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).
Table detailing the specifications of various car engines.
| Identifier | ExFiles\Box 127\1\ scan0214 | |
| Date | 9th May 1935 | |
| 4435 9.5.35. PARTICULARS OF CAR ENGINES. TYPE | BORE | STROKE | STROKE/BORE | TOTAL CYLINDER CAPACITY | R.A.C. RATING | WHEEL BASE | TRACK --- Phantom II | 4.250" | 5.500" | 1.29 | 468 cu.in 7668 c.c. | 43.3 | 12'6" | 5'0" 20/25 HP. | 3.250" | 4.500" | 1.38 | 224 cu.in 3670 c.c. | 25.3 | 11'0" | 4'8" Japan I | 3.250" | 4.500" | 1.38 | 224 cu.in 3670 c.c. | 25.3 | 11'0" | 4'8" Japan III | 3.400" | 5.000" | 1.47 | 272 cu.in 4464 c.c. | 27.7 | 11'0" | 4'10" Peregrine | 2.725" | 4.125" | 1.51 | 144 cu.in 2364 c.c. | 17.7 | 10'0" | 4'8" Vulture | 4.375" | 5.500" | 1.26 | 496 cu.in 8131 c.c. | 45.9 | 11'0" | 4'10" SpectreCodename for Phantom III | 3.250" | 4.500" | 1.38 | 448 cu.in 7340 c.c. | 50.7 | 12'6" | 5'0" Wraith | 3.000" | 4.500" | 1.50 | 254 cu.in 4171 c.c. | 28.8 | 11'0" | 4'8" Bentley Large Bore | 3.500" | 4.500" | 1.28 | 260 cu.in 4260 c.c. | 29.4 22.0 | | 12-Cylinder Packard | 3.437" | 4.250" | 1.238 | 473 cu.in | 56.4 | | | ||