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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).
Inquiry to the AC-Sphinx Sparking Plug company regarding engine misfiring on a Bentley using leaded fuel, asking if ceramic plugs are better than mica plugs.

Identifier  ExFiles\Box 163\5\  img045
Date  9th July 1936
  
86011

Hs{Lord Ernest Hives - Chair}/Wst.12/JH.

9th July, 1936.

N.F. Stockbridge Esq.,
The AC-Sphinx Sparking Plug Co.Ltd.,
Dunstable,
Bedfordshire.

Dear Mr. Stockbridge,

In there a condition with the use of leaded fuels where misfiring occurs on motor car plugs?

We had a case recently where a Bentley customer "pottering" about London, without doing any high speed "stuff", had bad misfiring after about 400 miles, after using leaded fuel. The plug in question was a mica plug and we wonder if you have any genuine evidence that a aramic plug would be better in this respect?

Yours sincerely,
  
  


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