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).
Graph showing the effect of different preheating methods on the power and efficiency of a Standard Phantom engine with a 4.1:1 compression ratio.
| Identifier | ExFiles\Box 50\3\ Scan281 | |
| Date | 26th June 1926 guessed | |
| STD. PHANTOM ENGINE. 4.1 TO 1. COMPN RATIO. EFFECT OF PREHEATING BY DIFFERENT METHODS. 750 R.P.M. FULL THROTTLE. BAROMETER. 757 M.M. EXH. SYSTEM WITH CUT OUT CLOSED Y-AXIS: CONSUMPTION. PINTS/B.H.P./HOUR. X-AXIS: B.M.E.P. lbs/□" DATA SERIES LABELS: STD. HOT SPOT HEATING AIR AT 32°C HOT INTAKE AIR ONLY. AIR 80°C STD. HOT SPOT & HOT AIR. 80°C. THE ABOVE CURVES SHEW THE INFLUENCE OF METHOD OF PREHEATING ON POWER & EFFICIENCY. WITH THE STD. HOT SPOT INCREASING THE AIR TEMP FROM 32°C TO 80°C LOWERS THE M.E.P. FROM 95 lbs/□" TO 90 lbs/□". THE SPECIFIC CONSUMPTION FOR MAX. POWER REMAINS APPROXIMATELY THE SAME AT .7 PTS/HP/HR. THE MAX. ECONOMY IS ALSO THE SAME AT .59 PTS/HP/HR. PREHEATED AIR ONLY GIVES LESS POWER AND GREATER CONSUMPTION THAN THE STD HOT SPOT. aCk | ||