Summary table of cam forms, detailing specifications for various engines.
| Identifier | ExFiles\Box 85\3\ scan0040 | |
| Date | 1st April 1935 guessed | |
| SUMMARY OF R.R. CAM FORMS ENGINE | VALVE LIFT DIAGRAM | CAM FORM | VALVE | DURATION .020 CLCE | DURATION .005 CLCE | AREA UNDER VALVE LIFT CURVE - □ | LIFT MAX | LIFT 1st CHANGE OVER POINT | ACCELERATION AT 1000 RPM - FT PER SEC² (a, a2, a3, a4, a5, a6) | REMARKS PHANTOM I | Sch. 1053 | E 77855 | INLET | 216 | 280 | 57.6 | .429 | -.115 | 717.5, 200, 300, 276.2, 184.3, 691.5 | OLD STANDARD PHANTOM I | Sch. 1089 | E 78298 | EXHAUST | 232 | 300 | 62.6 | .429 | -.109 | .667, 170.3, 255.5, 236.8, 157.9, 644.5 | PHANTOM II | Sch. 1152 | E 82278 | INLET | 232 | 300 | 70.3 | .480 | -.105 | 878.5, 183.2, 275, 255.2, 170.1, 848.5 | HIGH LIFT PHANTOM II | Sch. 1513 | E 82279 | EXHAUST | 240 | 308 | 72.9 | .480 | -.102 | 848, 170, 255.3, 237.6, 158.4, 820 | 20/25 | Sch. 1542 | E 57174 | INLET | 218 | 282 | 56.6 | .400 | -.081 | 929.5, 169.5, 254.4, 235, 156.9, 895.5 | 20/25 | Sch. 1543 | E 57175 | EXHAUST | 233 | 300 | 60.1 | .400 | -.077 | 864, 145.4, 218, 203, 135.2, 834 | BENTLEY | LE C3292 | E 59272 | IN & EX | 235 | 266 | 59.6 | .400 | -.075 | 781, 117, 234, 203, 101.5, 725 | CLOSING TOE LONGER THAN OPENING SPECTRE(Codename for Phantom III) | LE C 3855 | E 85234 | INLET | 230 | 256 | 59.1 | .400 | -.070 | 781, 75.6, 226.8, 204, 68, 762 | HARMONIC DECELERATION SPECTRE(Codename for Phantom III) | LE C 3856 | E 85235 | EXHAUST | 234 | 260 | 60.0 | .400 | -.070 | 766, 72.8, 218.7, 197, 65.7, 774 | PEREGRINE(Experimental Bentley car never produced / Aero Engine) I | LE C4120 | E 86370 | IN & EX | 220 | 246 | 55.7 | .400 | -.078 | 737.5, 83.3, 250, 232.2, 77.5, 743 | AS ABOVE - SHORT DURN PEREGRINE(Experimental Bentley car never produced / Aero Engine) II | LE C3223 | E 100861 | IN & EX | 224 | 250 | 50.1 | .3333 | -.054 | 877, 125.8, 188.7, 163.1, 108.8, 813 | PEREGRINE(Experimental Bentley car never produced / Aero Engine) II | Sch 1597 | E 100361 | INLET | 224 | 290 | 48.6 | .3336 | -.068 | 733, 129.5, 194.5, 180.4, 120.2, 706.5 | CONSTANT DECELERATION J II | Sch 1598 | E 100362 | EXHAUST | 232 | 300 | 51.2 | .3336 | -.066 | 706.5, 120.2, 180.4, 167.9, 111.7, 682 | HARMONIC DECELERATION SYM CAM DWELL ON NOSE GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) | LE C 3255 | E 59140 | INLET | 226 | 248 | 59.4 | .400 | .063 | 1080, 151.7, 227.5, 197.1, 131.4, 1004 | GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) | LE C 3256 | E 59141 | EXHAUST | 234 | 256 | 61.8 | .400 | .061 | 1040, 141, 211.5, 184, 122.6, 969 | 'R' ENGINE | Sch 1069 | E 32381 | IN & EX | 264 | 304 | 91.1 | .570 | -.136 | 934.5, 241, 241, 241, 241, 934.5 | GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) | DES 1739 | E 40041 | IN & EX | 256 | 300 | 85.0 | .523 | -.129 | 886, 90, 395, 395, 90, 886 | 20/25 | Sch 1153 | E 55331 | INLET | 216 | 260 | 47.7 | .344 | -.085 | 673, 172, 215, 198, 159, 647 | 20/25 | Sch 1158 | E 55358 | EXHAUST | 232 | 296 | 50.8 | .344 | -.080 | , , , , , | 'F' ENGINE | Sch 1424 | E 36951 | IN & EX | 236 | 278 | 77.3 | .550 | -.143 | 1009, 271, 338, 312, 250, 969 | SHORT DURN PRODUCED FOR SILENT TAPPETS BENTLEY | LEC 3855 | EB 2256 | IN & EX | 230 | 256 | 59.1 | .400 | .070 | 781, 75.6, 226.8, 204, 68, 774 | | ||
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).