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).
Test report on three different AC short reach spark plugs, detailing their performance and suitability.

Identifier  ExFiles\Box 162\2\  img012
Date  4th August 1950
  
AC.

AC-K11. Short reach plug as used on Vauxhall "25"
Set on 4-8-50
30-G-VII Not sufficient running for report.

AC-K9V. Short reach plug as used on Vauxhall "10"
Set on 4-8-50 - Removed after 692 miles.
Unsuitable for B80 - running too hot.

AC-46. Short reach plug obtained for trial on B80.
These appear to be running too cool in B80.
Slight misfiring on pick up noticed on 33-G-VII after 3,158 miles.
  
  


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