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.80 No.4 Unit, including special features and test conditions.
| Identifier | ExFiles\Box 155\2\ scan0323 | |
| Date | 25th May 1939 | |
| 1315 To Rm.{William Robotham - Chief Engineer} c.c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/Swd18/JH.25.5.39. PROGRAMME OF TEST BED WORK. Further to memo. Rm{William Robotham - Chief Engineer}/Swd1.5/MH.{M. Huckerby}16.5.39. B.80 No.4. Unit. New unit now being assembled for test prior to being fitted in 4.B.50. chassis for 15,000 miles test. Special features include. (1) 2 3/4 dia. journal crankshaft. (2) Vandervell W/M main bearings. (3) Solid stem exhaust valves. (4) Short duration camshaft EB.4512. After running in the following tests to be carried out - (1) Power curve (previously found best valve timing) both open exhaust and with exhaust silencer intended for car or similar set up (Give back pressure). (2) Oil consumption of 1 hr. at 4,000 r.p.m. repeat if in excess of 2 pts/hr. (3) Detonation and ignition advance tests under conditions (a) Exhaust silencer as in (1). (b) Redline fuel. (c) Weakest maintained max. power consumption. (d) Outlet water temp. 80°C. (e) With Air silencer. Before losing the engine it should be ensured that the governor has right characteristic. (4) Ensure that induction system giving the best distribution is fitted and the carb timed to suit complete with air silencer. | ||