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).
Programme of test bed work for the B.III No.1 unit, detailing valve head modifications and power comparisons.
| Identifier | ExFiles\Box 155\2\ scan0228 | |
| Date | 14th June 1938 | |
| 13/5 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}14.6.38. PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/MH.{M. Huckerby}21.5.38. NO. 30 BED. B.III NO.1 UNIT (a) bed. (1) Complete the power comparisons that have been taken on the small valve head in various stages for valve seat warpage, these comprising (a) Small valve 1.5 Inlet and 1.3 Exhaust. (b) Standard inlet valve 1.6 dia., port opened up in taper form as Scheme (i) of ECD.704, retaining 1.3 dia. exhaust. (c) As (b) with standard exhaust valve 1.4 dia., port also opened up in taper form. (d) Converted to standard head by machining ports. Above to be carried out open exhaust and with silencer. (e) By when above are complete the 2nd. small valve head will be ready when power comparisons should be taken between the tulip inlet valve 1.5 dia. and the standard shaped valve also 1.5 dia. (f) Before removing the above unit, take with std. silencer and the best type inlet valve, minimum advance for maximum power also advance for non-detonating power on Redline and Shell. Following the above the engine to be removed for fitment of raised crown Aerolite pistons which will give a compression ratio of 6.5 : 1. When ready, power and detonations to be taken in comparison with standard ratio and pistons. | ||