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).
Log of engineering modifications and experiments, including for the 20HP chassis, from 1925.
| Identifier | ExFiles\Box 57\1\ Scan211 | |
| Date | 19th November 1925 | |
| -3- X5770 By/ss{S. Smith}5/DB.{Donald Bastow - Suspensions} 19.11.25 X8770 Date Issued. Title. Drg:No. Authority. 31.8.25. Carb:Choke Tubes giving improved drainage conditions. E.53675/6. E1/M.12.8.25. 28.8.25. Carb:Body & Spray Chamber in alum: with 1.500 dia: throttle. E.53668/73. E1/M.12.8.25. R4/M.25.8.25. 27.6.25. Silencer Steady Bracket. E.53633/6. LeC.2085. 27.5.25. Valve Tappet Lubrication. (Plugs in Roller Pin.) E.53627/9. Scheme 657. BY's Instructi 27.4.25. Silencer Steady Bracket. E.53566/72. LeC.2040. 20HP Chassis Experiments 3.10.25. Silencer & Cut-out. E.53712 to E.53735. "N" Scheme 2032. 14.9.25. Carburetter with HS{Lord Ernest Hives - Chair} Diffuser Jet. E.53699 to E.53708. E1/M.12.8.25. Scheme 692. 4.9.25. Carburetter Suction Piston & details in alum:similar to 40/50HP. E.53677/ E.53696. E1/M.12.8.25 R4/M.25.8.25. 4.9.25. Dowelled Slipper Flywheels. E.53690/3. LeC.2126. 1.9.25. Carb:Suction Chamber Spring Fixing.(C's'k Screw & Special Nut). E.53687/9. E1/M.12.8.25. | ||