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).
Graph comparing the performance of S.U. and R.R. carburettors.
| Identifier | ExFiles\Box 179b\2\ img113 | |
| Date | 4th October 1932 guessed | |
| COMPARISON OF S.U. & R.R. CARBURETTERS C/R 6.24 INLET VALVE 1.125 R.R. SEMI EXPANDING S.U. 1 5/8 BORE 108 1/4 TIME TO J.C. B.H.P. R.P.M. | ||