Technical Data
ENGINE - 4.6 V8Type 4.6 litre V8
Number of cylinders Eight, two banks of four
Bore 94.00 mm (3.70 in)
Stroke 82.00 mm (3.22 in)
Capacity 4555 cc (278 cu in)
Valve operation Overhead by push-rod
Compression ratio:
High Compression version 9.35:1
Low Compression version 8.36:1
Maximum power:
High Compression version 165.5kW at 4750 rpm
Low Compression version 157kW at 4750 rpm
Crankshaft
Main journal diameter 63.500 - 63.487 mm (2.50 - 2.4995 in)
Crankpin journal diameter 55.513 - 55.500 mm (2.1855 - 2.1850 in)
Crankshaft end thrust/end float 0.10 - 0.20 mm (0.004 - 0.008 in)
Taken on center main bearing
Main Bearings
Number and type 5, Vandervell shells
Material Lead bronze with lead-indium overlay
Diametrical clearance 0.015 - 0.060 mm (0.0006 - 0.0024 in)
Connecting Rods
Type Horizontally split big-end, plain small-end
Length between centres 149.68 - 149.78 mm (5.893 - 5.897 in)
Big-End Bearings
Type and material Vandervell VP Lead bronze with lead-indium overlay
Diametrical clearance 0.015 - 0.060 mm (0.0006 - 0.0024 in)
Piston Pins
Length 60.00 - 60.50 mm (2.3622 - 2.3819 in)
Diameter 23.995 - 24.000 mm (0.9447 - 0.9449 in)
Fit-in connecting rod Press fit
Clearance in piston 0.015 - 0.006 mm (0.0006 - 0.0002 in)
Pistons
Clearance in bore: 0.020 - 0.050 mm (0.0008 - 0.0020 in)
Measured at bottom, right angle to piston pin
Piston Rings
Number of compression rings 2
Number of oil control rings 1
No 1 compression ring Nitrided steel barrel faced
No 2 compression ring Tapered spherical barrel marked 'TOP'
Width of compression rings
No 1 compression ring 1.478 - 1.49 mm (0.0582 - 0.0587 in)
No 2 compression ring 1.21 - 1.23 mm (0.0476 - 0.0484 in)
Compression ring gap
No 1 compression ring 0.40 - 0.65 mm (0.0157 - 0.0256 in)
No 2 compression ring 0.3 - 0.5 mm (0.0118 - 0.0197 in)
Oil control ring type Aclonoform
Oil control ring width 3.0 mm (0.1181 in)
Oil control ring rail gap 0.38 - 1.40 mm (0.0150 - 0.0551 in)
Camshaft
Location Central
Bearings Non serviceable
Number of bearings 5
Drive Chain 9.52 mm pitch x 54 pitches.
Camshaft end float 0.076 - 0.355 mm (0.003 - 0.014 in)
Tappets Hydraulic self-adjusting
Valves
Length:
Inlet 116.59 - 117.35 mm (4.590 - 4.620 in)
Exhaust 116.59 - 117.35 mm (4.590 - 4.620 in)
Seat angle:
Inlet 46° - 46° 25'
Exhaust 46° - 46° 25'
Head diameter:
Inlet 39.75 - 40.00 mm (1.565 - 1.575 in)
Exhaust 34.227 - 34.48 mm (1.3475 - 1.3575 in)
Stem diameter:
Inlet 8.664 - 8.679 mm (0.3411 - 0.3417 in)
Exhaust 8.651 - 8.666 mm (0.3406 - 0.3412 in)
Stem to guide clearance:
Inlet 0.025 - 0.066 mm (0.0010 - 0.0026 in)
Exhaust 0.038 - 0.078 mm (0.0015 - 0.0031 in)
Valve lift (Inlet and Exhaust) 9.94 mm (0.3913 in)
Valve spring length fitted 40.4 mm (1.59 in)
At pressure of 29.5 kg (65 lb)
Lubrication
System type Wet sump, pressure fed
Oil pump type Rotor
Oil pressure 2.11 to 2.81 kg/cm2 (30 to 40 psi)
At 2400 rpm with engine warm
Oil filter-internal Wire screen, pump intake filter in sump
Oil filter-external Full flow, self-contained cartridge