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).
Note with a diagram discussing cam duration, lift, and angle between cams.
| Identifier | WestWitteringFiles\K\July1923\ Scan17 | |
| Date | 12th July 1923 guessed | |
| (2) E 5 11 I .010 CLEARANCE ANGLE BETWEEN CAMS = 105 1/4° I 32 45 E we actually have to make a cam with a shorter duration of lift than Lec.1050. at 10.m. clearance. I also find that we have to make an inlet cam to give a shorter duration of lift than Lec.1048. If you know of any explanation for this fairly considerable difference between what the engine is, and what it should be, would you kindly let us know at the earliest possible moment. E.{Mr Elliott - Chief Engineer} [Signature] | ||