Specifications for two engine builds, B-18 for testing with Nelson Bohnalite pistons and B-19 for assembly.
| Identifier | ExFiles\Box 155\2\ scan0133 | |
| Date | 30th May 1937 | |
| -5- Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} S/JH.30.5.37. B-18. Tests on bed with Nelson Bohnalite piston. Standard prod. crankcases. Crankshaft with 2 - .2187 di. holes in each journal and 1 - .2187 in crankpin EB.3163. Production main bearings (AG.2) and big end bearings (AG.7) R.R. 56 shims. Nelson Bohnalite pistons. Valve springs No.1 - 6 Rm. {William Robotham - Chief Engineer} 260 (Swedish wire). No.7 - 12 EB.175 (S/CV.). EX.18392 det. cylinder head 115 cc 6 : 1 C.R. Std. prod. strengthened exhaust valves to EB.2970 (KE970 stell). Delco Remy ignition distributor. Borg & Beck std. 10" clutch. B-19. Now being assembled to following spec. Standard production crankcase. Up to date prod. crankshaft with 2 - .2187 holes in journal and 2 - .125 holes in pins. Die cast AG.6 main bearings. Billet cast AG.6 big end bearings with single centre holes as production. Camshaft in low carbon steel. Rockers with W/M bores, replacing std. bronze bu hes. Std. deturbulated cylinder head 6.3 : 1 C.R. Nos. 1 - 6 valve springs std. EB.175 S/CV. Nos 7 - 12 " " Rm. {William Robotham - Chief Engineer} 260 Swedish. | ||
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).