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).
Specification for upgrading a B.V. No.3 engine unit for installation into a 3.B.50 chassis.
| Identifier | ExFiles\Box 168\3\ img055 | |
| Date | 31th December 1938 | |
| To- [illegible] c. Rm{William Robotham - Chief Engineer}/PD. cc. Rm{William Robotham - Chief Engineer}/VMB 6119 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/WW.31.12.38. W3 Nọ9 3.B.50. -> 1B50. When B.V. No.3 unit is removed from 29.G.VI in order to install B.60 No.2 unit in this chassis we propose to bring B.V. No.3 unit up to date and install in the above 3.B.50 chassis. The assembly specification should be as follows, plus any faulty parts revealed on inspection. (1) Existing main bearings if in good condition. (2) Existing connecting rods if crack test O.K. likewise big ends which are not flanged if in good condition. (3) Raised crown pistons (P.452) which Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} will supply; these with .030 gasket giving a comp. ratio 6.5 : 1. (4) Modified cored cylinder block EW.1923. (5) " " " head EW.1922. (6) .030 Klingerit cylinder head gasket which Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} will supply, EW.1933. (7) Fit ECD.1022 top valve spring seal washers. (8) Rolls-Royce distributor to be fitted having Bentley V governor characteristics. (9) Inspect and measure timing gears for backlash. (10) Up to date induction system to LOP.EB.4233 to be fitted. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} to supply carburetters. (11) Flywheel and clutch to be specified by Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||