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).
Indicator diagrams showing engine pressure and performance metrics relative to crankshaft position.
| Identifier | WestWitteringFiles\K\December1923\ Scan77 | |
| Date | 20th December 1923 | |
| 40/50 INDICATOR DIAGRAM TDC EC IO EO IC BDC 40/50 110° CAMSHAFT COMPRESSION RATIO 3.9-1 2000 R.P.M. 77.1 H.P. 13° C AIR TEMP. 763 mm BAR. COOLING WATER 80°C I.M.E.P. 91 LBS/SQ" B.M.E.P. 67.4 LBS/SQ" MECHANICAL EFFICIENCY 74% INDICATED VOL. EFF. 84.7% COMPRESSION PRESSURE. 73.1 LBS/SQ" EXPLOSION PRESSURE. 312 LBS/SQ" LBS/SQ" LBS/SQ" RELATIVE TO ATMOSPHERE. CRANKSHAFT DEGREES. FOR PISTON DISPLACEMENT. ROLLS-ROYCE LTD. PRINT ROOM. 20 DEC. 23 DERBY OD. 823 | ||