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).
Placement and testing of couples within a cylinder bore, including diagrams.
| Identifier | ExFiles\Box 71\2\ scan0169 | |
| Date | 18th October 1926 guessed | |
| contd :- -2- Six couples were used altogether on the pressure side of the cylinder bore and a sketch shews the position of these couples. It will be seen that the top position is just below the level of the piston rings when the piston is at the top of the stroke and the bottom position is about the centre of the rings when at the bottom of the stroke and is never uncovered by the top of the piston. The first readings were taken over a speed range from 500 to 2500 r.p.m. when operating at full throttle with the mixture and synchronised ignitions adjusted to give the max. B.M.E.P. The jacket water temp. was kept at approximately 80°C and the oil at 60°C. Readings were not taken until conditions became steady. contd :- Text from diagrams: Top diagram: STEEL PLUG .187 DIA COPPER DISC COUPLE WIRES FIBRE WASHER WIRES PEENED IN CYL. BORE. LINER 1/4 CYL. WATER SPACE. Bottom diagram: TOP OF CYL. BLOCK. 1.5" 4.35" 6.45" CYL. BORE LINER WATER SPACE. POSN OF COUPLES IN CYLINDER. | ||