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).
Technical bulletin regarding breakages of Cam balancer springs and detailing the specifications for 20/25 HP and Bentley types.
| Identifier | ExFiles\Box 131\3\ scan0122 | |
| Date | 22th August 1939 | |
| 1113 Hd.{Mr Hayward/Mr Huddy} c. M.{Mr Moon / Mr Moore} c. Levallois c. E.{Mr Elliott - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux} (K) CAM BALANCER SPRINGS Several breakages of Cam balancer springs have occurred, particularly on Bentley cars. It has been impossible to detect any material fault in the springs which have broken, but as the 20/25 HP and Bentley springs are so much alike to look at, it is thought that they may have got mixed up, in which case the lower poundage 20/25 HP. spring might bounce if fitted to the Bentley. The following particulars of the two types of springs should therefore be noted in order to avoid any confusion. Type Part No. Poundage Free length 20/25 HP. E.59706 32 lbs. 1.157 Bentley EB.1116 41 lbs. 1.240 Actually, the only difference is in the free length, so it is easy to get them mixed. Mx{John H Maddocks - Chief Proving Officer}/SB{Mr Bull/Mr Bannister}58 | ||