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).
Technical specifications and valve timing data for an Alfa Romeo engine.
| Identifier | ExFiles\Box 124\5\ scan0083 | |
| Date | 8th July 1932 guessed | |
| A L F A R O M E O.{Mr Oldham} Bore 65 m/m stroke 88 m/m 8 cyls: Normal max revs 5300 Valve head dia. 32 m/m.{Mr Moon / Mr Moore} Valve lift. 7.5 m/m.{Mr Moon / Mr Moore} Valve clearance. .5 m/m Dia. of cam 1.086 over Lift 1.402. Crankshaft. main bearings 55 m/m crank pin 50 m/m webs 13 m/m.{Mr Moon / Mr Moore} Valve Springs. Length free 75 80 32 m/m Dia. 34. 26. 18 m/m.{Mr Moon / Mr Moore} Coils. 10½ 10½ 6 Wire Gauge. 10 12 14 Weights. 23 13 (10 lbs. to 20 m/m) Length of springs when valve is shut 45 m/m.{Mr Moon / Mr Moore} Lift of valve per 7½° of cam rotation. 0. 0. 11. .310" 1. .007" 12. .294" 2. .023" 13. .265. 3. .054 14. ..224. 4. .107 15. .175. 5. .164 16. .118. 6. .215 17. .060. 7. .256 18. .024 8. .287 19. .008 9. .307 20. .004 10. .315 21. -.004 Inlet opens 15° before TDC Inlet closes 50° after BDC. Exhaust opens 50° before BDC Exhaust closes 15° after TDC | ||