Jaguar XK6 "A" type head (1949)
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Home » Racing Engines » Jaguar XK6 "A" type head
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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
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Cylinder head gasket

Drawings

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