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).
Description of a piston and combustion chamber design with reference to Letters Patent 505895.
| Identifier | ExFiles\Box 147\2\ scan0182 | |
| Date | 21th December 1939 guessed | |
| chamber is arranged in manner described with reference to Figures 2, 3 and 4 of Letters Patent 505895. The protuberance F is formed on the crown of the piston B shaped in plan as shown in Figure 4, which also shows the shape in plan of the combustion chamber E.{Mr Elliott - Chief Engineer} The top of the protuberance F is cut away so as to incline it slightly toward the centre of the combustion chamber. It will be seen that the protuberance F leaves only a small clearance between itself and the vertical walls of the combustion chamber where these overlap the cylinder bore and spring from the projecting portions C of the cylinder head, that is to say to the left of the points marked "Y" in Figure 4 ; and elsewhere, that is to say to the right of the points marked "Y" only a small clearance is left between the walls of the protuberance F and the walls of the cylinder bore. The construction has the same effect as described in Figure 1 of masking at top dead centre the gases in the combustion chamber from those in the space between the projecting portion C of the cylinder head and the crown of the piston B. As in the previously described example the 7. | ||