Halford Special

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The Halford Special was a Grand Prix racing car of the 1920s built by engine designer Major Frank Halford on the chassis of an early Side Valve Aston Martin tourer. It was one of the most advanced British-built racing cars of the mid-1920s and had many racing successes. Halford himself was a freelance engine designer who did work for both the de Havilland Aircraft Company and Napier & Son.

History[edit]

In 1922 Bamford & Martin company (that later became Aston Martin) produced cars to compete at the Brooklands racing circuit, for Grand Prix racing, and to set world speed and endurance records. Two works Team Cars with 16-valve twin-cam engines were built for racing, a record car known as the Razor Blade was built, and a number of other cars were built for customers for racing. One of these customer cars, chassis number 1916, was later re-built as the AM Halford and then again as the Halford Special.

The Halford Special in the paddock at Brooklands for the 1926 British Grand Prix

The early racing history of chassis number 1916 is not fully documented but what is certain is that it was crashed in 1924 and Major Halford bought the chassis and installed an engine of his own design and built a new two-seater body for the car.

Major Halford built two 6-cylinder in-line engines for the car. Each had an aluminium cylinder-block and crankcase with steel liners, with rubber seals at their base. Bore and stroke were 63 mm and 80 mm giving 1.5 litres, the Grand Prix formula for 1926. The cylinder heads were cast iron with two camshafts, twelve inclined valves, and two 12 mm plugs per cylinder.[1]

Drawing on his aircraft design skills, Frank Halford’s proposed using a turbocharger, but it proved unreliable in tests. (This was probably the first turbocharged racing car until Renault developed the Alpine turbocharged car in 1968 that went on to become successful Grand Prix cars in the 1970s).[2]

When first raced at Brooklands, at the 1925 BARC meeting in August, the car appeared with a two-litre Roots-type supercharger mounted on the front of the crankshaft.

At its first race in 1925, with the 95 bhp engine, the narrow Aston Martin radiator proved to be too small, and a wider and deeper radiator was fitted and the car was renamed more simply the Halford Special.

The second engine had twin magnetos mounted behind the two overhead camshafts and developed 120 bhp and is now installed back in the Halford Special.

Frank Halford raced his car twice in 1925 and 12 times during 1926.[3] The car was fitted with a Berk supercharger, manufactured by PressureVac Ltd., 18a North Parade, Bradford, Yorkshire.[4] Halford then sold the car to Captain G. E. T. Eyston, who would later hold the Land Speed Record, to race during the 1927 season. Captain Eyston raced the Halford Special car three times at Brooklands and achieved fourth place in the Monthléry French Grand Prix in 1927.

In the 1930s the Halford Special was dismantled by its new owner, Viscount Ridley. The first engine was fitted into a Bugatti Type 35 and the second engine was modified to keep the twin magnetos dry and put into a speedboat that sank soon after and the engine spent two years at the bottom of a lake.[5] The present owner of the Halford Special traced the original parts in the 1970s and re-assembled the Halford Special back to its original condition.[6]

The Halford Special is currently kept at the Grand Prix exhibit at the Brooklands Motor Museum and is still used periodically in Vintage Sports Car Club and other events for historic racing cars. The car was involved in an accident at a VSCC race meeting at Silverstone in 2008 but is now restored back to original condition.

Racing History 1923 to 1928[edit]

The Halford Special today at the Brooklands Motor Museum exhibition of Grand Prix Cars
The six-cylinder engine designed by Frank B. Halford in 1924 for his Halford Special. 1.5 litres with a 2-litre supercharger, 12 inclined valves and two sparking plugs per cylinder supplied by two magnetos mounted at the rear on two overhead camshafts. The Castrol oil tin was added recently to conform to current racing requirements.
Year Race Result
Aston Martin chassis number 1916, registration number OR 1
1923 May Aston Clinton Hill climb (W. G. Barlow) Entry number 22  ?
JCC Spring meeting Brooklands (W. G. Barlow) 4th
BARC Whitsun, Brooklands (W. G. Barlow?) Entry number 12  ?
BARC Autumn, Brooklands (W. G. Barlow) Entry number 9  ?
1924 Voiturette Race, Boulogne (G. E. T. Eyston) Crashed
Rebuilt as the AM Halford
1925 August BARC, Brooklands (Halford)  ?
JCC 200 Mile race, Brooklands (Halford) 5th
Rebuilt again as the Halford Special
1926 BARC Whitsun Meeting Brooklands (Halford), 90 Short 1st
BARC Whitsun Meeting Brooklands (Halford), 90 Long Handicap 3rd
BARC Whitsun Meeting Brooklands (Halford), 90 Long 3rd
BARC Easter Meeting Brooklands, (Halford), 90 Short 1st
BARC Easter Meeting Brooklands, (Halford), 90 Long Handicap 3rd, 107.34 mph (172.75 km/h)
BARC Easter Meeting Brooklands, (Halford), 100 mph (160 km/h) Handicap 2nd, 104.91 mph (168.84 km/h)
BARC 3 July, Brooklands, (Halford)  ?, 102.04 mph (164.22 km/h)
BARC Summer Meeting, Brooklands (Halford), 90 Short 2nd, 109.22 mph (175.77 km/h)
BARC Summer Meeting, Brooklands (Halford), 100 Long 1st, 109.94 mph (176.93 km/h)
BARC Summer Meeting, Brooklands (Halford), 90 Long 2nd, 109.7 mph (176.5 km/h)
17 September Meeting, Brooklands (Halford)  ?
26 September Meeting Brooklands (Halford) 4th
RAC British Grand Prix (Halford) Retired lying 4th
JCC 200-mile (320 km) race, Brooklands 10th
1927 Middlesex County AC, Brooklands (Eyston) 1st
AFC French Grand Prix, Monthléry (Eyston) 4th
Junior Grand Prix, Brooklands (Eyston) 4th
1928 Sold to Viscount Ridley, dismantled. One engine installed in a Bugatti, the second engine installed in a speedboat.

References[edit]

  1. ^ Posthumus, Cyril (1965). The British Competition Car. B. T. Batsford. 
  2. ^ The Development of the Revolutionary Turbo F1 Car 1968–1979. 
  3. ^ The AM Halford Special, The First Five Years, AM Quarterly, Volume 19 Number 77, Summer 1981. 
  4. ^ Motor Sport, May 1926, Pages 363–364.
  5. ^ Bateman, John (1994). The Enthusiast’s Guide to Vintage Specials. G.T.Foulis & Co. 
  6. ^ Motor Sport, Halford Special, Story of a dedicated resurrection. March 1982.