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).
Timing diagram for a Long Durnon 20 HP camshaft, with a comparison to standard timing.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 122 | |
| Date | 23th February 1927 | |
| LONG DURNON CAMSHAFT (20 H.P.) TIMING DIAGRAM (.010 TAPPET CLEARANCE). Large Diagram Labels: T.D.C. I.O. E.C. 6° 8° I.C. 66° E.O. 64° B.D.C. Handwritten Note: THIS CAMSHAFT IS EVOLVED BY INSERTING A 14° WEDGE IN THE STANDARD INLET CAM, & A 6° WEDGE IN THE STANDARD EXHAUST CAM (AT THE POINT OF HIGHEST LIFT), THEN SPACING THE CAMS AT 120° Small Diagram Labels: STANDARD TIMING (.010 CLEARANCE) T.D.C. I.O. E.C. 12° I.C. 44° E.O. 48° | ||