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).
List of required improvements and specifications for the Sports Phantom engine and car.
| Identifier | ExFiles\Box 69\4\ scan0344 | |
| Date | 9th October 1927 | |
| REVISED COPY. X.8771 Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BJ. R1/M10.9.27. SPORTS PHANTOM ENGINE. X.8774 X.8771 X.8830 Results not good enough : we must do better before going into production. How? We must lighten and simplify the car, especially body. A 17-tooth axle is absolutely necessary. Use thin oil (Shell super, sperm). Valves - increase springs for 3000 r.p.m., test with oscillagraph. Cams - heavy acceleration - should be 58 divisions duration, and 110° between # 2 present exhausts. Work for 100 BMEP. at 3000 = 170 B.HP. Must have at least 150 BHP. = 90. Increase clutch stop brake. (DA{Bernard Day - Chassis Design}/Hdy{William Hardy} sending particulars). Fill up engine better - say with Stromberg carb. The car must have - Dash reinforced. Steering - new box, larger worm, .9 pitch (N.sch.2431) Louvred bonnet. Do over 90 MPH., and London traffic on top. The body should not exceed 7 cwts. The shape is very good. It is only necessary to construct it strong and light. This weight should include windscreen, cushion wings, steps, lamps, and provision for carrying spare wheel. It must have Ev{Ivan Evernden - coachwork}'s tail design, finishing in horizontal number plate, which design should be registered. Concealed hood should be provided, and metal tonneau cover. R.{Sir Henry Royce} | ||