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).
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/JNR.{Charles L. Jenner} c. Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer}/JNR.{Charles L. Jenner}9/HP.28.2.33. re Bensport. 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/JNR.{Charles L. Jenner} | ||