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 sheet detailing modifications and components for various Wraith and B.III engine units.
| Identifier | ExFiles\Box 155\2\ scan0226 | |
| Date | 3rd June 1938 | |
| -5- Rm{William Robotham - Chief Engineer}/Twdl.17/JH.3.6.38. Wraith No.8 Unit (25.G.VI) Cont'd.{John DeLooze - Company Secretary} T section 2nd. ring. Original normal section big ends. AC.6 with keyed shims. End thrust plunger on camshaft. Cam balancer removed. Original Fabroil camwheel. RR. No.9 Unit. Up to date unit incorporating AC.6 die cast big end bearings thin section, with flanges (no shims). Original Fabroil camwheel without cam balancer. End thrust plunger fitted. .030 Klinger cylinder head gasket. Balance hole and trap door in front compartment of sump. Spring driven Delco distributor. High oil level indicator. Crank balance weights, flexible flywheel Rm.{William Robotham - Chief Engineer}498 with 10" clutch balanced as assembled. B.III. No.1 (Test Bed). As up to date Wraith incorporating, Main bearings without shims (Mock up) Std. B.III balance weights, i.e. original Wraith type A.C.6 die cast big end otherwise std. i.e. thin section with flanges, no shims. Cylinder head with .100 machined off face with .050 C and A = 6.3 C.R. 2 - 1 1/4 S.U. carbs. Std. B.II Aerolite pistons. B.III camshaft EB.3466. Std. B.II 10" clutch. Balance hole and trap door in sump of front compartment. Delco ignition distributor. B.III No.2 Unit 7.B.V. As B.III No.1 except. Original Wraith type AC.6 big ends thick section and keyed shims. .030 Klinger cylinder head gasket, std Wraith head 6.15 : 1 C.R. | ||