List of modifications and improvements for the 20/25 chassis.
| Identifier | ExFiles\Box 5a\1\ 01-page246 | |
| Date | 7th November 1931 | |
| Sft. {Mr Swift} from Hs. {Lord Ernest Hives - Chair} c. By. {R.W. Bailey - Chief Engineer} c. Mor. He.1/AHR 7.11.31. 20/25 CHASSIS IMPROVEMENTS. Below is a list of modifications we expect to be fitted at the 175 chassis in T. series. We expect to be able to release all these sections in 4 weeks. Crankshaft with balance weights. E.57401 fitted to 18-GIV (master drg. E.57271) 2.000 pins Low inertia spring drive. 2.125 journals. Balance weights R's 8-weight. L.eC.2963 Sch.1546 Thin web flywheel. Low Inertia Slipper Drive. Complete to LOP. E.54745 Front end of crankshaft Wheelcase. Fan bracket. Connecting Rods for 2.000" dia. crankpins. Complete to LOP. E.55884 Bottom half crankcase. Oil fitting. Oil filter. Oil level indicator. Camshaft with cam forms to give 400 valve lift. E.57177 D.O. are looking into the question of clearances in valve springs and washers owing to extra lift. High compression piston. E.57122 Larger exhaust system P.2 type. N.sch.3357. Latest This is waiting for final instructions from Exp. Dept. 3.000 dia. Propeller shaft. Latest synchro mesh. .300 gearwards. C54920. | ||
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).