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 lift diagram for the Curtiss D12 engine number 252.
| Identifier | ExFiles\Box 43\3\ Scan063 | |
| Date | 12th August 1926 guessed | |
| CURTISS D12 ENGINE N° 252. VALVE LIFT DIAGRAM VALVE LIFT CRANKSHAFT DEGREES T.D.C. B.D.C. EXHAUST INLET E.O. 52° I.C. 34° I.O. 3° E.C. 2° .015" TAPPET CLEARANCE | ||