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).
Two graphs showing the effect of valve timing on Brake Horse Power for Engine I.G.I.
| Identifier | ExFiles\Box 48\4\ Scan101 | |
| Date | 20th December 1923 | |
| Main Titles: EFFECT OF VALVE TIMING ON POWER BRAKE HORSE POWER Top Graph Section: INLET TIMING. FIXED. EXHAUST VARIED. Y-Axis Values: 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 50 X-Axis Labels: EXHAUST CLOSING: 15° BEFORE, 10°, 5°, T.D.C., 5°, 10°, 15° AFTER EXHAUST OPENING. (DEGREES BEFORE B.D.C.): 30°, 35°, 40°, 45°, 50° Additional X-Axis Scale: 32°, 35°, 40°, 50° Diagram: INLET VALVE TIMING., I.O. 15°, I.C. 53° Bottom Graph Section: ENGINE I.G.I. EXHAUST TIMING FIXED. INLET VARIED. TAPPET CLEARANCES .010" Y-Axis Values: 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 50 X-Axis Labels: INLET OPENING: 15° BEFORE, 10°, 5°, T.D.C., 5°, 10°, 15° AFTER, 20° INLET CLOSING. (DEGREES PAST B.D.C.): 39°, 44°, 49°, 53°, 54° Additional X-Axis Scale: 13°, 20°, 24°, 29°, 34° Diagram: EXHAUST VALVE TIMING., E.O. 45°, E.C. 1° Curve Labels (for both graphs): 500, 750, 1000, 1250, 1500, 1750, 2000, 2250 R.P.M, 2500 R.P.M, 2750 R.P.M, 3000 R.P.M Stamp (Bottom Left): ROLLS-ROYCE LTD. DERBY 20 DEC. 23 Drawing Number (Bottom Right): DRAWING No. I.G.I. 838 | ||