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).
Comparison table of part counts for Wraith, Phantom III, B.50-6, and B.50-8 engines.
| Identifier | ExFiles\Box 108\2\ scan0096 | |
| Date | 1st June 1938 | |
| WRAITH, PHANTOM III AND B.50 - 6 & B.50 - 8 ENGINE PARTS. Total number of parts on Wraith, Phantom III, B.50 - 6 and B.50 - 8 engines by sections, showing number of parts common to the respective units. These figures do not include any stock parts under K numbers, or rubber, bakelite or vellumoid parts. | | PH.III. | WRAITH III. | COMMON TO BOTH. | B.50 - 6. | B.50 - 8. | COMMON TO BOTH. | |---|---|---|---|---|---|---| | Crankcase & Bearings. | 607 includes cyl.liners. | 206 | 9 | 213 with block. | 243 with block. | 204 | | Crankshaft. | 108 | 97 | 3 | 97 | 110 | 96 | | Harmonic Balancer. | None | None | | 9 less flywheel springs. | 9 less flywheel springs. | 9 | | Spring Drive. | 115 | 89 | 20 | None | None | 66 ALL | | Connecting Rod. | 162 | 66 | 12 | 66 | 88 | 90 ALL | | Piston. | 132 | 90 | 0 | 90 | 120 | 107 | | Cylinder. | 337 | 196 includes 181 cyl.block. | 7 | 108 | 118 | 149 | | Valves & Fittings. | 500 | 15 | 98 | 149 | 196 | 149 | | Inlet Pipes. | 58 | 15 | 0 | 15 | 15 | 0 | | Carburetter. | Counted as part of Fuel System. | | | | | 18 | | Camshaft. | 35 | 35 | 0 | 19 | 21 | | | Dynamo Drive. | 45 | 41 | 6 | None | None | 18 | | Water Pump Drive. | 9 | 11 | 1 | None | None | | | Idler Gear. | 23 | None | | None | None | | | Ign. Gov. and Drive. | 78 | 44 | 11 | 9 excluding advance gov.Delco unit. | 9 excluding advance gov.Delco unit. | | | Cross Drive Shaft. | 22 | None | 13 | None | None | 12 | | Water Pump. | 28 | 19 | 13 | 12 | 12 | 12 | | Oil Pump. | 17 | 13 | 4 | 12 | 12 | 4 | | Wheelcase & Fittings. | 24 | 4 | 1 | 4 | 4 | 7 | | Water Connections. | 36 | 14 | 3 | 10 | 10 | | | Oil Fittings & Petrol Drain Pipe. | 56 | 38 | 9 | 33 | 33 | 29 | | Oil Filler. | 12 | 14 | 11 | 14 | 14 | 14 | | Oil Filter. | 10 | 24 | 0 | 3 | 3 | 3 | | Oil Sump Indicator. | 45 | 28 | 0 | 8 | 8 | 8 | | Relief Valves. | 18 | 13 | 9 | 14 | 14 | 14 | | Pressure Oil Filter. | 29 | | | | | | | Oil Temp. Regulator. | 15 Less matrix tubes. | | | | | | | Fan. | 30 | 18 | 1 | 12 | 12 | 12 | | Petrol Pump. | None | None | | | Counted as part of Fuel System. | | | Totals | 2,551 | 1,256 | 218 | 897 | 1,051 | 854 | | ||