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 specifications and modifications for various engine builds.
| Identifier | ExFiles\Box 155\2\ scan0131 | |
| Date | 30th August 1937 | |
| -3- Increased inertia damper Rm.{William Robotham - Chief Engineer}252. Standard production deturbulated head. Tempered Spring Co. Swedish Springs Rm.{William Robotham - Chief Engineer}260. Nos. 2, 3 and 6 ex. valves in American Sil.XCR. not stellited to EB.970. No.1 4, and 5 ex. valves standard S.965. B-9 RETURNED TO SHOP FOR INSERTION AFTER CRANK FAILURE. Old standard crankshaft with single oil holes. Old standard AC.7 main and big end bearings. Cylinder bore as honed in position on crankcase and cylinder head. Lucas distributor. Standard turbulent cyl. head and valves Rm.{William Robotham - Chief Engineer}260 Spring. B-11 (Small bore) 4.B.IV. Lead bronze centri-cast big end bearings, whitemetal main bearings. .002 oversize cylinder block. 50% increased capacity oil pump (straight gears). Otherwise old standard 3 1/2 litre unit. B.15 B.3.A2. Standard spread centre crankcase. AC.7 Hall's metal main and big end bearings. Rear bearing to Rm.{William Robotham - Chief Engineer}67 to stop cracking. Strengthened connecting rods to LeJ.5095. Increased inertia LeC. damper reduced to 25% above. | ||