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).
Specifications and modifications for engine units B.60 No.2, B.III No.4, and B.II No.15.
| Identifier | ExFiles\Box 155\2\ scan0260 | |
| Date | 11th November 1938 | |
| -5- B.60 No.2 Unit (later to be fitted in chassis). Crankcase front mounting and rear end modified to suit altered position of rear flange. Camshaft C/2H gear reduced .020 to minimise interference with distributor drive gear. On this and future engines all cam bearings are the same diameter. All exhaust valve seats cut in cylinder block. C.65 inlet valve seats. B.T.C distributor drive gear and lubrication as No.1 unit. General oil filter. Up to date Wraith thin section big ends (Dia. cast A.C.9 with jet holes in rods. B.III No.4 Unit. (Spare test bed unit). A.C. 9 main bearings. No.1, 3, 5 and 7 die cast No.2 4 and 6 centri cast. New crank (turned finish on webs). No.1, 3 and 6 big ends centri cast A.C.9. No. 2, 4 and 6 big ends die cast. No.1 and 2 little end bushes .00025 external clearance. No. 5 and 6 little end bushes .0005 external clearance. .35 chrome cylinder block. Inertia damper Rm.{William Robotham - Chief Engineer}252 with solid centre. B.II No.15 Unit (B.56.BN{W.O. Bentley / Mr Barrington}). AC.7 main bearings with W/M rear crankshaft with 2.218 dia. holes in journals and 2 in pins, 1 - 125 dia. and 1 - .218 dia. AC.7 big end bearings. 45° angle timing gears. KE965 valves in No. 4 and 5 and 6 cyl. exhaust. Stell Cil.X valves in No. 1 and 2 and 3 exhaust. Std. aerolite pistons but with high pressure rings. Delco distrubor. | ||