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).
Performance data table for a deturbulated Bentley cylinder head.
| Identifier | ExFiles\Box 86\1\ scan0191 | |
| Date | 20th March 1936 guessed | |
| BENTLEY DEVELOPMENT Cylinder Head Hs.{Lord Ernest Hives - Chair} 2118 EB. 615 Deturbulated. R.P.M. | B.M.E.P. | C B.H.P. 4500 | 74.7 | 95.2 4250 | 86.7 | 104.3 4000 | 94.4 | 108.9 3750 | 101.3 | 107.7 3500 | 107.5 | 106.5 3000 | 115.2 | 97.7 2500 | 119.5 | 84.5 2000 | 122.2 | 69.1 1500 | 119. | 50.6 1000 | 113. | 32. 750 | 111.2 | 23.5 | ||