Background
It is claimed that the XK120 was designed in less than three months by Jaguar’s founder Sir William Lyons and his chief engineer, William Heynes. Originally the car was merely conceived as a show car and test bed for the new XK engine before it went into full-scale production for the Mark VII saloon. Maybe this is why the design process was dispatched with such alacrity. The “XK120” nomenclature was a nod towards the car’s XK engine and the 120mph (plus) top speed that the former enabled the car to achieve.
The XK120 was revealed to the public at 1948 London Motor Show in open two-seater form. In the austere, post-war climate of 1948 the XK120 must have represented sleek and exciting beacon of hope for the future. Whether this was the reason or not, the XK120 was universally well received. The sophisticated DOHC 160bhp engine seemed like a unit previously only offered with cars for the super-rich like Stutzes and Duesenbergs. The fact that it was promoted at Earls Court with a projected sticker price of just £999 meant that you just had to be comfortably off to be able to afford one.
Naming their car so boldly, it became incumbent on Jaguar to prove the “120” claim. In May 1949 a stretch of high-speed autoroute between Jabbeke and Aeltre in Belgium was closed off for a special demonstration to the press. The white left-hand drive XK120 to be used, chassis number 670002, was only the second to be built. Jaguar development engineer, Walter Hassan, was slated to drive the car but fell ill. And so, test driver Ron “Soapy” Sutton stepped into the breach. The car was stripped of hood, side screens and windscreen. With a full-length aluminium undertray added, a metal airflow deflector fitted in front of the driver and a tonneau cover fastened over the passenger side of the cockpit, Soapy set off. The Jaguar was timed through the flying mile by the Royal Automobile Club of Belgium at 132.596 mph with the XK120 subsequently crowned as the fastest production car in the world. A modified production XK120 would return to Jabbeke in 1953 to record a flying mile at a speed of 147.662mph, but more of this later!
The XK120 entered production in 1949 with the first 200 painstakingly hand built in aluminium. With public demand egging them on Jaguar retooled to produce in volume and in steel in 1950. By the time the car was replaced by the XK140 in 1954 a total of 12,045 XK120s had been built, 6,436 of those being left hand drive open two seaters.







