Jaguar XK150 S 3.8

Jaguar XK150 S 3.8

The Jaguar XK150 S 3.8 represents the pinnacle of the XK sports car lineage that began with the sensational XK120 in 1948. Introduced in late 1959, the 3.8-litre S specification combined the most powerful engine Jaguar had yet offered in a production sports car with the refinement and all-disc braking that distinguished the XK150 from its predecessors.

The 3.8-litre version of the legendary XK twin-cam engine produced 265 brake horsepower at 5500 rpm in S specification, thanks to a straight-port cylinder head, triple SU carburetors, and the larger displacement achieved by increasing the bore from 83mm to 87mm. Torque increased proportionally, delivering 260 lb-ft that provided effortless acceleration through the four-speed manual gearbox with overdrive.

The XK150 had already distinguished itself as the first production Jaguar to feature disc brakes on all four wheels, using Dunlop units developed in collaboration with the competition department. The S model benefited from this technology, providing stopping power commensurate with its considerable performance. At 133 mph, the XK150 S 3.8 was among the fastest production cars in the world.

Styling evolved significantly from the earlier XK models, with a one-piece curved windscreen replacing the flat divided screen, higher waistline, and wider doors for easier entry and exit. The overall effect was of a more mature, sophisticated grand tourer while retaining unmistakable XK DNA. The fixed-head coupe offered particularly elegant proportions.

Inside, the cockpit featured comprehensive instrumentation, leather trim, and a level of comfort that made transcontinental journeys genuinely pleasurable. The wider body provided more shoulder room, and the seats offered improved support compared to earlier XK models.

Production of the 3.8 S was limited, with approximately 888 units produced across all body styles. This rarity, combined with the car's position as the most powerful and developed of the XK line, has made it highly sought after by collectors. The XK150 S 3.8 served as the mechanical foundation for the E-Type that followed, sharing its engine specification and disc brake system.

Motor magazine tested the XK150 S 3.8 and recorded a top speed of 136 mph with a 0-60 time of 7.3 seconds, describing it as the fastest genuine production car they had tested. The car bridges the classic beauty of the early XK line with the technological sophistication that would define Jaguar's sports cars in the 1960s and beyond.