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 and data table showing the exhaust valve lift curve, including velocity, acceleration, and timing diagrams.
| Identifier | WestWitteringFiles\W\September1931-November1931\ Scan001 | |
| Date | 12th June 1934 | |
| SCH.1089 TITLE: EXHAUST VALVE LIFT CURVE (S.S.) MAIN GRAPH LABELS: VALVE LIFT VELOCITY ACCELERATION PRESENT EXHAUST VALVE LIFT CURVE As Per SCHEME 1053. AXIS LABELS: Vertical Left Y-Axis: HEIGHT OF VALVE LIFT IN INCHES. VELOCITY IN INCHES PER DIVISION. ACCELERATION IN INCHES PER DIVISION. Horizontal X-Axis: OPENING PERIOD = 30 DIVISIONS. CLOSING PERIOD = 31 DIVISIONS. DURATION OF LIFT WITH .013 CLEARANCE = 61 DIVISIONS. LEFT HAND TABLES: TABLE 1: REVERSED 1ST. HALF. | 2ND. HALF. INS. PER DIV. | INS PER DIV. PER DIV. | PER DIV. a₁: .0003 | .0003 a₂: 0 | 0 a₃: .00355795 | .00343593 a₄₀: -.00090202 | -.000241712 a₄₄: -.001362036 | -.001262562 TABLE 2: TOTAL NO OF DIV=43 | TOTAL NO OF DIV=44 t₁: 4 | 4 t₂: 9 | 9 t₃: 7 | 7 t₄: 23 | 24 TABLE 3: INS. PER DIV. | INS. PER DIV. V₁: .0012 | .0012 V₂: .0012 | .0012 V₃: .0261057 | .02525153 V₄: 0 | 0 TABLE 4: INCHES | INCHES S₁: .0024 | .0024 S₂: .0132 | .0132 S₃: .10276953 | .10573023 S₄: .429 | .429 RIGHT HAND TABLE: No.OF DIV. ON CHART | VALVE LIFT IN INCHES 1ST HALF | REVERSED 2ND HALF 0 | 0 | 0 1 | .00015 | .00015 2 | .0006 | .0006 3 | .00135 | .00135 4 | .0024 | .0024 5 | .0036 | .0036 6 | .0048 | .0048 7 | .006 | .006 8 | .0072 | .0072 9 | .0084 | .0084 10 | .0096 | .0096 11 | .0108 | .0108 12 | .012 | .012 13 | .0132 | .0132 14 | .016179 | .01618 15 | .022715 | .022471 16 | .032810 | .032261 17 | .046463 | .045487 18 | .063674 | .062149 19 | .084443 | .082246 20 | .108769 | .105780 21 | .134418 | .130608 22 | .159138 | .154576 23 | .182911 | .177668 24 | .205717 | .199865 25 | .227536 | .221151 26 | .248349 | .241507 27 | .268135 | .260917 28 | .286875 | .279362 29 | .304549 | .296825 30 | .321137 | .313289 31 | .336620 | .328735 32 | .350978 | .343147 33 | .364191 | .356508 34 | .376240 | .368795 35 | .387105 | .380002 36 | .396768 | .390101 37 | .405203 | .399078 38 | .412396 | .406915 39 | .418327 | .413595 40 | .422974 | .419100 41 | .426319 | .423413 42 | .428342 | .426516 43 | .429023 | .428392 44 | - | .429024 BOTTOM LEFT DIAGRAM: TIMING DIAGRAM WITH .020 TAPPET CLEARANCE CRANKSHAFT ANGLES. I.C. (Inlet Close), E.O. (Exhaust Open) 48°, E.C. (Exhaust Close) 12°, I.O. (Inlet Open) 9° EXHAUST VALVE LIFT CURVE AS PER THIS SCHEME & INLET AS SHOWN ON SCHEME 1053 31-10-22 E.D. BOTTOM RIGHT SECTION: ROLLS-ROYCE, LTD PRINT ROOM JUN 12 1934 DERBY. 1 DIVISION = 2° ON CAMSHAFT SCH.1089 E.D. | ||