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).
Blueprint comparing three cam forms and four alternative engine valve timings.
| Identifier | ExFiles\Box 13\2\ 02-page164 | |
| Date | 18th April 1932 | |
| SHEET II JAPAN III T.D.C 8° EX 48 IN 45° .020 CLCE TOE OF INLET CAM TO BE SHORTENED AS FAR AS POSSIBLE INLET DURN 228 EXHAUST DURN 233 110° SHAFT PEREGRINE 3 8 EX 45 IN 42 .020 CLCE INLET DURN = 180+42=222 EXHAUST " " = 180+52=230 T.D.C 8 EX 50 IN 42 .020 INLET DURN = 230 EX. DURN = 230 BENSPORT T.D.C. 10 EX 55 IN 45 .020 CLCE INLET DURN 180+52=235 EXHAUST " " 180+55=235 T.D.C 10 EX 55 IN 40 .020 THIS ALMOST EXACTLY REPRODUCES THE ALFA INLET = 235 EX. = 230 THREE CAM FORMS GIVE FOUR ALTERNATIVE TIMINGS. | ||