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).
Data table specifying maximum clearances and velocities for quiet cam operation.
| Identifier | ExFiles\Box 102\5\ scan0155 | |
| Date | 11th December 1933 guessed | |
| SHEET 1. | CAM. | | MAX. CLEARANCE FOR QUIET CLOSING INCHES. | CLOSING VELOCITY INS/DEGREE. | MAX. CLEARANCE FOR QUIET OPENING INCHES. | OPENING VELOCITY INS/DEGREE. | |-----------|-------|------------------------------------------|------------------------------|------------------------------------------|------------------------------| | Cyl No.1 | Inlet | 0.0025 | 0.000415 | 0.0050 | 0.000557 | | | Exh. | 0.0020 | 0.000296 | 0.0040 | 0.000453 | | Cyl No.2 | Inlet | 0.0010 | 0.000379 | 0.0060 | 0.000565 | | | Exh. | 0.0045 | 0.000568 | 0.0060 | 0.000758 | | ||