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).
Performance graph comparing a 110.5° camshaft and a 120° camshaft with different tappet clearances.
| Identifier | ExFiles\Box 102\5\ scan0146 | |
| Date | 13th December 1932 guessed | |
| J III COMPARISON OF 110.5° CAMSHAFT & 120° CAMSHAFT MADE WITH TWO EXHAUST CAMS 5.5 C/R 1.050 CHOKES OPEN EXHAUST NO AIR INTAKES CARBS TO LEC. 2924 CURVE ① TAPPET CLCE .006 CURVE ② TAPPET CLCE .013 RM{William Robotham - Chief Engineer} J8 B H P B M E P LBS / □" R.{Sir Henry Royce} P. M Diagram 1: ① Ex IN .020 CLCE 7° 40° 41.2° INLET DURN 213° EXHAUST " 228° Diagram 2: ② Ex IN .020 CLCE 8° 8.5° 48° 42.5° INLET DURN 227° EXHAUST DURN 228° | ||