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).
Comparison of potential 40/50 model configurations, including the New Phantom, with a handwritten note on engine boring.
| Identifier | ExFiles\Box 160\2\ scan0090 | |
| Date | 19th July 1925 | |
| Oy1-E-71825 July 19, 1925. POSSIBILITIES ON 40/50 Axle ratio 13/51 - 3.92 inst. of 3.72 Capacity (4-5/8" bore) - 478 c.in. inst. of 453 Weight Touring from 5000 lbs. to 4850 lbs. Eng.Capy. Comp. Ratio Axle Ratio Wheel Size Touring Car Wt. Dis-place-ment Foot Dis-place-ment Ton Foot Displace-ment Ton Foot corrected Rolls-Royce 478 4.08 3.92 33 4850 108.5 44.75 45.2 NEW PHANTOMCodename for PHANTOM I Rolls-Royce 468 4.12 3.72 33 5300 101 38.15 39.0 [Handwritten Note] H.g. The 4 5/8 bore is a suggestion for service on old cars after the Phantom is put on the market. It does not seem to have any obvious disadvantage as there is plenty of metal in the cyl. casting for boring out 1/16 a side. Oy | ||