English Racing Automobiles

English Racing Automobiles (ERA) was a British racing car manufacturer active from 1933 to 1954.

ERA was founded by Humphrey Cook, Raymond Mays, and Peter Berthon in November 1933 and established in Bourne, Lincolnshire, next to Eastgate House, the family home of Raymond Mays between Eastgate road and Spalding road. Their ambition was to manufacture and campaign a team of single seater racing cars capable of upholding British prestige in Continental European racing.

With the cost of aspiring to full Grand Prix racing prohibitive, they instead aimed ERA's efforts at the smaller voiturette—1500cc supercharged—class of motor racing, the Formula 2 equivalent of the day. Humphrey Cook financed the operation—using the wealth from the family drapery business, Cook, Son & Co., of St Paul's Churchyard, London. Peter Berthon was responsible for the overall design of the cars, while Raymond Mays became its principal driver—having already successfully raced several other makes including Vauxhall, Bugatti and Riley.

A new chassis was conceived by British designer Reid Railton (who had also successfully designed the Bluebird land speed record cars for Malcolm Campbell) and was constructed by Thomson & Taylor at Brooklands. The engine was based on the well proven Riley 6-cylinder unit, albeit this was modified in a number of significant ways. A stronger forged crankshaft with a large centre Hyatt roller bearing was made and an entirely new aluminium cylinder head designed. The engine was supercharged using a bespoke supercharger designed by Murray Jamieson who had worked with Mays & Berthon on the White Riley. The ERA engine was designed around three capacities—a base 1500cc, an 1100cc and also was capable of being expanded up to 2000 cc. It ran on methanol and in its 1500cc form was capable of producing around 180–200 bhp with in excess of 250–275 bhp in 2000cc form.

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