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).
Comparative table of various engine specifications and performance data.
| Identifier | ExFiles\Box 133\2\ scan0137 | |
| Date | 27th February 1935 guessed | |
| ENGINE DATA HEADERS: ENGINE | BORE | STROKE | STROKE/BORE RATIO | TOTAL CAPACITY (CU.INS, CC) | VALVE AREA INLET | VALVE AREA EXHAUST | VALVE LIFT | VALVE AREA PER LITRE AT 6.5/1 C.R & 15" DEPN INLET | VALVE AREA PER LITRE AT 6.5/1 C.R & 15" DEPN EXHAUST | MAX B.H.P | MAX B.M.E.P | B.H.P. PER LITRE | GAS VEL' AT MAX B.M.E.P FEET/SEC INLET | GAS VEL' AT MAX B.M.E.P FEET/SEC EXHAUST | GAS VEL' AT MAX B.H.P FEET/SEC INLET | GAS VEL' AT MAX B.H.P FEET/SEC EXHAUST | IN. VALVE AREA / CU.INS 2/3 | REMARKS DATA: PHANTOM II | 4.250 | 5.500 | 1.29 | 468 CU.INS, 7668 CC | 2.685 | 2.096 | .480 | 2.10 | 1.64 | 178 AT 3000 | 117 AT 1600 | 23.2 | 129 | 166 | 242 | 311 | .147 | INLET VALVE 1.900 DIA. 20/25 H.P. | 3.250 | 4.500 | 1.38 | 224 CU.INS, 3670 C.C. | 1.357 | 0.866 | .400 | 2.22 | 1.42 | 85 AT 3000 | 71 AT 1500 | 24.1 | 115 | 180 | 230 | 360 | .123 | J.I | 3.250 | 4.500 | 1.38 | 224 CU.INS, 3670 C.C. | 1.460 | 1.240 | .400 | 2.39 | 2.03 | 118 AT 3200 | 115 AT 2150 | 32.2 | 153 | 180 | 278 | 327 | .130 | J.II | 3.400 | 5.000 | 1.47 | 272 CU.INS, 4464 C.C. | 1.566 | 1.341 | .400 | 2.10 | 1.80 | 122 AT 3500 | 85 AT 2100 | 27.3 | 169 | 197 | 282 | 328 | .123 | PEREGRINE | 2.725 | 4.125 | 1.51 | 144 CU.INS, 2364 CC | 1.062 | 0.922 | .335 | 2.69 | 2.34 | 78 AT 4250 | 66 AT 2750 | 33.1 | 172 | 199 | 266 | 308 | .127 | LARGE INLET VALVE. PEREGRINE | 2.725 | 4.125 | 1.51 | 144 CU.INS, 2364 CC | 0.922 | 0.922 | .335 | 2.34 | 2.34 | 74 AT 4250 | 63 AT 2750 | 31.4 | 199 | 199 | 308 | 308 | .111 | SMALL INLET VALVE VULTURE | 4.375 | 5.500 | 1.26 | 496 CU.INS, 8131 C.C. | 2.995 | 2.096 | .480 | 2.21 | 1.55 | 203 AT 3000 | 128 AT 1800 | 25.0 | 138 | 198 | 230 | 330 | .157 | SPECTRECodename for Phantom III | 3.250 | 4.500 | 1.38 | 448 CU.INS, 7340 C.C. | 1.566 | 1.041 | .400 | 2.56 | 1.71 | 216 AT 3750 | 113 AT 2000 | 29.4 | 124 | 187 | 248 | 373 | .140 | CAMSHAFT HS{Lord Ernest Hives - Chair} 1536 KESTREL I B | 5.000 | 5.500 | 1.10 | 1296 CU.INS, 21250 CC | 3.900 | 2.700 | .475 | 2.20 | 1.56 | 625 AT 3200 (STILL INCRNSG) | 140 AT 2000 | 29.4(+) | 154(+) | 216(+) | 246 | 346 | .172 | CONDOR | 5.500 | 7.500 | 1.36 | 2140 CU.INS, 35000 CC | 4.336 | 4.336 | .460 | 1.48 | 1.48 | 787 AT 2100 (STILL INCRNSG) | 145 AT 1800 | 22.5(+) | 206(+) | 206(+) | 240 | 240 | .137 | NOT CORRECTED FOR DEPN RUDGE MOTOR CYCLE | 3.350 | 3.470 | 1.035 | 30.4 CU.INS, 499 CC | 2.160 | 1.838 | .320 | 4.34 | 3.69 | 33.4 AT 5800 | 165 AT 4500 | 67.0 | 176 | 207 | 227 | 267 | .221 | | ||