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).
Positioning of couples in a cylinder and the parameters for engine testing, including diagrams.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan060 | |
| 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 maximum B.M.E.P. The jacket water temperature was kept at approximately 80°C and the oil at 60° C. Readings were not taken until conditions became steady. contd :- Text from top diagram: STEEL PLUG. 187DIA COPPER DISC CYL. BORE. LINER FR. CYL. WATER SPACE COUPLE WIRES FIBRE WASHER WIRES 'PEENED' IN Text from bottom diagram: TOP OF CYL. BLOCK. POSN OF COUPLES IN CYLINDER. 1.5" 4.33" 6.45" CYL. BORE LINER WATER SPACE | ||