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 engineering alterations for various components.
| Identifier | ExFiles\Box 18\6\ Scan054 | |
| Date | 8th December 1919 guessed | |
| "A" DEPT. ALTERATIONS. Wheelcase & Gears. E.17637 - Cover. 30º±1º Angle of Hexagon chamfer to be added. D.O. omission. Distributor. U.2195 - Terminal Insulator. Alter counterbore at knurled end from .375+10 to .400+10 to pass .375±20 projection on Terminal Plate E.1442. Distributor. E.17723. Insulating Disc. Dimen: .200±10 to be added. D.O. omission. Distributor. E.1407 and E.18250. Contact Rings. Drill .093±5 dia. to be added. D.O. omission. Magneto Drive. U.801 & U.802. Brake straps. Works desire the hole for hinge pin altering from .187±5 to .185±2 to give better results with standard pin K.6413 which is .1865-2 dia. Magneto Drive. E.17220. Magneto Bedplate. Works suggest both dowel holes to be drilled .250 deep, to prevent danger of drilling wrong hole right through and cutting into web. Piston. E.17020 - Piston Ring Stop. Depth of slot altered from .375-10 to .350-15 to give longer bedding surface in piston wall. Pressure Feed Pump. E.5205 - Cylinder. Distance from face of flange to inner edge of inlet port altered from 1.050±15 to 1.025±5, and limit on width of port altered from +15 to -10, to give better delivery pressures on production pumps. | ||