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).
Test report detailing temperature readings taken from a cylinder wall using a thermocouple setup.
| Identifier | ExFiles\Box 65\4\ scan0351 | |
| Date | 1st October 1926 guessed | |
| contd :- -2- ARRANGEMENT OF THERMO COUPLE. Diagram Labels: CYL. WALL, Ni, Fe, GALVANOMETER, THERMOMETER, COLD JUNCTION Temperature readings were taken at the following places :- A.{Mr Adams} 1.875" from the top of the cyl. bore B. The top of the cyl. skirt - not water cooled. C. The bottom of the skirt. The engine was run at 2500 r.p.m. at about 3/4 full load or developing about 78 HP. The total heat flow to the cool- ing water would be somewhere about 4000 B.T.U's/min. but no actual readings were taken at the time of the test. The compression ratio was 4.1 to 1. The following results were obtained and the diagram shews more clearly the places where the temps. were recorded :- Pos_n | R.P.M. | Approx. H.P. | Wall temp. °C | Average water temp.°C | Oil temp.°C A.{Mr Adams} | 2500 | 78 | 80 | 75 | 70 B. | 2750 | 68 | 126 | 75 | 71 C. | 2500 | 78 | 121 | 75 | 68 Diagram Labels: CYL. BORE., A, B, C The thermal conductivity of cast iron being usually taken as .037 per B.T.U/min/sq.in/ °F, the thickness of the metal being .2" and having to pass about 9 B.T.U's per contd :- | ||