Rolls-Royce Archives
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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).
Instruction sheet detailing ignition system adjustments and performance tests, noting issues with misfires during acceleration.

Identifier  ExFiles\Box 69\1\  scan0142
Date  1st December 1924
  
Order No. (2)

by any old std single type and the ignition again tried, when low speed running and pick up were found to be quite OK.
The double ballast was then put back and the contact breaker gap opened to .025", and the results were quite good, there being only one occasion when a misfire occurred on the pick up.
Readjusting the gap to .018" the performance was again tried and was very much the same as before with this combination, missing occurring upon accelerating with full throttle from 4mph on top gear.
Conclusion.
Our observations shew that there is

Signed (Contd)
  
  


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