Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Technical analysis of ignition system performance, considering current, condenser capacity, and platinum point life.

Identifier  ExFiles\Box 163\7\  img101
Date  4th March 1927
  
Contd. -2-

loss, and we should imagine this would be very good for platinum point life.

To obtain a reduced value of

current at break / condenser capacity

with a longer period of make, would necessitate as a result of the increased primary inductance, an increase in the number of secondary turns for the same secondary voltage and energy.

We do consider that it is an advantage to reduce the absolute value of

current at break / condenser capacity

as much as possible, but are of the opinion that the speed of break in relation to the value of this quantity is not of much consequence. In our own case where the current at break is maintained approximately the same for varying speeds, there is little improvement with the quicker break.

Further, any advantage that could be obtained by lowering this ratio by altering the duration of the make without altering coil and condenser to suit, would result in a reduction of energy and therefore of sparking capabilities at the higher speeds.

We have no information yet as to whether Delco or American Bosch are any different as regards the life of the points, but should imagine they would have similar life.

EFC.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙