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 modifications to the specification for the Spectre 7 unit.
| Identifier | ExFiles\Box 91\3\ scan0065 | |
| Date | 2nd August 1935 | |
| 2.8.35. MODIFIED SPECIFICATION OF SPECTRECodename for Phantom III 7 UNIT. The following is a list of modifications to the specification HS{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}5/KW.4.7.35. (1) Strap type connecting rods with white metal bearings. (2) Steel push rods LeC.4250. (3) Solid exhaust valves, deleting the lightening holes in the stems. (4) 1 1/4 engine speed dynamo and water pump LeC.4545 & LeC.4406, LeC.4614, LeC.4410. (5) Larger slipper flywheels LeC.4475, idler wheels to suit LeC.4433 and wheelcase LeC.4451. (6) Relief valve to LeC.4385 and seats LeC.4553, and modified oil passages to LeC.4344. (7) Longer filler cap to LeC.4541. (8) Crankcase breather LeC.4542. (9) N.Sch.4571 larger main flywheel. (10) LeC.4252 baffled sump. (11) Dynamo pinion spindle to Hs.{Lord Ernest Hives - Chair}1843 with spiral grooves and deleting the pressure feed. (12) Large oil pump LeC.4400. (13) LeC.4537 top water rails. (14) Engine rear support feet LeC.4587. (15) Camshaft to include additional keyway Hs.{Lord Ernest Hives - Chair}1768 for selective valve timing. (16) Modified tappet metering screws Hs.{Lord Ernest Hives - Chair}1979. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||