Chrysler 5.2 L (318 CID) Magnum V8

Chrysler 318 MagnumThe Chrysler 318 Magnum is a 5.2 L (5,210 cc, 318 cu·in) natural aspirated V8 90° four-stroke liquid-cooled internal combustion gasoline engine, manufactured by Chrysler Corporation from 1992 to 2003.

A 99.3 mm (3.91 in) cylinder bore and 84.0 mm (3.31 in) piston stroke give the 5.2 L (318 cu in) Magnum V6 engine a total of 5,210 cm3 of displacement. The compression ratio rating is 9.1:1.

This engine produced 234 PS (172 kW; 230 HP) at 4,100 rpm of horsepower and 400 N·m (40.8 kg·m, 294.8 ft·lb) at 3,000 rpm of peak torque.

The Chrysler 318 Magnum V8 engine features:

  • Eight-cylinder V-type 90°
  • Cast-iron cylinder block and heads
  • Nodular iron crankshaft and camshaft
  • Aluminum alloy pistons with two compression and single oil ring
  • Forged steel connecting rons
  • OHV design with single camshaft
  • Electronic ignition system with mechanical distributor
  • Multiple-point fuel injection system

General information

Engine Specifications
Engine model 5.2 Magnum
Engine type 4-stroke, OHV, V8 90°
Displacement 5.2 L, 5,211 cm3, (318 cu·in)
Max. horsepower 234 PS (172 kW; 230 HP) at 4,100 rpm
Max. torque 400 N·m (40.8 kg·m, 294.8 ft·lb) at 3,000 rpm
Cooling system Liquid-cooled
Lubricating system Pressurized lubrication
Ignition system Electronic ignition system with mechanical distributor
Fuel system Multiple-point fuel injection system
Fuel used Unleaded gasoline (octane number 86 or higher)
Firing order: 1-8-4-3-6-5-7-2
Dimensions (L x W X H)
Dry weight

Cylinder Block and Head

Cylinder block
Cylinder block alloy: Cast-iron
Compression ratio: 9.1:1
Cylinder bore: 99.3 mm (3.91 in)
Piston stroke: 84.0 mm (3.31 in)
Cylinder internal diameter (standard): 99.314-99.365 mm (3.91-3.912 in)
Number of piston rings (compression / oil): 2/1
Connecting rod small end diameter (standard): 24.940-24.978 mm (0.9819-0.9834 in)
Piston pin diameter: 24.996-25.001 mm (0.9841-0.9843 in)
Side clearance (Top): 0.038-0.076 mm (0.0015-0.003 in)
Side clearance (Second): 0.038-0.076 mm (0.0015-0.003 in)
Side clearance (Oil): 0.060-0.210 mm (0.0024-0.0083 in)
Ring end gap (Top): 0.254-0.508 mm (0.01-0.02 in)
Ring end gap (Second): 0.254-0.508 mm (0.01-0.02 in)
Ring end gap (Oil): 0.254-1.270 mm (0.01-0.05 in)
Ring width (Top): 1.971-1.989 mm (0.0776-0.0783 in)
Ring width (Second): 1.971-1.989 mm (0.0776-0.0783 in)
Ring width (Oil): 3.848-3.975 mm (0.1515-0.1565 in)
Number of main bearings: 5
Crankshaft main journal diameter: 63.487-63.513 mm (2.4995-2.5005 in)
Crankpin journal diameter: 53.950-53.975 mm (2.124-2.125 in)
Crankshaft center distance: 42.0 mm (1.655 in)
Cylinder head
Cylinder head alloy: Cast-iron
Valve arrangement: OHV, chain driven
Valves: 2 (16 valves in total)
Intake timig: 250°
Exhaust timig: 264°
Valve head diameter (INTAKE): 48.665 mm (1.9159 in)
Valve head diameter (EXHAUST): 41.250 mm (1.624 in)
Valve length (INTAKE): 124.280-125.92 mm (4.8929-4.9575 in)
Valve length (EXHAUST): 124.64-125.27 mm (4.9071-4.9319 in)
Valve steam diameter (INTAKE): 7.899-7.925 mm (0.311-0.312 in)
Valve steam diameter (EXHAUST): 7.899-7.925 mm (0.311-0.312 in)
Valve spring free length (INTAKE): 49.962 mm (1.967 in)
Valve spring free length (EXHAUST): 49.962 mm (1.967 in)

Tightening procedure and torque specs

Main bearing beam bolts: 115 Nm; 11.5 kg·m; 85 ft·lb in two-three stages
Connecting rod bearing bolts 61 Nm; 6.0 kg·m; 45 ft·lb
Flywheel fixing bolts 75 Nm; 7.5 kg·m; 55 ft·lb
Cylinder head Step 1: 68 Nm; 6.8 kg·m; 50 ft·lb
Step 2: 143 Nm; 14.0 kg·m; 105 ft·lb
Cylinder head cover bolts 11 Nm; 1.1 kg·m; 8.1 ft·lb

Service Data

Cylinder compression: 689 kPa (100 psi)
Oil system
Lubrication system: Pressurized lubrication
Oil type: API: SH or SH/CD
Recommended oil: SAE 10W-30
Oil capacity: With oil filter: 4.7 L (5.0 US. qt, 4.14 Imp. qt.)
Oil pressure: 41.4 kPa (0.4 kg/cm3; 6 psi) at Idle rpm
207-552 kPa (2.1-5.6 kg/cm3; 30-80 psi) at 3,000 rpm
Fuel system
Type: Multiple-point fuel injection system
Ignition system
Type: Electronic ignition system with mechanical distributor
Spark plug: Champion RC12YC
Spark plug gap: 0.9 mm (0.0354 in)
Spark plug torque: 41.0 N·m (4.2 kg·m, 30.2 ft·lb)

Applications

Model Years Produced
Dodge Dakota 5.2L 1992–2000
Dodge Ram 5.2L 1992–2001
Dodge Durango 5.2L 1998–2000
Dodge Ramcharger 5.2L 1992–1993
Dodge Ram Van 5.2L 1992–2003
Jeep Grand Cherokee ZJ 5.2L 1993–1998

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