Halford Special

Halford himself was a freelance engine designer who did work for both the de Havilland Aircraft Company and Napier & Son.

[1] Drawing on his aircraft design skills, Frank Halford's proposed using a turbocharger, but it proved unreliable in tests.

[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.

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.

Captain Eyston raced the Halford Special car three times at Brooklands and achieved fourth place in the Montlhéry French Grand Prix in 1927.