize efficiency – 14 city / 20 hwy—2WD and 13 city / 19 hwy—4WD (estimated EPA Fuel Economy mpg).

Powering the 2012 Jeep Grand Cherokee SRT8 is Chrysler Group’s all-new 6.4-liter HEMI® V-8 with Fuel Saver Technology that delivers an estimated 465 horsepower and 465 lb.-ft. of torque – an improvement of 45 horsepower and 45 lb.-ft. torque over the 6.1-liter HEMI V-8 it replaces. The newest HEMI engine in the SRT product lineup provides an additional 90 lb.-ft. of torque at 2,900 rpm versus the previous 6.1-liter V-8 engine.

An active intake manifold and high-lift camshaft with cam phasing delivers maximum low-end torque while optimizing high-end power across a wider and improved rpm band. Specifically, 90-percent of peak torque is available between 2,800 and 6,000 rpm, allowing for inspired standing starts and improved straight-line performance.

Standard Fuel Saver Technology and a new-for-2012 active valve exhaust system allows four-cylinder operation to engage over a wider rpm range, to deliver both improved fuel efficiency – an estimated 13-percent increase on the highway – and an extended range of approximately 450 miles on one tank of gas.