AC Ace Bristol
The AC Ace Bristol is one of the most beautiful and significant British sports cars of the 1950s, and its importance extends far beyond its own considerable merits — for it was the Ace that Carroll Shelby chose as the basis for the Cobra, one of the most legendary sports cars in automotive history.
The Ace was designed by John Tojeiro and adopted by AC Cars of Thames Ditton, Surrey, in 1953. The original car used AC's own elderly 2.0-litre overhead-cam six-cylinder engine, but in 1956 the Bristol engine option transformed the car. The Bristol BS1 Mk II was a 2.0-litre inline-six derived from the pre-war BMW 328 engine, featuring hemispherical combustion chambers, inclined valves operated by a complex pushrod system, and a remarkably high state of tune for its capacity. With three Solex downdraft carburetors, it produced 125 bhp — a significant improvement over the AC unit.
The Ace's chassis was a tubular steel ladder frame, light and relatively simple. The suspension at both ends used an innovative arrangement of transverse leaf springs and lower wishbones, providing fully independent geometry all round — unusual for a sports car of this period and price point. The result was handling that was widely praised as among the finest available in any sports car of the era.
The body was hand-formed aluminium, beaten over a wooden buck by skilled craftsmen at AC's Thames Ditton works. The shape, derived from Tojeiro's racing car design, was exquisite — a flowing, organic form that combined sensuality with purpose. The low-cut doors, simple grille, and graceful rear deck created a silhouette that remains as beautiful today as when it was new.
With the Bristol engine, the Ace was genuinely fast. A top speed of 120 mph and 0-60 in 9.0 seconds made it competitive with the Jaguar XK150 and Austin-Healey 3000, while its substantially lighter weight gave it superior handling. The Ace Bristol was also highly successful in racing, with notable results at Le Mans and in GT racing throughout the late 1950s and early 1960s.
Just 466 Ace Bristols were built (out of approximately 723 total Aces across all engine types). This rarity, combined with the car's beauty, competition heritage, and crucial role as the Cobra's progenitor, has made the Ace Bristol one of the most sought-after and valuable British sports cars of its era.
The AC Ace Bristol is a rare and valuable car; expert guidance from an AC specialist is essential. The tubular chassis should be inspected for corrosion, particularly at the joints and mounting points. The hand-formed aluminium body does not corrode but can suffer from fatigue cracking at stress points. The Bristol engine is a complex and specialist unit — parts are available through Bristol specialists but are expensive. The transverse leaf spring suspension design is unique and requires knowledgeable maintenance. Originality and provenance are crucial to value — verify chassis and engine numbers through the AC Owners' Club. Competition history adds significant value. A full professional inspection is essential before any purchase.
AC Ace total production (all engine types): approximately 723 units (1953-1963). Ace Bristol: approximately 466 units. Ace with AC engine: approximately 226 units. Ace with Ford 2.6L engine: approximately 37 units. The Ace-Bristol was the most popular variant thanks to the Bristol engine's superior performance. The Aceca (fixed-head coupe version) was produced in smaller numbers. Carroll Shelby's request to AC for a chassis to accept a Ford V8 led directly to the creation of the AC Cobra in 1962.