From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Report from the 1930 Motor Show detailing specifications for Alfa Romeo and Aston-Martin vehicles.
| Identifier | ExFiles\Box 124\5\ scan0012 | |
| Date | 6th November 1930 | |
| To R.{Sir Henry Royce} From Ha/IAL. c. to Sg.{Arthur F. Sidgreaves - MD} Nor. c. to Z. RE. c. to BY.{R.W. Bailey - Chief Engineer} X4482 x631. x4482. THE MOTOR SHOW 1930. ALFA ROMEO. 1750 c.c. Six Cylinder Supercharged. The braking is 75% on the front 25% on the rear. All the equalising parts for the brakes are collected and enclosed in the bottom of the gearbox, all working in oil. The displacement of the supercharger is actually slightly less than that of the engine, so there is no boost below 2000 R.P.M. This rises to 7 lbs. per sq.in. at maximum R.P.M. The boost has slightly been reduced on this year's production. Below 2000 R.P.M. there is a by-passing passage through which the engine sucks direct from the carburetter. There is a non-return valve which closes at atmospheric pressure for speeds above 2000 R.P.M. The compression ratio is 5.5 to 1 and standard petrols can be used with 2% of oil for lubricating the supercharger. They stated both on this stand and the Bugatti stand that their principle demands were for closed cars. ASTON-MARTIN. Four Cylinder 1500 c.c. The braking is 70% on the front 30% on the rear. The engine is mounted on four flat strips of spring steel. This is intended to make the mounting flexible in a vertical plane. They say this moves the vibration period due to | ||