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).
Comparative tests of Peregrine and 20/25 battery ignition systems using various ballast resistances.
| Identifier | ExFiles\Box 168a\5\ img062 | |
| Date | 26th January 1933 | |
| XG145. COMPARATIVE TESTS WITH PEREGRINE AND 20/25 BATTERY IGNITION USING VARIOUS BALLAST RESISTANCES. PEREGRINE DISTRIBUTOR WITH .750 MAKE-RATIO. STANDARD COIL NOEX1 WITH 10 VOLTS ON PRIMARY. Ballast resistance 1.70 ohms, cold. (Std.) DISTRIBUTOR SPEED RPM. PRIMARY CURRENT. SECONDARY VOLTAGE. 400 1.365 9600 800 1.250 12000 1200 1.115 14400 1600 .909 15200 2000 .840 15200 2500 .700 15200 Ballast resistance 2.45 ohms, cold. DISTRIBUTOR SPEED RPM. PRIMARY CURRENT SECONDARY VOLTAGE. 400 1.070 9600 800 .970 9400 1200 .915 9400 1600 10000 2000 .700 11200 2500 .565 11200 Ballast resistance 2.02 ohms, cold. DISTRIBUTOR SPEED RPM. PRIMARY CURRENT. SECONDARY VOLTAGE. 400 1.200 10400 800 1.060 12000 1200 .984 12800 1600 .830 13200 2000 .705 13000 2500 .670 12800 | ||