Welcome to the JeepSpecs.com in-depth page on WJ Generation Jeep Grand Cherokee engine specification Guide. We have organized as much information as we could find into a helpful article below. Is something incorrect or missing? Please get in touch with us and we’ll fix it!
| 4.0 liter I-6 | 4.7 liter V-8 | 4.7 liter V-8 High Output |
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Jeep has used three different engines for the WJ series (plus a couple of 5-cylinder diesels for the export market):
4.0 liter I-6 (242 cu in., 195 bhp)
The standard in-line 6 cylinder engine was significantly reengineered in 1999. Upgrades included new cylinder heads with reduced-area exhaust ports, new exhaust manifolds, a new 50% more efficient slitter-vane water pump that added two horsepower, a new elastomer-coated steel intake manifold gasket, a two-piece high silicon-molybdenum alloy cast-iron exhaust manifold, automated belt tensioner and a new laminated oil pan. These refinements added more power (10 bhp), a 5db quieter operation with an enhanced lower “throaty” sound quality, and cleaner emissions.
For comprehensive 4.0 perfomance information and specifications, visit Dino’s JEEP 4.0 performance site.4.7 liter
V-8 (287 cu in., 235 bhp)
The all-new 4.7-liter V-8 engine offers more power, less weight (438 lbs), increased fuel efficiency and lower emissions than the 5.2-liter engine it replaced. An incredibly detailed tech analysis, written by Richard Ehrenberg in 1999, can be found here: Chrysler’s New Cammer.
4.7 liter V-8 HO (287 cu in., 265 bhp)
A High Output version of the 4.7L was introduced starting with the 2002 model year. The performance modifications added 30 horsepower and 30 Ft.-Lb. of additional torque. The HO engine is designed to run perfectly on standard octane fuel, but for maximum performance premium fuel is recommended.
The HO engine is standard on all 2002-2004 Overland models, and is optional on the 2002-2004 Limited 4WD models. In the 2004 model year, Jeep offered the HO as an option on three special models, the Freedom, Columbia and Rocky Mountain editions. It has not been available on the Laredo, Laredo Sport or SE (Special Edition) models. All 2002 models with the HO engine featured a nice custom chrome exhaust tip. This was, unfortunately, decontented starting with 2003 model year production.
WJ Engine specifications |
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| Description | 4.0L I-6 | 4.7L V8 | 4.7L V8 HO | ||
| General | |||||
| Air cleaner element / Intake system | Air filter Mopar® P/N 53007386 (standard air intake system) |
Air filter Mopar® P/N 53007386 (standard air intake system) |
Low restriction air intake system:Air filter Mopar® P/N 5015610AA superceded by: P/N 5015610ABAir cleaner hose Mopar® P/N 53013418AALower air cleaner housing Mopar® P/N 501832AAUpper air cleaner housing Mopar® P/N 5018321AAResonator Mopar® P/N 53013417AA(low-restriction air intake system) |
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| Bore x stroke | 98.4 mm (3.88 in.) 86.69 mm (3.413 in.) |
93.0 mm (3.66 in.) 86.5mm (3.405 in.)Bore/Stroke ratio: 1.08 Rod/Stroke Ratio: 1.80 |
93.0 mm (3.66 in.) 86.5mm (3.40 in.) |
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| Displacement | 4.0 Liters / 242 C.I. | 4.7 Liters / 287 C.I. | 4.7 Liters / 287 C.I. | ||
| Engine type | In-line 6 cylinder | 90° SOHC V-8 16-Valve | 90° SOHC V-8 16-Valve | ||
| Engine speed, maximum | 5300 RPM | 6000 RPM | 6000 RPM | ||
| Engine speed, tachometer redline | 5300 RPM | 5300 RPM | 5700 RPM | ||
| Compression Ratio | 8.8:1 | 9.0:1 | 9.7:1 | ||
| Fuel Economy mpg (EPA est., City/Hwy) | 2WD — 15/214WD — 15/20 | 14/19 | 14/19 | ||
| Fuel requirement | Regular unleaded, 87 octane | Regular unleaded, 87 octane | Regular unleaded, 87 octaneRecommended for maximum performance: Unleaded premium, 93 octane |
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| Firing Order | 1-5-3-6-2-4 | 1-8-4-3-6-5-7-2 | 1-8-4-3-6-5-7-2 | ||
| Injectors | Flow=22.5 lb/hr @ 49psi | Flow = 22.5 lb/hr @ 49psi | Flow = 25.8 lb/hr @ 49psi | ||
| Knock sensor(s) | (none) | (none) | Two (Stereo)(located under intake manifold, one bolted on each side) | ||
| Lead Cylinder | # 1 | # 1 Left Bank | # 1 Left Bank | ||
| Oil Capacity | 6 Quarts | 6 Quarts | 6 Quarts | ||
| Oil pressure | At curb idle: 13 psi minimum @1600 rpm & above: 37-75 psi |
At curb idle: 07 psi minimum @3000 rpm: 35-105 psi |
At curb idle: 04 psi minimum @3000 rpm: 25-110 psi |
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| Power (SAE net) | 195 BHP @ 4600 RPM | 235 BHP @ 4800 RPM | 265-270 BHP @ 5100 RPM | ||
| Powertrain Control Module (PCM) | P/N 56041833AE (2002) After 10/21/01 P/N 56044357AA California: P/N 56041835AEP/N 56044632AB (2003)P/N 56044563AB (2004) |
P/N 56044810AB (2002)P/N 56044630AB (2003)
P/N 56044564AB (2004) |
P/N 56044811AB (2002)P/N 56044631AB (2003)
P/N 56044565AB (2004) |
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| Spark plugsSee also: WJ spark plugs |
Standard resistor-typeP/N SP0RC12ECC (formerly 56041402AB)Type: RC12ECC 0.035 in. gap |
“Fired in suppressor seal” type spark plugs using a copper core ground electrode.P/N SPRC12MCC4 (formerly 56028236AA)Type: RC12MCC4 0.040 in. gap |
Unique platinum-tipped spark plugs(Featuring a platinum rivet located on the tip of the center electrode)P/N SPRC7PYCB4Type: RC7PYCB4 0.040 in. gap
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| Throttle Body | 60mm necked to 56mm | 65mm (1999-2000) 68mm (2002-2004) |
68mm | ||
| Torque (SAE net) | 230 LB-FT @ 3000 RPM | 295 LB-FT @ 3200 RPM | 325-330 LB-FT @ 3600 RPM | ||
| Valve system | OHV, 12 valves, flat followers, hydraulic lifters | Chain-driven SOHC, 16 valvesHydraulic end-pivot roller rockers
Flash-chromed stems, hardened tips 1.89″ diameter intake |
Unique exhaust valvesChain-driven SOHC, 16 valves, hydraulic end-pivot roller rockers | ||
| Valve lift (zero lash) | Intake 10.35 mm (0.4075 in.) Exhaust 10.528 mm (0.4145 in.) |
Intake 11.25 mm (0.4430 in.) Exhaust 10.90 mm (0.4292 in.) |
Intake 12.0 mm (0.4724 in.) Exhaust 10.90 mm (0.4292 in.) |
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| Valve springs (intake and exhaust) |
? | 6.69 coils 4.28 wire diameter |
7.30 coils 4.77 wire diameter |
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| Weight, engine | ? | 438 Lbs. | ? | ||
Cylinder Block etc. |
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| Camshaft | 53010448AA (1999-2004) | Hollow steel tubes with individual lobes, powdered metal, sinter-bonded in place.53021159AA (left, 1999-2002) 53021160AA (right, 1999-2002)53021159AC (left, 2003-2004) 53021160AC (right, 2003-2004) |
53021411AB (left, 2002-2004) 53021412AB (right, 2002-2004) |
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| Crankshaft | Nodular cast iron | Nodular cast ironCross drilled, radiused, hardened, microfinished, fully counterbalanced, 5 main bearings
2.5″ diameter crossdrilled main journals, rolled fillets 2.0″ rod journals, rolled fillets Balance: > 18 gm/cm |
Forged steel P/N 53021409AA | ||
| Cylinder Block | Cast-iron block and head | Cast-iron block with removable bedplateAluminum alloy heads
Near hemispherical combustion chambers |
Cast-iron block with modified aluminum alloy headsDetonation sensor bosses in the valley | ||
| Main bearings | ? | Bi-metal construction | Tri-metal construction | ||
| Manifold, Intake | P/N 4854197AA (1999-2002)P/N 4854197AB (2003-2004) | Glass filled nylon, single plenum, ram’s horn runners20″ runner length
Single bore throttle body P/N 53030951 (1999) |
Modified (shorter runners)
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| Out of Round (max.) | 0.025 mm (0.001 in.) | 0.076 mm (0.003 in.) | 0.076 mm (0.003 in.) | ||
| Taper (maximum) | 0.025 mm (0.001 in.) | 0.051 mm (0.002 in.) | 0.051 mm (0.002 in.) | ||
Pistons |
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| Diameter | ? | 92.975 mm (3.6606 in.) | 92.975 mm (3.6606 in.) | ||
| Material | Aluminum Alloy | Aluminum Alloy6.12″ powdered forged metal connecting rods, cracked caps
Moly coated skirts for break-in scuff resistance |
Aluminum AlloySymmetric pop-up design (for improved compression)Modified connecting rods (Serviced as one-piece with piston) |
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| Weight | 417 – 429 grams (14.7 – 15.1 oz.) | 367.5 grams (12.96 oz.) | 383.5 grams (13.52 oz.) | ||
| Piston Pins | |||||
| Clearance in Piston | 0.0102 – 0.0208 mm (0.00005 – 0.00009 in.) |
0.010 – 0.019 mm (0.0004 – 0.0008 in.) |
0.010 – 0.019 mm (0.0004 – 0.0008 in.) |
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| Diameter | 23.650 – 23.658 mm (0.9306 – 0.09307 in.) |
24.017 – 24.020 mm (0.9455 – 0.09456 in.) |
24.017 – 24.020 mm (0.9455 – 0.09456 in.) |
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| Type | Pressed Fit | Pressed Fit | Full floating | ||
Valve Timing |
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| Intake – Opens (ATDC) | 12.4° (BTDC) | 4.4° | 3.0° | ||
| Intake – Closes (ATDC) | 60.9° (ABDC) | 239.1° | 233.0° | ||
| Intake – Duration | 253.3° | 243.5° | 236.0° | ||
| Exhaust – Opens (BTDC) | 49.8° (BBDC) | 240.5° | 235.0° | ||
| Exhaust – Closes (ATDC) | 29.2° | 13.2° | 15.0° | ||
| Exhaust – Duration | 259° | 253.70° | 250.0° | ||
| Valve Overlap | 41.6° | 17.6° | 18.0° | ||
Top speed and Elapsed Times |
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| I-6 | V8 | V8 H.O. | |||
| 0-60 mph | 9.5 (Auto Channel)10.9 (Alasta Autos)10.1 (Consumer Reports ’01 Laredo) |
7.2 (Car & Driver)7.46 (Motor Trend)7.49 (AMSI, 1999 WJ) |
6.9 (Motor Trend)6.7 (MotorWeek, ’02 Overland) PDF file of road test |
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| 0-62 mph (0-100 km/h) | 10.9 (DaimlerChrysler) |
9.0 (DaimlerChrysler) |
8.3 (DaimlerChrysler) |
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| 1/4 mile / speed | 17.8 / 78 mph (Consumer Reports ’01 Laredo) |
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 owner “Doanlaw”, 99 WJ) |
15.4 / 86.6 mph (Motor Trend)15.2 / 88.0 mph (Motorweek, ’02 Overland) PDF file of road test15.61 / 86.0 mph (Private owner “RobG”) |
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| Top speed (w/ limiter) | 105 mph (estimated) |
114 mph | 118 mph (Private owners, several) |
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| Top speed (w/o limiter) | 118 mph (DaimlerChrysler) |
124 mph (DaimlerChrysler) |
128 mph (DaimlerChrysler) |
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Curve charts |
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| 4.0 liter I-6 | 4.7 liter V-8 | 4.7-Liter V8 HO |
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Magnum Hemi® 5.7L V8
Features & Specifications
The 5.7-liter V-8, which puts out 325 horsepower with 390 lb.-ft of torque, debuts for model year 2005 in the all-new Grand Cheokee. As described by DC, “The engine’s unique two-valve Hemispherical combustion chamber (which gives the engine its “Hemi” name) within an aluminum head provides impressive air flow, torque and power, and gives the engine its throaty rumble. The engine started production at the Salitillo plant in Mexico in June of 2002. More than 35,000 engines per month have been rolling off the assembly lines. The engines will be used in pickups, Dakotas, Durangos, Grand Cherokees and other large Chrysler vehicles like the 300 series.
The Hemi engine in the Grand Cherokee includes Cylinder Deactivation, a feature which shuts down four of the eight cylinders during idling and light-demand situations, such as highway driving, by electronically controlling the flow of oil to valve lifters. Engines with this enhanced fuel-saving multi-displacement feature started production in January of 2004.
Facts and features:
The 5.7-liter Hemi® Magnum V-8 engine is an internally balanced pushrod (OHV) 90-degree V-8. The cast iron block is a deep skirt and cross-bolted design with cylinder bore spacing the same as the engine it replaces.
The aluminum cylinder features a two-valve per-cylinder, Hemispherical combustion chamber with dual spark plugs and a coil over plug ignition for best-in-class airflow and power. 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 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.
Three different views of the Hemi engine.
Grand Cherokee 5.7L Hemi Specifications
- Description: Eight cylinders, 90-degree V-type, liquid cooled. Deep-skirt cast iron block with cross-bolted main bearing caps, aluminum alloy heads with Hemispherical combustion chamber
- Bore x stroke: 3.92 x 3.58 (99.5 x 90.9)
- Camshaft: Silent chain, 5-bearings. Bi-metal material except number 3 Babbit. Deep-fillet rolled journals for improved fatigue life, press fit damper to minimize torsional vibration
- Compression Ratio: 9.6:1
- Connecting rods: Forged with cracked cap, powder metal, bi-metal bearings
- Crankshaft: Nodular cast iron, tuned assembly vibration damper, 6 bi-metal bearings
- Displacement: 354 CID (5,654 cu. cm)
- Engine speed, max: 5,800 rpm
- Fuel injection: Sequential, multi-port, electronic, returnless
- Fuel requirement: Unleaded mid-grade, 89 octane (R+M)/2 – recommended, Unleaded regular, 87 octane (R+M)/2 – acceptable. Premium is not recommended.
- Knock sensors: Dual, wide band
- Manifold, intake: Seven-piece composite construction with electronic throttle control
- Oil capacity: 7 qt. (6.6L)
- Pistons: Aluminum strutless, 3-ring
- Piston pins: Floating in piston, press-fit in rod
- Power (2500 series): (SAE net) 330 bhp @ 5100 rpm
- Torque: (SAE Net) 375 lb.-ft @ 3500 rpm
- Valve system: Pushrod-operated overhead valves, 16 valves, hydraulic lifters with roller followers
- Valves, intake: SAE 547 steel, solid stem, PMF-22 seats
- Valves, exhaust: 23-8N steel, solid stem, PMF-22 seats