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 automatic advance of cam with speed for Scintilla Magnetos types AG6A and AM6A.
| Identifier | ExFiles\Box 37\1\ scan 282 | |
| Date | 28th August 1934 | |
| TITLE: AUTOMATIC ADVANCE OF CAM WITH SPEED ON SCINTILLA MAGNETOS TYPE'S AG6A AND AM6A. REFERENCE (TOP RIGHT): B.I. GRAPH LABELS: R.R. GOSHAWK. DISTRIBUTOR AM6A NO 26485. AM 6A No 34397. AG6A. No 21523. Y-AXIS: CAM ADVANCE (DEGREES) - Distributor: 0, 2, 4, 6, 8, 10, 12, 14 - Engine: 0, 4, 8, 12, 16, 20, 24, 28 - Magneto Armature: 0, 6, 12, 18, 24, 30, 36, 42 X-AXIS: DISTRIBUTOR SPEED (RPM) - Axis Scale: 0, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 - Speed Conversion Table: - MAGNETO ARMATURE SPEED: 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000, 3300, 3600, 3900, 4200, 4500 - ENGINE SPEED: 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000 - DISTRIBUTOR SPEED: 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500 DATA TABLES: For AG6-A No 21523: - AUTOMATIC RANGE = 32.5°, 22° ON ENGINE - HAND RANGE = 17.5°, 11.5° - TOTAL = 50°, 33.5° For AM6-A No 26485: - AUTOMATIC RANGE = 33°, 22° ON ENGINE - HAND RANGE = 20°, 13.5° - TOTAL = 53°, 35.5° For AM6A No 34397: - AUTOMATIC RANGE = 32.5°, 21.5° ON ENGINE - HAND RANGE = 20.5°, 14° - TOTAL = 53°, 35.5° BOTTOM RIGHT CORNER: MAG. M/C'S ETC 28/8/34 J.L. | ||