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).
Standardisation and modification of Bentley cylinder heads to increase horsepower.
| Identifier | ExFiles\Box 86\1\ scan0140 | |
| Date | 11th March 1935 | |
| x219 To Sg.{Arthur F. Sidgreaves - MD} & WOF. c. to K.{Mr Kilner} c. to Ey. c. to Hs{Lord Ernest Hives - Chair}/Wd.{Mr Wood/Mr Whitehead} c. to Bn.{W.O. Bentley / Mr Barrington} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KW.11.3.35. Bentley Cylinder Heads. It will be remembered that it was decided to standardise the cylinder head on which the rocker centres had not been altered. Originally this was some 9 H.P. down on EX.2050. We have regained this lost H.P. by trepanning and fitting a larger exhaust valve. The final result, therefore, of this high compression cylinder head and the Aerolite pistons is to give an increase of about 20 HP. at 4,500 revs. over the standard Bentley engine as it is being sold to-day. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Att: Hs{Lord Ernest Hives - Chair}/Wths.3/KW.9.3.35. | ||