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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
  
  


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