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).
Specifications for Bentley engine units II No.19, II No.20, and B.23 OHC.
| Identifier | ExFiles\Box 155\2\ scan0261 | |
| Date | 11th November 1938 | |
| -6- Bentley II No.19 Unit (3.B.IV). Std. production crankcase and shaft. Die cast A.C. 6 main and big end bearings. EB.3240 - M series camshaft. Rockers with W/M bores. Increased inlet port cylinder head. Induction system to suit Valve springs C/CV - 1 - 6. Swedish 7 - 12. 45° angle timing gears. Bentley II No.20 (5B rig chassis). Strengthened alum crankcase with 4 bkt. fixing of rear main bearing. Main and big end bearings A.C.7. Obsolete single holes in pins and journals. Cyl. block by Mid. Cylinder Co. Std. Aerolite piston and rings. Std. cyl. head and valves 6.4 : 1 ratio. Delco distributor. B.23. OHC (Test bed unit). O.H.C. conversion unit. A.C. 7 main bearings with rear in W/M.{Mr Moon / Mr Moore} Hykro crankshaft. A.C. 7 big end bearings. 6.3 : 1 comp. ratio. Sodium filled exhaust valves. | ||