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 specifications for various engine components, modifications, and test configurations.
| Identifier | ExFiles\Box 155\2\ scan0177 | |
| Date | 20th December 1937 | |
| -3- Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 1/JH.20.12.37. Std. No.1, 2 and 3 exhaust valves EB.2970 (KE.965). No.4,5 and 6 " " EX.26652 (KE.965) with "Brightray" seats in place of normal "stellite" 45° angle timing gears. B. & B. clutch with Thermoid linings. Large capacity production pump. B.20 (5.B.IV). Strengthened alum. crankcase with 4-bolt fixing of rear main bearing EX.23035. Special crankshaft with standard width pins to suit EX.23036. Main and big end bearings in standard Hall's metal AC.7 Old std. single holes in journals and pins. Cyl. block by Mid.Cyl.Co. Standard Aerolite pistons and rings .020. Deturbulated cylinder head LeC.5022 6.5 : 1 C.R. Delco-Remy ignition governor to suit head. B.23 O.H.C. Silencer tests on No.2. Bed. O.H.C. conversion units. Other than head and block is a standard unit. Compression ratio 6.3 : 1. External ex. cam balancer. Closely coiled valve springs in "Swedish wire" made by the Tempered Spring Co. B.24. 6.B.IV 15,000 miles car. Std. crankcase but in L5 alloy. Centricast A.C.6 main bearings R.R. 56 shims Brinall 58-72. | ||