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).
Ideal spark plug insulator materials and designs to resist carbon build-up.

Identifier  ExFiles\Box 34\2\  Scan098
Date  8th May 1918
  
Contd. -4- EH3/LG8.5.18.

The ideal plug would be one which the insulator kept so hot that no carbon would stay on it, this suggests a pot insulation but no material we have tried will stand up. The Bosch material is no use on Aero engines it forms "barnacles"
The success of the "Pognon" plug to resist soot is because the insulator keeps very hot.

E H.{Arthur M. Hanbury - Head Complaints}
  
  


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