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 camshaft, valves, and related engine components.
| Identifier | ExFiles\Box 126\1\ scan0067 | |
| Date | 24th January 1938 | |
| - 4 - CAMSHAFT (Cont'd). Cams have slight taper to ensure rotation of tappets. Supported in 4 bronze bushings (probably pressed in and burnished in position). Camshaft End thrust taken by hardened plunger and spring on hardened thrust plate which is spot welded to the wheelcase cover. Oil Pump and distributor driven by skew gears in centre of camshaft. Camshaft drive by 1" "Morse" silent chain. CAMSHAFT SPROCKET. Width of sprocket 1.1/32. Approx. pitch of Teeth .325. No. of teeth 36. CAMS. Cam base circle 1.312 dia. Cams .500 wide. Cam lift .300. VALVES. See Ex.S.401. Spring Dampers fitted (A similar scheme has been done for Wraith). Tappets. Mushroom with spherical face. Valve Guides, are pressed in to a gauge and have no keys or dowels. See Ex.S.369. Inlet Head dia. 1.9/16. Exhaust Head dia. 1.27/64. Stem Dia. Inlet .3425 Exhaust .3415 Stem Clearance in Guides. Inlet .0012 - .0032 Exhaust .0022 - .0042 Tappet Clearance. Inlet .008 Exhaust .011 Valve Face Angle. Inlet 30° Exhaust 45° Exhaust Valves 5.51/64 long. Inlet 5.51/64 " | ||