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).
Heat distribution diagram for a Bentley engine unit.
| Identifier | ExFiles\Box 131\1\ scan0133 | |
| Date | 18th February 1934 | |
| HEAT DISTRIBUTION IN BENTLEY UNIT UNIT No. B.6 COMPRESSION RATIO 6.9:1 SPECIFICATION - RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel} 9/AP. 6-12-33 ENGINE DEVELOPING 99.5 B.H.P. WITH TEST BED EXHAUST SYSTEM. TEST RUN AT 4000 RPM WITH MIXTURE AT WEAKEST MAINTAINED. FUEL USED D.T.D. 224 OIL USED:- MOBILOIL 'D'. SPECIFIC HEAT AT 100°C = .446 SPECIFIC GRAVITY AT 100°C = .848 TOTAL FRICTION & PUMPING LOSSES 1540 BTUs/MIN TOTAL HEAT GIVEN TO WATER 3465 BTUs/MIN HEAT CARRIED AWAY BY OIL = 210.2 BTUs/MIN TOTAL AREA REPRESENTS INITIAL FUEL ENERGY 18,300 B.T.Us/MIN = 100% EFFECTIVE MOTOR POWER 4220 BTUs/MIN. 23.1% EXHAUST & RADIATION 10,092 BTUs/MIN 55.1% RADIATION FROM PISTONS HEAT CARRIED AWAY BY OIL = 63.1 BTUs/MIN = .345% PISTON FRICTION ACCOUNTED FOR IN WATER = 1080 BTUs/MIN = 5.9% BEARING FRICTION ETC. HEAT CARRIED AWAY BY OIL = 147.1 BTUs/MIN = .805% HEAT INPUT TO OIL HEAT PICKED UP FROM HOT PISTONS: 63.1 BTUs/MIN HEAT SUPPLIED DUE TO BEARINGS: 123.4 BTUs/MIN HEAT SUPPLIED BY OTHER SOURCES, PUMP, CAMS, ETC.: 23.7 BTUs/MIN HEAT PICKED UP FROM PISTONS ASSUMED AS 30% OF TOTAL HEAT TO OIL TOTAL OIL FLOW = 28.95 LB/MIN MAIN OIL PRESSURE 29.5 LB/□" OIL FLOW THROUGH BEARINGS = 10.2 LB/MIN B.V. 18 ROLLS ROYCE, LTD PRINT ROOM 18 FEB 1934 DERBY R.H.C. 26-1-34 | ||