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 document detailing the specifications for plungers and springs for R.R. and Cadillac models.
| Identifier | ExFiles\Box 106\5\ scan0070 | |
| Date | 23th September 1932 guessed | |
| R.R. Dia. of Plunger .5238 dia. dia. of Casing .5252 " Clearances. .0014 " Plunger Valves. Valve Spring Load (Valve closed) 3.0 ozs. Spring Details Mean dia. of Coils = .137 No. of Coils :- 11 working and one at each end ground flat making 13 in all. Dia of Wire = .0124 (30 S.W.G.) Free Length = .675 Compressed to .375 Material. BZ/PD Plunger Return Springs. Mean dia. Coils = .336 No. of Coils 7 working and one at each end ground flat making 9 coils in all. Dia. of Wire = .036 Material = S/CS Cadillac. Dia. of Plunger .6234 dia. Dia. of Casing .6246 " Clearance .0012 " Valve Spring Load (Valve Spring) .625 ozs. Spring Details Spiral mean dia. small end = .206 mean dia large end = .396 No. of Coils :- 16 working and one at each end ground flat making 18 in all. Dia. of Wire. = .0135 (29 S.W.G.) Free Length. = 1.250 Compressed to .900 Material Steel Plunger Return Springs. Mean dia Coils = .566 No. of Coils. 3½ working and one at each end Ground flat making 5½ coils in all. Dia of Wire. = .043 Material - Steel. Hs{Lord Ernest Hives - Chair}/R.Matthews. | ||