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 a B.III No.1 Unit, detailing power comparison and performance improvement tests.
| Identifier | ExFiles\Box 155\2\ scan0193 | |
| Date | 27th January 1938 | |
| 1315 To Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. to Rm{William Robotham - Chief Engineer}/D.Lee. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/JH.27.1.38. PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/WH.3.1.38. No.30 Bed. B.III No.1 Unit. Following initial power comparison with various timings on this unit with existing Wraith head and .010 thick gasket 6.2 : 1 ratio. (1) Compare power loss on Wraith and production Bentley exhaust system. (2) Investigate any improvements that can be made on the existing inlet manifold regarding, power distribution, snap opening and idling. What is the maximum tappet clearance for quiet operation of valve gear and at this setting is slow running any improvement over existing .010 setting? and how does it compare with production Bentley. (3) Carry out ignition advance tests for max. power and non detonation on Red Line petrol. With complete exhaust system, air silencer and correct spark plugs (Bentley type). (4) Fit standard Wraith C & A gasket and recheck power and detonations. (5) Check timing gears for rattle and whether .4 valve lift makes these worse than the .350 lift on Wraith. Try effect of cam balancer with 1 cam plunger removed, 2 removed and all 3 removed. | ||