The XK140 was introduced in late 1954 and sold as a 1955 model. Exterior changes that distinguished it from the XK120 included more substantial front and rear bumpers with overriders, and flashing turn signals above the front bumper. The grille remained the same size but became a one-piece cast unit with fewer, and broader, vertical bars. The Jaguar badge was incorporated into the grille surround. A chrome trim strip ran along the centre of the bonnet and boot lid. An emblem on the boot lid contained the words "Winner Le Mans 1951–3". The interior was made more comfortable for taller drivers by moving the engine, firewall and dash forward to give more legroom. Two 6-volt batteries, one in each front wing were fitted to the Fixed Head Coupe, but Drop Heads and the Open Two Seater had a single 12-volt battery installed in the front wing on the passenger side. The XK140 was powered by the William Heynes designed 3.4 litre Jaguar XKdouble overhead camshaftinline-6 engine, with the Special Equipment modifications from the XK120, which raised the specified power by 10 bhp to gross at 5500 rpm, as standard. The optional C-Type cylinder head carried over from the XK120 catalogue, and produced gross at 5750 rpmt. When fitted with the C-type head, 2-inch sand-cast H8 carburettors, heavier torsion bars and twin exhaust pipes, the car was designated XK140 SE in the UK and XK140 MC in North America. In 1956 the XK140 became the first Jaguar sports car to be offered with automatic transmission. As with the XK120, wire wheels and dual exhausts were options, with most XK140s imported into the United States having the optional wheels. Cars with the standard disc wheels had spats over the rear wheel opening. Factory spec 6.00 × 16 inch crossply tyres or optional 185VR16 Pirelli Cinturato CA67 radials could be fitted on either 16 × 5K½ solid wheels or 16 × 5K wire wheels.
Body styles
The Roadster had a light canvas top that folded out of sight behind the seats. The interior was trimmed in leather and leatherette, including the dash. Like the XK120 Roadster, the XK140 version had removable canvas and plastic side curtains on light alloy barchetta-type doors, and a tonneau cover. The door tops and scuttle panel were cut back by two inches compared to the XK120, to allow a more modern positioning of the steering wheel. The angle of the front face of the doors was changed from 45 degrees to 90 degrees, to make access easier. The windscreen remained removable. The Drophead Coupé had a bulkier lined canvas top that lowered onto the body behind the seats, a fixed windscreen integral with the body, wind-up side windows, and a small rear seat. It also had a walnut-veneered dashboard and door cappings. The Fixed Head Coupé shared the DHC's interior trim and rear seat. The prototype Fixed Head Coupe retained the XK120 Fixed Head roof-profile, with the front wings and doors the same as the Drophead. Production cars had the roof lengthened, windscreen placed further forward, shorter front wings, and longer doors, all resulting in easier entry and more interior space and legroom.
Engine specifications
Model
Years
Displacement
Configuration
Bore/Stroke
Carburettor
Power
XK 140 3.4
1954-1957
3442 cc
DOHC Straight-6
83 mm x 106 mm
Double SU H6
@ 5500 rpm
XK 140 3.4 SE
1954-1957
3442 cc
DOHC Straight-6
83 mm x 106 mm
Double SU H6
@ 5750 rpm
Performance
A stock XK-140 SE could achieve a top speed of 120–125 mph. Road & Tracks XK-140 MC test in June 1955 recorded a best two-way average of. Best one-way run was. Sports Cars Illustrateds test of the same model in Aug 1957 had a fastest two-way average of. Their best one-way run was. Karl Ludvigsen's test published in Sports Car World had the same results as the SCI test. Acceleration times from 0– were 8.4 seconds, 9.1 seconds and 9.1 seconds respectively. Only the R&T test tried 0– which took 26.5 seconds. Standing 1/4 mile times were 16.6 seconds and 16.9 seconds.
Production
Chassis numbers as supplied by Jaguar Heritage Trust
