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).
List of alterations to a governor and magneto assembly for a 10,000-mile endurance test.
| Identifier | ExFiles\Box 48\2\ Scan378 | |
| Date | 8th May 1928 guessed | |
| contd :- -4- have fitted up on 12-EX for the next 10,000 miles test has the following alterations. (1) Aluminium governor weights. Half the mass of the original steel weights. (2) Duralumin small inner relay piston. (3) Improved arrangement of leather and ring, large relay piston. (4) 7° initial advance on relay obtained by dropping floor of chamber .100". (Neck of governor rod already as close as possible to small piston). [Diagram text] Floor dropped .100" (5) Return spring over relay 12 lbs. in retard position as at present. (6) Present standard magneto with sleeve friction 2½ lbs. and light return spring. The resulting advance curve with oil pressure of 10 - 15 lbs/sq.in. at 60°C is shewn in Graph 11. | ||