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Specifications
Introduced in 1949
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Dimensions
Cylinders arrangement: inline 6
Strokes: 4
Bore x Stroke: 83.0 mm x 106.0 mm, 3.268" x 4.173"
Capacity: 3442cc, 210ci
Compression ratio: 8.0:1 or 9.0:1
Materials
Cast iron block without cylinder liners
RR50 aluminium "A" type cylinder-head with hemispherical combustion chambers and silver cam covers. Click here
EN16 steel crankshaft with 7 main bearings
Steel connecting rod
Cylinder-head
Dual overhead camshafts (DOHC), chain driven with 2 stage double chains
2 valves / cylinder - 12 valves total
30o angle between inlet valve and vertical
45o angle between exhaust valve and vertical
44.5mm inlet valve diameter
36.5mm exhaust valve diameter, M: 38.1mm exhaust valve diameter
valves clearences (cold), intake valve 0.15mm, exhaust valve 0.20mm
Aspiration
Natural with 2 x double SU H6 Carburetors
Ignition
Firing order, 1 - 5 - 3 - 6 - 2 - 4, with number 1 cylinder being at the rear of the engine (flywheel)
Spark plug gap 0.56mm
Contact breaker point gap 0.30mm
Cooling and lubrication
Water cooled, cooling fluid capacity 14 lt
Wet sump with a gear-type pump, oil capacity 13 lt
Torque values
Bolts | Foot Pounds | kg.m |
---|---|---|
Cam bearing caps | 15 | 2 |
Connecting rod caps | 37 | 5.1 |
Main bearing cap | 83 | 11.5 |
Cylinder head nuts | 54 | 7.5 |
Flywheel | 67 | 9.3 |
Models used and Output
Year | Model | Induction | Compression ratio | Power | Torque |
---|---|---|---|---|---|
1949 | Jaguar XK120 | 2 x SU H6 | 8.0:1 | 160 HP / 119 KW @ 5000 rpm | 262 Nm / 193 ft lbs @ 2500 rpm |
1951 | Jaguar XK120 M | 2 x SU H6 | 9.0:1 | 180 HP / 134 KW@ 5300 rpm | 275 Nm / 203 ft lbs @ 4000 rpm |

Drawings
