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).
The B.60 No.1 unit 50-hour endurance test, detailing unit specifications and running conditions.
| Identifier | ExFiles\Box 123\5\ scan0341 | |
| Date | 25th February 1939 | |
| 1044 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} c. Da{Bernard Day - Chassis Design}/McS. B.60 ENDURANCE (NO.1 UNIT). Prior to commencing the 50 hour endurance this unit had run a total of 140 hours development work at all speeds up to 4250 r.p.m., 90 hours being at full throttle. At the time of dismantling after the endurance, therefore, the total running time of the unit was 190 hours. The following features were included in the unit during the endurance. Unit Specification. Packard weight crankshaft. R.R. whitemetal main bearings and obsolete thick section big end bearings (AC.7). Aerolite pistons flush with top of cylinder bores. Cylinder head with increased throat area PD.292. Compression ratio with .030 Klinger gasket 6.4 : 1. Bentley V 2 S.U. induction system. Sodium cooled exhaust valves. Part time with R.R. harmonic damper and part with adapted Studebaker damper. Short duration camshaft (EB.2468) in S/ZN. with bronze distributor gear. Ph.III double inlet valve springs. Conditions. Regarding the conditions under which the engine was run, these were as follows. Each hour divided into (a) 20 mins. at 3000 r.p.m. (b) 20 mins. at 3500 r.p.m. (c) 20 mins. at 4000 r.p.m. Each 10 hours divided into (a) 7 hrs. at full throttle. (b) 2 hrs. at 2/3 load. (c) 1 hr. at 1/3 load. | ||