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ERA R1A

ERA R1A ERA R1A ERA R1A ERA R1A ERA R1A ERA R1A
Click here to save all images    Image credits: Wouter Melissen 

    

Click here to download printer friendly version British Motorracing was at an all-time low in 1933, Bentley's Le Mans domination seemed ages away and Britain's last international single seater success dated back to the early 1920s. A wealthy amateur racer felt something had to be done and he provided the finances for setting up a new company. The effort was headed by Raymond Mays, who had already scored many successes with Invictas and in 1933 had campaigned a Riley special. ERA (English Racing Automobiles) was the name picked for the company and cars. Reid Railton was hired as designer of the new car for the Voiturette class.

Riley's straight six engine was the logical power choice after Mays' experience with it in 1933. The 'six' was by no means conventional, as it featuring camshafts on either side of the engine. One camshaft operated the intake valves, the other for the exhaust valves, both actuated by pushrods. Two engines were available in the first cars; a 1.1 litre and a 1.5 litre. Assisted by a large roots-type supercharger the latter was good for around 166 bhp. Mated to the modified Riley unit was a Wilson pre-selector gearbox. Pre-selector gearboxes were very popular in the 1930s. Drivers selected the gear before using the clutch so that the selected gear was automatically engaged when the clutch was pressed.

Railton designed a ladder-frame chassis, much like that of the competitors. Front and rear suspension was made up of live axles, sprung by semi-elliptical leaf springs and damped by Hartford friction shock absorbers. Large drum brakes made sure the ERA stopped quickly to compliment its already fierce acceleration.

A series of four A-Type ERAs, R1A through R4A, were built and raced by the works team in 1934 and 1935. For the first privateers, a slightly revised B-Type chassis featuring a more reliable engine became available in 1935. 13 of these were built, R1B through R14B. Chassis number 13 was not used for superstitious reasons. Customers included one of the best known privateers of the era; Prince Birabongse Bhanubandh, 'B.Bira' of Thailand. His three B-Types secured over 20 British and International victories. Most famous of all ERA drivers was Richard Seaman, whose performance in R1B earned him a spot in the Mercedes Benz Works racing team.

Featured is the very first ERA constructed; R1A. Raymond Mays himself used the car early in its career. The ERA showed good potential, but it regularly suffered from new-car gremlins. After these were ironed out, Mays started racking up victories and podium finishes. In the following years, it was raced by a large number of drivers for the Works team. It was eventually sold to Norway late in 1936 and used throughout Europe, again with success. After the War, it was raced to two wins by Reg Parnell.

Like so many ERAs, R1A was never really retired and used regularly in historic racing. Originally fitted with a 1.1 litre engine, it quickly received a 1.5 litre version of the supercharged six cylinder engine. While it has been restored to its 'original' condition, the larger engine was retained. In one of its many outings, R1A is pictured above during the 2006 Goodwood Revival meeting.

Article by Wouter Melissen, last updated on 04 / 25 / 2007

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General specifications
Country of origin Great Britain
Chassis number R1A
Numbers built 4 A-types
Produced in 1934

Engine
Configuration Straight 6
Location Front, longitudinally mounted
Construction cast-iron block, aluminum head
Displacement 1.488 liter / 90.8 cu in
Bore / Stroke 57.5 mm (2.3 in) / 95.2 mm (3.7 in)
Compression 6.0:1
Valvetrain 2 valves / cylinder, Double side cams
Fuel feed SU Carburetor
Aspiration Roots type supercharger

Drivetrain
Chassis/body body on ladder frame
Suspension (fr/r) live axle, semi-elliptic springs, Hartford friction dampers
Steering Burman steering box
Brakes Lockheed drums, all-round
Gearbox Wilson preselector 4 speed Manual
Drive Rear wheel drive

Dimensions
Weight 914 kilo / 2015 lbs
Length / Width / Height N/A / N/A / 1118 mm (44 in)
Wheelbase / Track (fr/r) 2438 mm (96 in) / 1333 mm (52.5 in) / 1219 mm (48 in)

Performance figures
Power 150 bhp / 112 KW @ 6500 rpm
BHP/Liter 101 bhp / liter
Power to weight 0.16 bhp / kg

Resources
Suggested reading ERA, a Concise History by J.R.W. Barker
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