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).
Test bed report and specification for the B.60 Unit No.4, prepared for a 15,000-mile test on a B.B.50 chassis.
| Identifier | ExFiles\Box 111\3\ scan0081 | |
| Date | 27th April 1939 | |
| Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}27.4.39. UNIT TEST OF 15,000 MILES B.60 UNIT NO.4 FOR B.B.50 CHASSIS. The following is a test bed report of the experience on this unit in preparation for the 15,000 miles test. SPECIFICATION. The special features incorporated in this I/C engine are:- (1) 2.75 dia. journal crankshaft (.4 carbon) which includes R.R. layout of balance weights, simplified oil feed drillings (diagonal) which delete the necessity of plugs etc. and 3 holes in each intermediate journal. The above compares with the following original crankshaft specification:- 2.5 dia. journals (VCM), Packard type weights, std. R.R. continuous oil flow through crank and 2 holes per journal. (2) Wraith type of spring drive and combined damper wheels fitted outside the wheelcase by necessity, as against the designed harmonic damper, solid drive. (3) Latest 3-layer Vandervell main bearings strip type (2.75 dia.) with loose BZ/L thrust washers. (4) Wraith split skirt pistons with tin plated rings. (5) Cylinder bores - Nos. 1 and 2 solid bores. Nos. 3 and 4 with Hichrome short inserts. Nos. 5 and 6 with Brivadium " " | ||