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 engine and transmission components.
| Identifier | ExFiles\Box 126\2\ scan0130 | |
| Date | 18th November 1938 guessed | |
| -2- CONNECTING RODS. SS.{S. Smith}207-9. Forged Finish - Steel. Big Ends White Metalled direct in Con.Rod. Big Ends 2.1/8" Dia x 1.13/32" long. Rod Rifle Drilled for Gudgeon Pin Lubrication. VALVES. See SS.{S. Smith}211. Stem Dia 5/16" Inlet and Exhaust. Tappet Clearance .006 Inlet and .010 Exhaust. Head Dia. 1.5/8" Inlet and 1.3/8" Exhaust. Valve Face Angle 45° Inlet and Exhaust. Length of Valves 5.1/4" Inlet and Exhaust. PISTON. SS.{S. Smith}210. Length of Piston = 3.21/32" and 2.1/64" from centre line of Gudgeon Pin to top of Piston. Pin Dia. 15/16". Gudgeon Pin is held in position by 2 Circlips. OIL PUMP. Driven off Camshaft by Spiral Gears. GEAR ON CAMSHAFT. No.of Teeth. = 15. Width 19/32". Helix angle(Approx) = 48°30' R.H. Module 2. GEAR ON OIL PUMP SHAFT. No.of Teeth = 11 Module 2. Helix Angle(Approc) = 45°0' R.H. Width 35/64". OIL PUMP GEARS. No.of Teeth. = 10. Chordal Thickness = .150. Pitch Dia. = 1.100 Addendum = .096 Dia P. = 10. Width. = 1.17/32". Obliquity. = 20° ENGINE MOUNTING. See SS.{S. Smith}224, SS.{S. Smith}225, SS.{S. Smith}226, SS.{S. Smith}227. GEAR BOX. Box is made in C.I. A Four speed box fitted with Synchromesh to 3rd and top. | ||