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).
Experiments to mitigate a cylinder knock by fitting a steel sleeve over the cylinder skirt, including a blueprint diagram.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan005 | |
| Date | 1st October 1925 guessed | |
| contd :- -5- The above experiments were sufficient to shew us that the cylinder block was a contributing factor and it was therefore thought advisable to direct our attention to this as a possible means of eliminating or mitigating the trouble. A steel sleeve was shrunk over one of the cylinder skirts which extended the whole length (see sketch). This arrangement proved to be very satisfactory and the knock which was previously very evident was practically eliminated except for a very slight trace which could only be heard when using a 'sounding rod' on the skirt. If this arrangement were employed it would be necessary to enlarge the bore in the crankcase to allow for elongation of the crankcase with temperature. It was desired, if possible, to try a similar method without having to resort to any alteration of the existing crankcase, therefore some cylinder blocks were prepared with thicker section skirts which extended only 2" from the bottom. This required no alteration to the crankcase. The reason for shortening the length of the stiffened section was to discover the amount of stiffening necessary to obtain the desired quiet operation. contd :- Blueprint Text: DIAGM. I CYLINDER .175 .300 STEEL SLEEVE SHRUNK OVER CYL SKIRT | ||