The Chrysler PowerTech 4.7 L (also known as Dodge 4.7L Magnum) is a 4.7 l (4,701 cc, 287.0 cu.in.) natural aspirated V8 90° four-stroke gasoline engine manufactured by Chrysler in Detroit, Michigan, USA from 1999 to 2013. The PowerTech 4.7 L was on the Ward’s 10 Best Engines list for 1999.
The Chrysler PowerTech 4.7 L features a cast-iron block and two aluminum cylinder heads with a single camshaft (SOHC) and two valves per cylinder (16 valves in total). The Chrysler 4.7L PowerTech/Magnum engine is equipped with a sequential multiport fuel injection system and an electronic ignition system with a separate ignition coil for each cylinder.
The compression ratio rating is 9.0:1, 9.7:1 for HO (High-Output) version, 9.8:1 after 2008. The cylinder bore and the piston stroke are 93.0 mm (3.66 in) and 86.5 mm (3.41 in), respectively. This engine produces 238 PS (175 kW; 235 HP) at 4,800 rpm of horsepower and 400 N·m (40.8 kg·m, 294.8 ft·lb) at 3,200 rpm of maximum torque.
In 2002, Chrysler introduced a “High-Output” version of the PowerTech 4.7L engine. This engine produced 269 PS (198 KW; 265 HP) at 4,800 rpm of output power and 447 Nm (45.59 kg·m; 329.89 ft·lb) at 3,200 rpm of peak torque. This version was available for Jeep Grand Cherokee Overland as a standard engine and for Jeep Grand Cherokee Limited as an option. The Chrysler 4.7L V8 HO engine used high-compression domed pistons (the compression ratio rating is 9.7:1), new camshafts, tuned intake, and two knock sensors.
General information
| Engine Specifications | |
| Engine model | Chrysler PowerTech 4.7L (Dodge 4.7L Magnum) |
| Layout | Four stroke, V8 |
| Fuel type | Gasoline (petrol) |
| Production | 1999-2013 |
| Displacement | 4.7 L, 4,701 cc (287.0 cu in) |
| Fuel system | Sequential Multiport Fuel Injection |
| Power adder | None |
| Power output |
238 PS (175 kW; 235 HP) at 4,800 rpm High-Output: 269 PS (198 KW; 265 HP) at 4,800 rpm |
| Torque output |
400 N·m (40.8 kg·m, 294.8 ft·lb) at 3,200 rpm High-Output: 447 Nm (45.59 kg·m; 329.89 ft·lb) at 3,200 rpm |
| Firing order | 1-8-4-3-6-5-7-2 |
| Dimensions (L x W x H): | – |
Cylinder block
The PowerTech 4.7L engine has a cast-iron block with a five-bearings crankshaft supported system. The cylinder bore is 93.0 mm (3.66 in), piston stroke is 86.5 mm (3.41 in). This motor has aluminum alloy pistons with two compression and one oil control rings, forged steel connecting rods, and nodular iron crankshaft. The crankshaft main journal diameter is 63.5 mm (2.5 in) and the crankpin diameter is 51.0 mm (2.00 in). The crankshaft is a cross-shaped four throw design with eight counterweights for balancing purposes.
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: |
9.0:1 High-Output: 9.7:1 2008 and later: 9.8:1 | |
| Cylinder bore: | 93.0 mm (3.66 in) | |
| Piston stroke: | 86.5 mm (3.41 in) | |
| Number of piston rings (compression / oil): | 2/1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 92.940-93.090 mm (3.659-3.665 in) | |
| Piston pin outer diameter: | 24.017-24.020 mm (0.9455-0.9457 in) | |
| Piston ring side clearance: | Top | 0.051-0.094 mm (0.002-0.0037 in) |
| Second | 0.040-0.080 mm (0.0016-0.0031 in) | |
| Oil | 0.019-0.229 mm (0.0007-0.009 in) | |
| Piston ring end gap: | Top | 0.200-0.360 mm (0.0079-0.0142 in) |
| Second | 0.370-0.630 mm (0.0146-0.0248 in) | |
| Oil | 0.250-0.760 mm (0.0098-0.0299 in) | |
| Crankshaft main journal diameter: | 63.488-63.512 mm (2.4995-2.5005 in) | |
| Crankpin diameter: | 50.992-51.008 mm (2.0076-2.0082 in) | |
Cylinder head
The cylinder heads are made of aluminum. The engine has a single overhead camshaft. The camshafts are driven by timing chains. The intake valve diameter is 48.65 mm (1.915 in), the duration is 243.5° the exhaust valve diameter is 37.0 mm (1.46 in), the duration is 253.70°. The Chrysler PowerTech 4.7L V8 engine is equipped with hydraulic lash adjusters.
| Cylinder head | ||
| Block head alloy | Aluminum | |
| Valve Arrangement: | SOHC, chain drive | |
| Head surface flatness | – | |
| Valves: | 16 (2 valves per cylinder) | |
| Intake valve timing | 243.5° | |
| Exhaust valve timing: | 253.7° | |
| Valve head diameter: | INTAKE | 48.520-48.780 mm (1.9102-1.9205 in) |
| EXHAUST | 36.870-37.130 mm (1.4516-1.4618 in) | |
| Valve length: | INTAKE | 113.450-114.210 mm (4.4665-4.4964 in) |
| EXHAUST | 114.920-115.68 mm (4.5244-4.5543 in) | |
| Valve stem diameter: | INTAKE | 6.931-6.957 mm (0.2729-0.2739 in) |
| EXHAUST | 6.902-6.928 mm (0.2717-0.2728 in) | |
| Valve spring free length: | INTAKE | 49.000 mm (1.9291 in) |
| EXHAUST | 49.000 mm (1.9291 in) | |
Maintenance data
| Oil system | |
| Recommended engine oil | SAE: SAE 5W-30 (SAE 5W-20 after 2007) |
| Oil type API | API: Diamler-Chrysler Mopar or equivalent |
| Engine oil capacity (Refill capacity) | 5.6 L (5.9 US. qt, 4.9 Imp. qt.) |
| Oil pressure |
Idle speed: 45 kPA, (7 psi) 3,000 rpm 240-725 kPA, (35-105 psi) |
| Ignition system | |
| Spark plug | NGK ZFR6F-11G |
| Spark plug gap | 1.1 mm (0.043 in) |
| Spark plug tightening torque | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Vehicle applications
| Model | Years Produced |
| Jeep Grand Cherokee | 1999–2009 |
| Dodge Dakota | 2000–2007 |
| Dodge Durango | 2000–2009 |
| Dodge Ram 1500 | 2002–2007 |
| Jeep Commander | 2006–2009 |
| Chrysler Aspen | 2007–2009 |
| Mitsubishi Raider | 2006–2007 |
| High-Output | |
| Jeep Grand Cherokee | 2002–2004 |
| Jeep Grand Cherokee | 2007–2008 |
| Dodge Dakota | 2007–2008 |
| Dodge Ram 1500/Ram 1500 | 2007–2008 |
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