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).
List of engineering specifications for various engine components including the crankshaft, flywheel, and camshaft.
| Identifier | ExFiles\Box 126\4\ scan0185 | |
| Date | 15th September 1937 guessed | |
| - 3 - One tappet side there are no core supports, neither are there any on underside on top. Clutch Casing. See sketches V, Vl{V. Lewis / Mr Valentine} and Vll. Front Crankshaft Bearing Cap. See sketch Vlll. Main bearings white metalled on thin steel sheets .064 thick. Timing Case. See sketch lXA. Crankshaft. Solid - machined on pins and journals only. Balance weights solid on all webs. (not opposite to crankpins - Packard positions). Narrow webs 7/8" wide x 3.1/8" Flywheel. (See sketch lX.) Flywheel 12.5/8" dia, I.C. Approx. dia. of starter ring = 13.15/16 Rocker Shaft. Rocker shaft is .781 dia. in two lengths. Rockers and pedestals are steel forgings. Push rod adjustment - see sketch No. Xll. Rocker Cover. 3/16" Cork joint between rocker cover and head. Steel sheet pressing .036 thick, ribbed for stiffness. Ribs .100 deep. Approx. depth of cover is 4¼" 25" long x 5¼" inside. Held down by two cap nuts. 3 Vent slots in top 1" long x .125 wide. See sketch X. Camshaft - forged steel. 3 Bearings. (1). 1.13/16" dia. x 1.27/32 long. (2). 1.25/32" dia. x 2.1/16" long. (3). 1.5/8" dia. x 1.3/8" long. Machined only on bearings and cam profile only. Oil pump and distributor driven by skew gear in middle of centre camshaft bearing. Skew gear approx. 1.000 o/dia. See sketch Xlll. Camshaft Driving Wheel is made of Canadian Westinghouse Micarto (Fabroil type material). O/C. & mating with steel pinion on crankshaft. Gears are 7/8" wide. Approx. .325 pitch of teeth, and 20° spiral angle. | ||