Jaguar XK6 "A" type head (1949)

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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
30^o angle between inlet valve and vertical
45^o 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

Source

Drawings

Source