Jeep WK Grand Cherokee Engine Features & Specifications

By Jeep Experts

Welcome to the jeepExperts.com in-depth web page on the WK Generation Jeep Grand Cherokee’s engine options & specs. Did we miss something? Please get in contact with us and inform us about it!

 

WK engine options

3.0-liter Turbo Diesel (2007-2008*)

215 hp / 376 lb-ft torque
 

 

The 3.0-liter V-6 “frequent rail” direct injection engine is a 72°, overhead valve design. The engine make the most of a solid aluminum cylinder block molded round forged iron piston sleeves. The engine has aluminum cross stream cylinder heads, 4 valves per cylinder, central injectors and twin overhead camshafts. The 3.0L is turbocharged, intercooled, and likewise geared up with a EGR cooler.

Additional options are:

Finger Follower Actuated Valves with Hydraulic Adjusters
Counter Rotating Balance Shaft
Oil Jet Cooled Pistons
Swirl Intake Ports
Chain pushed D.O.H.C. per financial institution of cylinders, with 4 valves per cylinder

*2007, 2008 and 2008.5 mannequin years solely. Production of this engine resulted in November 2008.

 

3.7-liter V6 (2005-2010)
210 hp / 235 lb-ft torque
 

 

The 3.7-liter V-6 engine supplies the 2005 Jeep Grand Cherokee with an environment friendly, sturdy and easy base engine. It produces 210 hp (157 kW) @5200 rpm and 235 lb-ft (319 N•m) @4000 rpm. The 3.7-liter SOHC V-6 will exchange and ship much more peak energy than the earlier 4.0-liter I-6 within the Jeep Grand Cherokee lineup. The engine was first launched within the Jeep Liberty and has been constantly refined to supply easy V-6 energy with optimum economic system.

Significant adjustments within the 3.7-liter embrace a revised cam profile and new valve lash adjusters. These adjustments enhance the engine smoothness at idle. To guarantee quiet operation, a brand new thick-wall composite manifold is new for 2005, as are structural enhancements to the air field and resonator. The cylinder head has been redesigned, rising the compression ratio to 9.7:1. The 3.7-liter now makes use of plastic cylinder head covers.

4.7-liter V8 (2005-2007)
235 hp / 290 lb-ft torque
 

 

The 4.7-liter V-8 was up to date for the 2005 mannequin 12 months and was the mid-range engine in 2005-2007 mannequin Grand Cherokees. The engine produces 235 hp (172 kW) @ 4700 rpm and 290 lb-ft (393 N•m) of torque @ 3700. Dual knock sensors have been added for 2005 and allow improved engine calibration for each gasoline economic system and energy output. The up to date engine has improved NVH traits, realized by way of using composite valve covers, structural enhancements to the air field and resonator and improved dampening of the warmth shields. An EGR valve is now used to cut back NOX emissions whereas bettering gasoline economic system by changing among the incoming gasoline/air combination with inert exhaust fuel.

The Dana company provided the brand new reduced-tension piston rings and the rod bearings. Dana additionally provided the brand new cylinder-head, cam-cover module. The new thermoset plastic cylinder-head cowl module was developed in simply 12 months and replaces a magnesium part. Due to revolutionary manufacturing processes, Dana was in a position to scale back the general value of the module, whereas incrementally bettering noise, vibration, and harshness, or NVH.

The vinyl ester glass-reinforced thermoset plastic modules, that are distinctive to the left- and right-side cylinders, embrace the quilt, gasket, and fasteners. These parts are produced at Dana’s Composite Sealing Center in Paris, Tenn. With this new sealing system, Dana developed a customized compound materials for gaskets and grommets. Dana additionally offered prototyping for the gasket and isolator molds to make sure the design met all of Jeep’s specs. The system depends on a self-retaining, “press-in-place” gasket to enhance perform and high quality consistency. This innovation eliminates the time- consuming and expensive steps of exactly aligning and attaching the gasket to the valve cowl with adhesive.

Dana engineers labored carefully with DaimlerChrysler’s technical employees to supply 3-D strong fashions to suit tight, under-the-hood necessities. Dana additionally offered materials growth and part validation to make sure strong system efficiency. This collaborative effort eradicated the prototype step for the quilt housing, which in flip diminished growth time and price by permitting the part to maneuver immediately from design to manufacturing.

4.7-liter V8 (2008-2009)
305 hp / 334 lb-ft torque
 

 

2008 fashions of the Grand Cherokee and Commander will function a brand new up to date 4.7-liter V-8. The new engine affords higher gasoline economic system, energy, and torque than the earlier 4.7-liter engine, whereas rising refinement, due to twin spark plugs per cylinder, elevated compression, higher cylinder-head port stream, and a brand new combustion system. The result’s 305 horsepower, a 30 p.c enhance; and 334 lb.-ft. of torque, a ten p.c enhance. The engine remains to be able to working on E85 ethanol gasoline. Smoother and quieter operating got here from revisions to the induction system, a light-weight piston/rod meeting, diminished accent drive noise by way of decrease accent drive pace, and a brand new valve-lash adjuster system. The new 4.7-liter V-8 can be geared up with Electronic Throttle Control.

 

5.7-liter V8 HEMI (2005-2008)
330 hp / 375 lb-ft torque
 

 

The 5.7-Liter V-8 HEMI engine that powers the 2005-2008 Jeep Grand Cherokee makes use of aluminum cylinder heads with hemispherical combustion chambers, creating excellent airflow resulting in excessive energy and torque. The engine produces 330 hp (246 kW) @5000 rpm and 375 lb-ft (502 N•m) @4000 rpm. Dual ignition (two spark plugs per cylinder) will increase peak energy and torque, reduces exhaust emissions, will increase gasoline economic system and supplies a easy idle. The combustion system has been refined and the engine makes use of direct-mount equipment for quieter operation.

“Two legends mix with the introduction of the trendy HEMI V-8 within the 2005 Jeep Grand Cherokee,” mentioned Eric Ridenour, Executive Vice President—Product Development. “The HEMI is probably the most highly effective engine ever supplied in a Grand Cherokee and simply provides the automobile best-in-class energy.”

Fuel economic system has additionally been improved, however not on the expense of HEMI efficiency. Chrysler Group has developed the Multi-Displacement System (MDS) that deactivates 4 cylinders when the V-8 will not be wanted. The 2005 Grand Cherokee is the primary SUV to supply fuel-conserving MDS.

The Chrysler Group MDS seamlessly alternates between easy and financial four-cylinder mode when much less energy is required and V-8 mode when extra energy from the 5.7-liter HEMI engine is in demand. This optimizes gasoline economic system when V-8 energy will not be wanted with out sacrificing automobile efficiency or towing functionality.

“The MDS was a part of the engine’s unique design,” mentioned Bob Lee, Vice President—Powertrain Product Team. “This leads to a cylinder deactivation system that’s elegantly easy and utterly built-in into the engine design. The advantages are fewer elements, most reliability and decrease value.”

Some of the numerous applied sciences enabling the MDS are the pace of digital controls, the sophistication of the algorithms controlling the programs and using Electronic Throttle Control. The HEMI is ready to transition from eight cylinders to 4 in 40 milliseconds.

This engine and MDS has accomplished over 6.5 million customer-equivalent miles by way of Chrysler Group’s growth and sturdiness testing. It is roofed by the seven-year/70,000-mile Limited Powertrain guarantee.

The HEMI engine that powers the 2005 Jeep Grand Cherokee makes use of aluminum cylinder heads with hemispherical combustion chambers, creating excellent airflow resulting in excessive energy and torque. Dual ignition (two spark plugs per cylinder) will increase peak energy and torque, reduces exhaust emissions, will increase gasoline economic system and supplies a easy idle. The combustion system has been refined and the engine makes use of direct-mount equipment for quieter operation.

 

 

Engine parts from the 2005-2008 5.7-Liter MDS Hemi engine.
 
5.7-liter V8 HEMI VVT (2009-2010)
357 hp / 389 lb-ft torque
 

 

The all-new 2nd era 5.7-liter HEMI V-8 engine affords higher gasoline economic system, improved idle high quality and general refinement, together with extra horsepower and torque. HEMI has all the time been synonymous with energy, and now – due to VVT, expanded four-cylinder mode within the MDS system, and a number of different applied sciences – Chrysler’s new HEMI delivers extra gasoline effectivity and refinement, together with much more energy. Other enhancements embrace an elevated compression ratio and an energetic consumption manifold with lengthy runners for low-end torque and brief runners for high-rpm energy. The cylinder head port stream effectivity has additionally been improved.

See also  Jeep WK Grand Cherokee Electronic Stability Program (ESP)

The HEMI’s new VVT improves gasoline economic system below some circumstances in two methods. First, it reduces the engine’s pumping work by closing the consumption valve later. Second, it will increase the enlargement strategy of the combustion occasion. This permits extra work to be transferred to the crankshaft as a substitute of being rejected out of the exhaust port as warmth. Essentially, VVT optimizes engine respiration, which improves engine effectivity and energy.

The fuel-saving MDS system seamlessly alternates between easy, high- fuel-economy four-cylinder mode when much less energy is required, and V-8 mode when extra energy from the brand new 5.7-liter HEMI engine is in demand. An expanded MDS working vary within the new-for-2009 HEMI will permit clients to comprehend an even-greater gasoline economic system profit. When MDS is working, it’s indicated by the fuel-economy- mode readout within the Electronic Vehicle Information Center.

 

6.1-liter V8 HEMI (2006-2010)
420 hp / 420 lb-ft torque
 

 

The 6.1L-liter V8 HEMI made its Jeep debut within the 2006 Grand Cherokee SRT8 which went on sale in January of 2006. When SRT powertrain engineers got down to develop a extra highly effective HEMI they have been aware of the engine’s heritage, which led to adopting conventional HEMI engine cues together with an orange-painted cylinder block and black valve covers. SRT engineers who developed the 6.1L engine achieved extra horsepower by including extra cubic inches, rising the compression ratio, and redesigning the cylinder head, consumption and exhaust programs for higher stream and elevated engine pace.

For extra displacement, SRT engineers bored out the diameter of the cylinders within the HEMI by 3.5 millimeters every as a way to enhance the entire displacement to six.1 liters from 5.7 liters. Compression ratio was additionally elevated to 10.3:1 from 9.6:1, rising engine effectivity and energy. Cylinders are honed with torque plates to make sure a more true bore, to cut back friction and enhance energy.

Engine respiration was elevated with new higher-flow cylinder heads, a specifically designed consumption manifold, and exhaust headers with particular person tubes encased in a chrome steel shell, all distinctive to the 6.1-liter HEMI engine. Larger-diameter valves and reshaped ports within the heads permit for maximized air stream. The consumption manifold was designed with bigger diameter and shorter runners for higher-speed tuning. Exhaust runners permit elevated fuel stream whereas sustaining quick catalyst light-off, whereas including 12 horsepower over the 5.7-liter engine’s solid manifolds. Exhaust is routed by way of a big diameter (2.75-inch vs. 2.5-inch) exhaust system with 3.5-inch chrome suggestions.

To additional enhance horsepower, performance-oriented camshaft profiles have been developed to permit extra air out and in of the cylinders, in addition to handle a better engine pace. A billet metal, high-strength camshaft options extra overlap and carry for higher efficiency. Silent chain, 5-bearings. Bi-metal materials besides quantity 3 Babbit. Deep-fillet rolled journals for improved fatigue life, press match damper to attenuate torsional vibration.

SRT engineers elevated the HEMI’s peak energy output engine pace by almost 20 p.c to six,000 revolutions per minute (rpm) from 5,000 rpm. Intake and exhaust valve stems are hole, and the exhaust valve stems are full of sodium to assist dissipate warmth extra effectively.

The high-performance SRT 6.1-liter HEMI is strengthened with redesigned parts, together with a bolstered engine block, solid micro-alloy metal crankshaft with retuned damper, high-strength powdered steel connecting rods and floating-pin pistons. The pistons are cooled by oil squirters, aimed on the underside of every piston to help piston cooling for engine sturdiness. A particular oil pump stress reduction valve is added to accommodate the squirter oil stream. The oil pan and windage tray are modified to handle oil return to the pan sump at excessive engine speeds and enhance energy.

 

6.4-liter V8 HEMI (2011-2012 mannequin years)
 

 

A 6.4L-liter V8 HEMI with MDS has been accredited for manufacturing and can debut in SRT8 fashions of the 2011 Challenger, the 2011 Charger and the 2011 300C. The Jeep Grand Cherokee may also obtain this engine within the 2012 mannequin 12 months. The manufacturing model of the 6.4 engine is predicted to provide wherever from 470-hp to 510-hp.

 

 

WK engine specs – Part I

3.7L V8     4.7L V8    4.7L V8 Gen II

 

 

 

 

 

 

 

 

Description 3.7-L V6 (2005-2010) 4.7-L V8 (2005-2007) 4.7-L V8 Gen II (2008-2010)
General
Air cleaner aspect / Intake system Standard air consumption system Standard air consumption system Standard air consumption system
Bore x stroke 93.0 mm (3.66 in.)
90.8mm (3.57 in.)
93.0 mm (3.66 in.)
86.5mm (3.40 in.)
93.0 mm (3.66 in.)
86.5mm (3.40 in.)
Coolant capability 14.0 qt. (13.25-liter) 14.0 qt. (13.25-liter) 14.0 qt. (13.25-liter)
Compression Ratio 9.7:1 9.0:1 9.8:1
Displacement 3.7 Liters / 226 C.I. 4.7 Liters / 287 C.I. 4.7 Liters / 287 C.I.
Engine sort 90° SOHC V-6 90° SOHC V-8 90° SOHC V-8
Engine pace, most 5800 RPM 6000 RPM 6000 RPM
Engine pace, tachometer redline 5300 RPM
Firing Order 1-6-5-4-3-2 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2
Fuel requirement Regular unleaded, 87 octane Regular unleaded, 87 octane Regular unleaded, 87 octane
E85 appropriate
Injectors stream = 22.5 lb/hr @ 49psi
Knock sensor(s) Two (Stereo) Two (Stereo) Two (Stereo)
Lead Cylinder # 1 Left Bank # 1 Left Bank # 1 Left Bank
Oil Capacity 5 Quarts(5W-30) 6 Quarts(5W-30) 6 Quarts(5W-30)
Oil stress At curb idle: 04 psi minimal
@3000 rpm: 25-110 psi
At curb idle: 04 psi minimal
@3000 rpm: 25 psi
At curb idle: 04 psi minimal
@3000 rpm: 25-110 psi
Power (SAE internet) 211 BHP @ 5200 RPM 235 BHP @ 4800 RPM 305 BHP @ 5650 RPM
Spark plugs Type: ZFR6F-11G (NGK)Standard resistor-type

OEM P/N SPZFR6F11G

MSRP: $3.30 ea.

0.43 in. hole

3/4″ attain, 5/8″ Hex head

Torque to twenty Ft. lbs.

 

Type: RC12MCC4“Fired in suppressor seal” spark plugs utilizing a copper core floor electrode.

OEM P/N SPRC12MCC4
(previously 56028236AA)

MSRP: $3.30 ea.

0.40 in. hole

3/4″ attain, 5/8″ Hex head

Torque to twenty Ft. lbs.

(NOTE: The 4.7L V–8 engine is supplied with copper core floor electrode spark plugs. They have to be changed with the identical sort/quantity spark plug as the unique. If one other spark plug is substituted, preignition will end result.)

 

Type: FR8TE2 (consumption)
Type: FR8T1332 (exhaust)
Bosch Nickel Yttrium plugs (consumption)
Bosch Iridium plugs (exhaust)OEM P/N 5149050AB (consumption facet)
OEM P/N 5149888AA (exhaust facet)MSRP: $0.00 ea.0.40 in. hole (consumption)
0.50 in. hole (exhaust)??” attain, 5/8″ Hex head?Torque to twenty Ft. lbs.

CAUTION: This engine makes use of TWO DIFFERENT varieties of spark plugs. A complete of 16 plugs is used. The plugs are mounted in two rows (banks). The higher row is used on the consumption valve facet of the cylinder head. The decrease row is used on the exhaust valve facet of the cylinder head. The higher row makes use of Bosch Nickel Yttrium plugs. The decrease row makes use of Bosch Iridium plugs. DO NOT INTERCHANGE THESE PLUGS.

 

Torque (SAE internet) 235 LB-FT @ 4000 RPM 295 LB-FT @ 3200 RPM 334 LB-FT @ 3950 RPM
Valve system Chain-driven SOHC, 12 valves and hydraulic end-pivot curler rockers Chain-driven SOHC, 16 valves, hydraulic end-pivot curler rockers Chain-driven SOHC, 16 valves, hydraulic end-pivot curler rockers
Valve carry (zero lash) Intake 12.00 mm (0.472 in.)
Exhaust 12.00 mm (0.472 in.)
Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)
Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)
Valve springs
(consumption and exhaust except famous)
7.30 coils (consumption)
7.15 coils (exhaust)
6.69 coils
4.28 mm wire diameter
7.30 coils
4.60 mm x 3.67 mm wire diameter
Cylinder Block and so forth.
Camshaft Bore Diameter
26.02-26.04 mm
(1.0245-1.0252 in.)Bearing Journal Diameter
25.975-25.995 mm
(1.0227-1.0235 in.)Bearing Clearance
0.025-0.065 mm
(0.001-0.0026 in.)End Play (MAX)
.200 mm
(0.0079 in.)
Bore Diameter
26.02 – 26.04 mm
(1.0245 – 1.0252 in.)Bearing Journal Diameter
25.975 – 25.995 mm
(1.0227 – 1.0235 in.)Bearing Clearance
0.025 – 0.065 mm
(0.001 – 0.0026 in.)End Play
.075 – .200 mm
(0.003 – 0.0079 in.)
Bore Diameter
26.02 – 26.04 mm
(1.0245 – 1.0252 in.)Bearing Journal Diameter
25.973 – 25.995 mm
(1.0227 – 1.0235 in.)Bearing Clearance
0.025 – 0.065 mm
(0.001 – 0.0026 in.)End Play
.075 – .200 mm
(0.003 – 0.0079 in.)
Crankshaft Out of Round
0.005 mm
(0.0002 in.)End Play
0.052 – 0.282 mm
(0.0021 – 0.0112 in.)Bearing Clearance
0.006 – 0.044
(0.0002 – 0.0011 in.)Taper (max.)
0.006 mm
(0.0004 in.)
Out of Round (max.)
0.005 mm
(0.0004 in.)End Play
0.052 – 0.282 mm
(0.0021 – 0.0112 in.)Bearing Clearance
0.004 – 0.034 mm
(0.0002 – 0.0013 in.)Taper (max.)
0.008 mm
(0.0004 in.)
Out of Round (max.)
0.005 mm
(0.0004 in.)End Play
0.052 – 0.282 mm
(0.0021 – 0.0112 in.)Bearing Clearance
0.004 – 0.034 mm
(0.0002 – 0.0013 in.)Taper (max.)
0.008 mm
(0.0004 in.)
Cylinder Block Cast-iron block and bedplate
Aluminum alloy heads
Cast-iron block
Aluminum alloy heads
Cast-iron block
Aluminum alloy heads
Main bearings Journal diameter
63.488 – 63.512 mm
(2.4996 – 2.5005 in.)
Journal diameter
63.488 – 63.512mm
(2.4996 – 2.5005 in.)Bi-metal development
Journal diameter
63.488 – 63.512mm
(2.4996 – 2.5005 in.)Bi-metal development
Pistons
Diameter 92.975 mm (3.6605 in.) 92.975 mm (3.6606 in.) 92.975 mm (3.6605 in.)
Material Aluminum Alloy Aluminum Alloy
Weight 365.0 grams (12.87 oz.) 367.5 grams (12.96 oz.) 366.0 grams (12.90 oz.)
Piston Pins
Clearance in Piston 0.006 – 0.015 mm
(0.0002 – 0.0005 in.)
0.010 – 0.019 mm
(0.0004 – 0.0008 in.)
0.010 – 0.019 mm
(0.0004 – 0.0008 in.)
Diameter 24.017 – 24.020 mm
0.9455 – 0.9456 in.)
24.017 – 24.020 mm
(0.9455 – 0.09456 in.)
24.013 – 24.016 mm
(0.9454 – 0.09455 in.)
Type Pressed Fit Pressed Fit
Valve Timing
Intake – Opens (ATDC) 4.4° 4.4°
Intake – Closes (ATDC) 240.1° 239.1° 239.1°
Intake – Duration 245.7° 243.5° 243.5°
Exhaust – Opens (BTDC) 241.5° 240.5° 240.5°
Exhaust – Closes (ATDC) 20.1° 13.2° 13.2°
Exhaust – Duration 261.6° 253.70° 253.70°
Valve Overlap 25.7° 17.6° 17.6°
Top pace
3.7-L V-6 4.7-L V-8 4.7-L V-8 Gen II
0-60 mph 7.2
(Car & Driver)7.46
(Motor Trend)7.49
(AMSI, 1999 WJ)
0-62 mph (0-100 km/h) 9.0
(DaimlerChrysler)
1/4 mile / pace 15.6 / 86.0 mph
(Car & Driver)15.74 / 85.4 mph
(Motor Trend)15.46 /   ?  mph
(AMSI, 99 WJ)15.93 / 84.3 mph
(Private proprietor “Doanlaw”, 99 WJ)
Top pace (w/ limiter) 114 mph
Top pace (w/o limiter) 124 mph
(DaimlerChrysler)
Curve charts
 

3.7-Liter V6

4.7-Liter V8

 

 

WK engine specs Part II

3.0L CRD     5.7L HEMI’s    6.1L HEMI

 

 

 

 

 

 

 

 

Description 3.0L CRD 5.7L V8 (2005-2008) Gen I


5.7L V8 (2009-2010) Gen II

6.1L V8 HEMI
General
Air cleaner aspect / Intake system Dry Filter with Turbocharger and Charge Air Cooler Low restriction air consumption system Low restriction air consumption system
Bore x stroke 83 mm(3.26 in.)
92.0mm (3.62 in.)
99.5mm (3.92 in.)
90.9mm (3.58 in.)
103mm (4.06 in.)
90.9mm (3.58 in.)
Coolant capability 14.0 qt. (13.30-liters) 14.5 qt. (13.72-liters) 14.0 qt. (13.25-liters)
Compression Ratio 18.0:1 9.6:1


10.5:1

10.3:1
Displacement 3.0 Liters / 182 C.I. 5.7 Liters / 345 C.I. 6.1 Liters / 370 C.I.
Engine sort CRD 90° V-8 HEMI 90° V-8 HEMI
Engine pace, most 5800 RPM 6400 RPM
Engine pace, tachometer redline
Firing Order 1-4-2-5-3-6 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2
Fuel requirement Diesel Mid-grade 89 octaneAcceptable:
Regular grade, 87 octanePremium is NOT really helpful
Premium 91 octane (R+M)/2 really helpful
Injectors stream = 22.5 lb/hr @ 49psi
Knock sensor(s) Two (Stereo) Two (Stereo)
Lead Cylinder # 1 Left Bank # 1 Left Bank # 1 Left Bank
Oil Capacity 10 quarts 7 Quarts(Note: 5W-20 oil MUST be used for correct operation of MDS system) 7 Quarts0W-40 (API rated SL/CF full artificial engine oil resembling Mobile 1)
Oil stress At curb idle: 16 psi
@3200 rpm: 52 psi
At curb idle: 04 psi minimal
@3000 rpm: 25-110 psi
At curb idle: 04 psi minimal
@3000 rpm: 25-110 psi
Power (SAE internet) 215 BHP @ 4200 RPM 325-330 BHP @ 5000 RPM


357 BHP @ 5200 RPM

420 BHP @ 6200 RPM
Spark plugs P/N SPRE14MCC4
MSRP: $3.25Type: RE14MCC40.45 in. hole
1″ attain, 5/8″ Hex head
Torque to 12-14 Ft. Lbs.

(*NOTE: The 5.7L V-8 is supplied with torque crucial tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)

 


P/N SLZFR5C11G
MSRP: $0.00

Type: LZFR5C11G4

0.43 in. hole
1″ attain, 5/8″ Hex head
Torque to 12-14 Ft. Lbs.

(*NOTE: The 5.7L Gen II V-8 is supplied with torque crucial tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)

P/N SPLZTR5A13
MSRP: $0.00Type: LZTR5A130.50 in. hole
1″ attain, 5/8″ Hex head
Torque to 12-14 Ft. Lbs.

(*NOTE: The 6.1L V-8 is supplied with torque crucial tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)

Torque (SAE internet) 376 LB-FT @ 1800 RPM 370-375 LB-FT @ 3500 RPM


389 LB-FT @ 4350 RPM

420 LB-FT @ 4800 RPM
Weight, engine 474 Lbs. (215 Kg)
Cylinder Block and so forth.
Camshaft Chain Driven Dual Overhead Camshafts End play
.080 – 0.290mm
(0.0031 – 0.0114 in.)Type
Hollow Assembled
End play
.080 – 0.290mm
(0.0031 – 0.0114 in.)Type
Hollow Assembled
Crankshaft Out of spherical
0.005 mm
(0.0002 in.)End play
0.052 – 0.282 mm
(0.002 – 0.011 in.)Bearing Clearance
0.020 – 0.060 mm
(mm 0.0007 – 0.0023 in.)Taper (max.)
0.003 mm
(0.0001 in.)Material
Nodular iron
Out of spherical
0.005 mm
(0.0002 in.)End play
0.052 – 0.282 mm
(0.002 – 0.011 in.)Bearing Clearance
0.023 – 0.051 mm
(0.0009 – 0.002 in.)Taper (max.)
0.003 mm
(0.0001 in.)Material
Nodular iron
Cylinder Block Deep-skirt cast-iron block with cross-bolted principal bearing caps
Aluminum alloy heads with hemispherical combustion chambers.
Deep-skirt cast-iron block with cross-bolted principal bearing caps
Aluminum alloy heads with hemispherical combustion chambers
Main bearings Journal diameter
64.988 – 65.012 mm
(2.5585 – 2.5595 in.)
Journal diameter
64.988 – 65.012 mm
(2.5585 – 2.5595 in.)
Hydraulic tappets
Body diameter 21.387 – 21.405 mm
(0.8420 -0.8427 in.)
21.387 – 21.405 mm
(0.8420 -0.8427 in.)
Clearance (to bore) 0.020 – 0.063 mm
(0.0007 – 0.0024 in.)


0.020 – 0.063 mm
(0.0008 – 0.0025 in.)

0.020 – 0.063 mm
(0.0007 – 0.0024 in.)
Dry lash 3.0 mm on the valve
(0.1181 in. on the valve)
3.0 mm on the valve
(0.1181 in. on the valve)
Pistons
Diameter 82.833 (82.839 mm)
Material Aluminum Alloy Aluminum Alloy
Weight 413 grams (14.56 oz.) 435 grams (15.34 oz.)
Piston Pins
Clearance in Piston 0.009 – 0.018 mm
(0.00035 – 0.0007 in.)
0.006 – 0.015 mm
(0.00023 – 0.00059 in.)
Diameter 24.0 – 24.003 mm
(0.9448 – 0.9449 in.)
25.0 – 25.003 mm
(0.9843 – 0.9844 in.)
Valves
Valve system Pushrod-operated overhead valves, 16 valves, eight deactivating and eight typical hydraulic lifters, all with curler followers.


Variable-valve Timing (VVT), pushrod-operated overhead valves, 16 valves, eight deactivating and eight typical hydraulic lifters, all with curler followers.

Pushrod-operated overhead valves, 16 valves, eight typical hydraulic lifters, all with curler followers. Intake valves function hole stems and a pair of mm bigger heads in comparison with the 5.7L engine, permitting extra air stream.
Valve carry (zero lash) Intake 12.00 mm (0.472 in.)
Exhaust 11.70 mm (0.460 in.)
Intake 14.50 mm (0.571 in.)
Exhaust 14.00 mm (0.551 in.)
Valve springs
(consumption and exhaust except famous)
7.4 coils
5.39 × 4.52 mm wire diameter


7.95 coils
4.95 × 4.1 mm wire diameter

VALVE SPRING NOTE:
5.7L Hemi engines constructed after 1/17/2010 are geared up with a brand new “damper-less” valve spring design. The new springs are used with out the decrease spring damper/assist on each consumption and exhaust valves. The new spring comes with a brand new valve spring seat which must be changed if changing 2009 or newer engine to the damper-less design.
These new valve springs CANNOT be used as substitute springs on the older mannequin 12 months (2003-2008) 5.7L Hemi engines. The new springs have a larger put in top and can trigger diminished open and closed spring pressure. Early-built Eagle Hemi engines (1/17/2010 – 1/28/10) could have a yellow paint stripe on the springs, just like the dampened older spring. The new damper-less spring can be 5mm taller than the previous spring when measured in free size. Production springs after 1/28/10 ought to have a pink-to-light purple paint stripe.

7.35 coils
5.65 × 4.51 mm wire diameter

Premium valve springs with exterior dampers improve the valvetrain and allow larger engine pace operation to six,400 rpm

Valve Timing
Intake – Opens (BTDC) 5.0°


21.7°

15.0°
Intake – Closes (ATDC) 253.0°


255.0°

268.0°
Intake – Duration 258°


269.3°

283.0°
Exhaust – Opens (BTDC) 233.0°


236°

251.0°
Exhaust – Closes (ATDC) 27.0°


32.0°

35.0°
Exhaust – Duration 253.7°


269.0°

286.0°
Valve Overlap 34.0°


39.5°

50.0°
Top pace
3.0-L V-6 5.7-L V-8 6.1-L V-8 HEMI
0-60 mph 4.7 sec.
1/4 mile / pace 13.5 sec.
Top pace (w/ limiter)   165 mph
Top pace (w/o limiter) 165 mph

 

 

About the HEMI Multi-Displacement System:
Chrysler Group was the primary to supply trendy, large-volume autos in North America with cylinder deactivation – the HEMI-powered 2005 Chrysler 300C and Dodge Magnum R/T went on sale within the of spring 2004 with the Chrysler Group Multi-Displacement System, or MDS. Chrysler Group was additionally the primary to supply cylinder deactivation in an SUV with the introduction of MDS within the 2005 HEMI-powered Jeep® Grand Cherokee. Chrysler Group is the primary to supply MDS in a pickup truck – the 2006 Dodge Ram 1500.

The Chrysler Group MDS is customary gear with the 5.7L HEMI on seven autos: the Chrysler 300C, Dodge Charger R/T, Durango, Magnum R/T, Ram 1500 and Jeep Grand Cherokee and Commander.

With the addition of MDS to HEMI-equipped Dodge Durango and Ram, MDS-equipped autos by way of the top of the 2007 mannequin 12 months will save greater than 60 million gallons of gasoline annually.

The Chrysler Group MDS (Multi-Displacement System) seamlessly alternates between easy, excessive gasoline economic system four-cylinder mode when much less energy is required, and V-8 mode when extra energy from the 5.7L HEMI® engine is in demand,” mentioned Eric Ridenour, Executive Vice President Product Development, Chrysler Group. “This optimizes gasoline economic system when V-8 energy will not be wanted, with out sacrificing automobile efficiency.

The MDS was a part of the engine’s unique design,” mentioned Bob Lee, Vice President Powertrain Product Team, Chrysler Group. “This resulted in a cylinder-deactivation system that’s elegantly easy and utterly built-in into the engine design. The advantages are fewer elements, most reliability and decrease value.

Some of the numerous applied sciences enabling the Chrysler Group MDS are the pace of digital controls, the sophistication of the algorithms controlling the programs and using Electronic Throttle Control. The HEMI will have the ability to transition from eight cylinders to 4 in 40 milliseconds (0.040 seconds).

The HEMI engine with MDS has accomplished over 6.5 million customer- equal miles by way of Chrysler Group’s growth and sturdiness testing. It is roofed by the 7-Year/70,000-mile Limited Powertrain guarantee.

The system deactivates the valve lifters. This retains the valves in 4 cylinders closed, and there’s no combustion. In addition to stopping combustion, power will not be misplaced by pumping air by way of these cylinders. For correct operation, 5w-20 oil have to be utilized in engines with the MDS function. Failure to take action could end in improper operation of the Multiple Displacement System.

Customers will expertise estimated gasoline economic system positive factors of as much as 20 p.c below numerous driving circumstances, and a projected 10 p.c combination enchancment. Improved gasoline economic system is realized with none change in buyer expertise — drivers will obtain the profit with out altering their driving habits and with out compromising type, consolation or comfort.

MDS parts and operation

The Multiple Displacement System (MDS) supplies cylinder deactivation throughout regular pace, low acceleration and shallow grade climbing circumstances to extend gasoline economic system. Both 4 and eight cylinder configurations have even firing intervals providesmooth operation. Two cylinders on every financial institution are energetic when the engine is in four-cylinder mode – each different cylinder within the firing order. All of the cylinders which are deactivated have distinctive hydraulic valve lifters that collapse when deactivated to stop the valves from opening. Engine oil stress is used to activate and deactivate the valves. It is delivered by way of particular oil passages drilled into the cylinder block. Solenoid valves management the stream. When activated, pressurized oil pushes a latching pin on every valve lifter, which then turns into a “misplaced movement” hyperlink. Its base follows the camshaft, however its prime stays stationary, held in place towards the pushrod by gentle spring stress however unable to maneuver due to the a lot larger pressure of the valve spring.

Deactivation happens in the course of the compression stroke of every cylinder, after air and gasoline enter the cylinder. Ignition then happens, however the combustion merchandise stay trapped within the cylinder below excessive stress, as a result of the valves not open. No air enters or leaves. During subsequent piston strokes, this high-pressure fuel is repeatedly compressed and expanded like an air spring, however gasoline will not be injected.

The Multi Displacement System selectively deactivates cylinders 1,4,6, and seven, to enhance gasoline economic system. It has two modes of operation:

 

  • 8 cylinders for acceleraton and heavy masses.
  • 4 cylinders for cruising and metropolis site visitors.

The principal parts of the Multi Displacement System are:

  • Unique MDS camshaft.
  • Deactivating curler tappets.
  • 4 management valves/solenoids.
  • management valve/solenoid wiring harness.
  • oil temp sensor.

 

NOTE: Vehicles with the 5.7L Multiple Displacement System should use SAE 5W-20 oil. Failure to take action could end in improper operation of the Multiple Displacement System.

The MDS system is designed to function at speeds from round 20 mph to 80 mph. Some homeowners have reported activation at accelerates in direction of 90 mph. As proven within the chart beneath, the responsibility cycle is extra energetic at freeway speeds and on degree floor. Other parameters that homeowners have found is that the engine working temperature have to be not less than 130 levels and oil stress above 45 psi. In addition, the transmission have to be in fifth gear at speeds above 35-40 mph.

MDS “activation lights” have been added by some homeowners. This includes wiring up a small gentle and change to the No. 4 cylinder MDS solenoid energy wire on the PCM pin # 28. While some folks can decide the purpose when MDS is engaged or disengaged by the sound of the exhaust (extra notably on aftermarket exhaust programs), the sunshine supplies extra exacting outcomes as to when the MDS system is on or off.

Cylinder Deactivation

 

  • Trap an exhaust cost
  • Normal combustion occasion
  • Don’t open exhaust valve
  • Don’t open consumption valve
  • Piston is an air spring
  • Cylinders deactivated in firing sequence

Cylinder Reactivation

 

  • Empty the cylinder
  • Open exhaust valve
  • Open consumption valve
  • Normal combustion occasion
  • Cylinders reactivated in firing sequence

 

 

Duty cycle: MDS was engaged for about 17% of metropolis driving and 48% freeway for an general common of 40%
Maximizing MPG with MDS

Just a couple of easy suggestions may help homeowners of Chrysler Group engines with Multi-Displacement System (MDS) get probably the most gasoline mileage doable from their 5.7L HEMI® V8 engine.

The buyer doesn’t must drive in a sure solution to understand a gasoline economic system enchancment with MDS, however these driving habits can maximize their gasoline financial savings with this know-how.

 

  • Keeping speeds to 65 mph or beneath – MDS makes use of 4 cylinder mode most at these speeds
  • Use cruise management – this helps keep a gentle pace, typically permitting the HEMI to run on 4 cylinders for longer intervals
  • Accelerate extra steadily – the HEMI will present V8 energy each time it’s requested by the motive force
  • Use a gentle throttle each time doable – this maximizes 4 cylinder mode

 

 

See also  Jeep WK Grand Cherokee Maintenance and Service Menu

Leave a Comment