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 for the cylinder block, crankcase, crankshaft, and pistons.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan072 | |
| Date | 20th December 1927 guessed | |
| contd :- -5- CYL. BLOCK AND CRANKCASE. The cyl. block and crankcase is one castiron casting it is of extremely rigid though heavy construction. It weighs, complete with crankshaft bearings and caps 437.5 lbs. 9 main bearings carry the crankshaft and each bearing is carried in a heavy lateral web extending the full width of the crankcase. Further rigidity is obtained by carrying the crankcase 2.25" below the centre line of the crankshaft. The main bearing oil feed gallery is cast in the crankcase, as also are the branch pipe feeds from this gallery to each main and intermediate bearing; thus eliminating the use of all oil pipes inside the engine. CRANKSHAFT. The crankshaft is of extremely stiff construction, the prinicpal dimensions are given in fig.111. It is made of S.A.E. No.1045 steel, forged, heat treated and ground. It is carried in 9 bearings each 2.5" in dia. The location of the throws is of the 2-4-2 design, the two throws on each end being located at 90° to the four centre throws; this gives a firing order of 1-6-2-5-8-3-7-4. As is shewn in fig.111 the crankshaft is solid, oil feed to the big end bearings being accomplished by drilling through the webs from the adjacent main bearing. The main bearings are whitemetal carried in bronze shells. The crankshaft sprocket is keyed to the crankshaft and held in place by a large nut, it is placed in boiling water before being assembled, to ensure a secure fit. PISTONS. The pistons are of cast iron, are designed for ease of production and simplicity of manufacture. Two rings and one contd :- | ||