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 engine component specifications and modifications.
| Identifier | ExFiles\Box 155\2\ scan0134 | |
| Date | 30th June 1937 | |
| -6- Std. No.1,2 and 3 exhaust valves EX.2970 (KE.965) " " No.4,5 and 6 " EX.26652 (KE.965). with "Brightray" seats in place of normal stellite. 45° angle timing gears. Large capacity production pump. B-20 1.H.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 6.3 : 1 C.R. Deleo-Remy ignition governor to suit head. B-21. B.35.AR. Silver soldered gallary pipe and oil feed pipe joints. + 1/4 clearance on main and big end solid Hall's bearings. Lower half with floatonamber oil replenishing scheme and non-swill flaps. Cylinder block .003" oversize radiused at base of barrels Rm.{William Robotham - Chief Engineer}111. Strengthened Aerolite pistons (cross crown webbing) - Fl type. Turned rings to suit oversize bores. EX.22594M head 78 cc's 9:1 C/R.{Sir Henry Royce} Corrujoint 3-ply gaskets .030 thickness. Cylinder head includes low spark plug position, improved water passages. 1.4 standard dia. exhaust valves (K.E.965 stellited). 1.6 " " inlet " (K.E.965) Front & water holes blanked up in head. Strengthened and better fitting top spring washers. Rm.{William Robotham - Chief Engineer}53 valve springs, not enamelled (polished). 1 7/8" bore inlet pot. 2 1/8" S.U. carburettors with induction system to suit. 1 1/4" mian bore, 1" branches with increased length of buffer ends, .75" bore balance washer. Increased capacity exhaust manif ld Rm.{William Robotham - Chief Engineer}73. Borg & Beck Clutch with strengthened spring No.1b. Special RR governor to suit ignition advance with high compression ratio. | ||