Cylinder head modifications for the 'Bensport' model, including trepanning and combustion space depth reduction.
| Identifier | ExFiles\Box 86\1\ scan0015 | |
| Date | 28th February 1933 | |
| 8219. To BY. {R.W. Bailey - Chief Engineer} from E {Mr Elliott - Chief Engineer} /JNR. {Charles L. Jenner} c. Wor. {Arthur Wormald - General Works Manager} Hs. {Lord Ernest Hives - Chair} E./JNR. {Charles L. Jenner} 9/HP.28.2.33. re Bensport(Codename for 3 1/2-litre Bentley). We send you herewith: LeC.3393 showing the trepanning of the cylinder head, and the instructions on the drawing release the whole of the valve gear. Will you kindly note when using the standard 20/25 HP. piston E.57122 which is .030" from the top of the cylinder the depth of the combustion space in the head should be reduced from 1.2 to 1.160. E {Mr Elliott - Chief Engineer} /JNR. {Charles L. Jenner} | ||
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).