Jaguar XK120 / XK140 / XK150 — General Data
From the Jaguar Mark VII and XK 120 Service Manual with XK 140 Supplement, issued by Jaguar Cars Limited, Coventry, England.
Engine
| Type | Twin Overhead Camshaft |
| Bore | 3.2677″ (83 mm) |
| Stroke | 4.1732″ (106 mm) |
| Number of Cylinders | 6 |
| Capacity | 3,442 cc (210 cu. ins.) |
| R.A.C. Rating | 25.6 hp |
| Maximum B.H.P. (8:1 C.R.) | 160 at 5,200 rpm |
| Maximum B.H.P. (7:1 C.R.) | 150 at 5,200 rpm |
| Maximum Torque | 195 lb. ft. at 2,500 rpm |
| Compression Ratio | 8:1 or 7:1 |
| Firing Order | 1, 5, 3, 6, 2, 4 |
Engine Details
| Cylinder Block | Cast integral with crankcase in high grade chrome iron with full length water jacket |
| Cylinder Head | High tensile aluminium alloy with hemispherical combustion chambers; alloy iron valve seats shrunk into head |
| Camshafts | Twin overhead, running in oil bath, operating valves direct through floating tappets; four steel-backed precision bearings each |
| Crankshaft | Steel forging with integral counterweights, seven steel-backed precision bearings, 2½” diameter, with torsional vibration damper |
| Pistons | Aluminium alloy with fully floating gudgeon pins; two compression rings and one oil scraper ring; top ring hard chromium plated |
| Ignition | Coil and distributor with centrifugal advance and vacuum control |
| Sparking Plugs | Champion NA.8 (8:1 C.R.); Champion L.10S (7:1 C.R.) |
| Carburetters | Twin horizontal S.U. with thermo-electric auxiliary starting carburetter; hydraulic piston dampers; air cleaners fitted |
| Lubrication | Full pressure; gear type pump with full-flow pressure filter to main oil line |
Fuel System
| Fuel Supply | S.U. electric pump from 15 gallon rear tank (auxiliary 10 gallon tank available to special order) |
Transmission
| Clutch | 10″ Borg & Beck flexible dry single plate |
| Gearbox | Single helical, four forward speeds and reverse; synchromesh on top, third and second |
| Gearbox Oil Capacity | 2½ pints (1.4 litres) |
| Top Gear | 1 : 1 |
| Third Gear | 1.367 : 1 |
| Second Gear | 1.982 : 1 |
| First Gear | 3.375 : 1 |
| Reverse | 3.375 : 1 |
| Propeller Shaft | Hardy Spicer with needle bearing universal joints |
Rear Axle
| Type | Hypoid spiral bevel, semi-floating with offset pinion shaft |
| Ratio (Standard) | 3.64 : 1 (early); 3.77 : 1 (later) |
| Ratio (High) | 3.27 : 1 (early); 3.31 : 1 (later) |
Steering, Brakes and Suspension
| Steering | Burman recirculating ball worm and nut; 17″ steering wheel, adjustable for reach |
| Brakes (XK120) | Lockheed hydraulic, all four wheels; front: two leading shoe type; 12″ diameter alloy iron drums |
| Brakes (XK140) | Lockheed hydraulic, all four wheels; optional servo kit available |
| Brakes (XK150) | Dunlop disc brakes on all four wheels |
| Hand Brake | Central fly-off, operates mechanically on rear wheels only |
| Front Suspension | Independent with transverse wishbones and long torsion bars; telescopic hydraulic shock absorbers |
| Rear Suspension | Long silico-manganese steel half elliptic springs; Girling PV.7 hydraulic shock absorbers |
Wheels and Tyres
| Wheels (XK120) | Pressed steel with detachable chrome plated nave plates, five stud mounting |
| Wheels (XK140/150) | Pressed steel or optional wire wheels |
| Tyres (XK120) | Dunlop “Road Speed” 6.00 x 16″ |
Electrical Equipment
| System | Lucas de Luxe; 12 volt |
| Battery | 64 amp capacity, 10-hour discharge, twin batteries |
| Dynamo | Constant voltage controlled ventilated |
Capacities
| Engine Sump (stepped base) | 21 pints |
| Engine Sump (flat base) | 24 pints |
| Engine Total (stepped base) | 24 pints |
| Engine Total (flat base) | 29 pints |
| Cooling System | 25½ pints |
| Gearbox | 2½ pints (1.4 litres) |
| Fuel Tank | 15 gallons |
Dimensions and Weights — XK120
| Wheelbase | 8′ 6″ (2.591 m) |
| Track, Front | 4′ 3″ (1.295 m) |
| Track, Rear | 4′ 2″ (1.270 m) |
| Overall Length (Super Sports) | 14′ 5½” (4.406 m) |
| Overall Width | 5′ 2″ (1.575 m) |
| Overall Height (Super Sports) | 4′ 4½” (1.333 m) |
| Overall Height (Fixed Head Coupé) | 4′ 5″ (1.346 m) |
| Turning Circle | 31′ (9.45 m) |
| Ground Clearance | 7½” (181 mm) |
| Weight, Dry (Super Sports) | 24.5 cwt (2,744 lbs / 1,245 kg) |
| Weight, Dry (Fixed Head Coupé) | 25.5 cwt (2,856 lbs / 1,295 kg) |