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).
Engine performance test data for aluminium pistons using 50% Benzol fuel with the cut-out closed.
| Identifier | ExFiles\Box 35\2\ scan 196 | |
| Date | 3rd February 1920 | |
| x 2448 3.2.20. C.R. ALUMINIUM PISTONS. R.P.M. | Lbs. | HP. 1000 | 58 | 48 1250 | 56 | 58 1500 | 54 | 67.5 1750 | 50 | 73 2000 | 46 | 76.5 2250 | 40 | 75 50% Benzol Cut-out Closed. | ||