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 and component specifications for various units, including spare parts.
| Identifier | ExFiles\Box 155\2\ scan0153 | |
| Date | 3rd September 1937 | |
| 2. G.10 (Small bore) continued. RB.{R. Bowen}815. EB.1746 1.3 exhaust valve, EB.164 inlet, 1.4 dia. 104ccs. 6.32:1 C/R.{Sir Henry Royce} 1g carbs. S.U. Standard 20/25. WF. R.R. flywheel and clutch G.15 (22.G.V.) Std. unit other than the following - R.M.56. big end bearings and shims. Oil jet holes in connecting rods. Deturbulated head 5.8:1 comp. ratio. Delco governor to suit head. Intermediate main bearings have continuous grooves. Extra hole in each crank journal. Small bore lg induction pipe. AC. oil filter between main pressure and rocker feed. G.17. Standard production 25/30. unit other than - RM.{William Robotham - Chief Engineer}56 bearing shims. Front 8 water holes between the block and head blanked up. Deturbulated head Dec.5002 - 5.86 : C/R.{Sir Henry Royce} Standard valves E.60892 inlet 1.4 dia. E.61075 exhaust 1.225 dia. Modified governor, Bentley frame and 25.HP. spring. Borg and Beck clutch (No.26) 25/30. pistons with L.section and. compression rings. Special hardened pimin gears at RHC{R. H. Coverley - Production Engineer}'s request. 6 Rm.{William Robotham - Chief Engineer}260 springs and 6 Rb.{R. Bowen}3256X. W.7.Z. (Spare Unit) 20/25 crankcase modified to suit large bore, non-spread centres. Whitemetal main bearings. 20/25. crankcase and balance weights, DGF.E.60345. Modified to suit Borg and Beck clutch. Latest type drilled up rods DGF.E.1806, with whitemetal big ends. Aerolite pistons L.4. Standard 20/25. cyl.head (non turbulent) and valves. .075" liner under cyl. block, bringing C/R.{Sir Henry Royce} to 6:1. Stromberg downdraught carburetter and EX.18316 inlet manifold (1st. stage sloping base hot-spot) 11" type ventilated clutch, Borg and Beck. | ||