Graph showing exhaust valve contraction over time for a 4 1/4 Litre Bentley (O.H.C) engine, comparing different valve configurations.
| Identifier | ExFiles\Box 113\5\ scan0188 | |
| Date | 19th February 1937 guessed | |
| UNIT N° B.23 S 18 4 1/4 LITRE BENTLEY (O.H.C) EXH. VALVE TEMPS. AND EXPANSION. COMP. RATIO 6.5 : 1 ETHYL" "PETROL ① R.S. 203 EXHAUST VALVE (SODIUM FILLED) N° 5 CYL ② AS ① WITH SODIUM REMOVED ③ R.S. 203 EXHAUST VALVE (SODIUM FILLED) N° 6 CYL OPEN EXHAUST. MAX. TEMP. = 680°C MAX. TEMP. = 680°C MAX. TEMP. = 740°C CONTRACTION IN INCHES. TIME IN SECONDS. C.T.S | ||
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).