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).
Ignition timing advance curves for the Wraith and Bentley V models.
| Identifier | ExFiles\Box 168\3\ img137 | |
| Date | 13th April 1939 | |
| -3- 13.4.39. DW.426. (Wraith) Advance degrees. Speed R.P.M. 0° - 125 - 150. 1° - 150 - 190 2½° - 275 - 330 4½° - 450 - 525 9° - 650 - 725 12° - 900 - 1000 14° - 1100 - 1200. Full advance - 14° - 15°. ***************** DB.{Donald Bastow - Suspensions}228/ (Bentley V). Advance degrees. Speed R.P.M. 0 - 125 - 150. 1° - 135 - 170. 3° - 220 - 280. 6° - 400 - 470. 9° - 640 - 750. 12° - 1120 - 1380. 13½° - 1500 - 1750. Full advance 13½° - 14½°. ***************** Hm{Capt. W. Hallam - Head Repairs}/KC. | ||