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).
Valve timing diagram for a 12-cylinder engine, showing angular positions and keyway reference.
| Identifier | ExFiles\Box 169\4\ img203 | |
| Date | 24th May 1932 guessed | |
| HS{Lord Ernest Hives - Chair} 635 X 1.250 DIA F.100 361/2 IS TO E100111 ENGINE C/L OF KEYWAY 1 EX 3 IN 5 EX 6 IN 12 IN 3 EX 6 EX 4 IN 2 EX 11 IN 1 IN 4 EX 5 IN 105 1/2° 60° 3° IO 7E IC 35L EO 40E EC 9.5L | ||