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).
Data tables comparing engine heat flow and horsepower with clean vs. carbonised engines, and with aluminium vs. cast iron pistons.
| Identifier | WestWitteringFiles\K\September1923\ Scan30 | |
| Date | 1st September 1923 guessed | |
| SHEET 5. CLEAN AND DIRTY ENGINE - CAST IRON AND ALUMINIUM PISTONS. EFFECT OF CARBON DEPOSIT ON HEAT FLOW TO COOLING WATER. COMPRESSION RATIO FOR THESE READINGS 3.9. Carbonised engine. R.P.M. | HP. | Ht. flow to jackets. B. Th. U's. min. 500 | 21.87 | 1328.4 750 | 32.38 | 1912.5 1000 | 43.5 | 2079.0 1250 | 53.9 | 2608.0 1500 | 62.7 | 2948.0 1750 | 69.6 | 3307.0 2000 | 73.3 | 3654.0 Clean engine. HP. | Ht. flow to jackets. B. Th. U's. min. 23.1 | 1660 33.6 | 2250 45.4 | 2970 56.7 | 3167 66.2 | 3402 74.7 | 3780 77.3 | 3982 HEAT FLOW WITH CAST IRON AND ALUMINIUM PISTONS COMPARED. Alum. pistons. R.P.M. | HP. | B. Th. U's. min. 500 | 23 | 1475 750 | 34 | 2025 1000 | 45.5 | 2300 1250 | 55.5 | 2780 1500 | 67.0 | 3060 1750 | ---- | 3380 2000 | ---- | 3980 Cast iron pistons. HP. | B. Th. U's. min. 22.3 | 1413 34.25 | 1925 45.7 | 2310 57.1 | 2745 67.2 | 3100 73.4 | 3440 97.7 | 3600 Note :- Carburutter for each of these readings was the same viz. set for normal running. | ||