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 note comparing the performance of different spark plug brands.

Identifier  ExFiles\Box 33\3\  Scan093
Date  3rd January 1921
  
ROLLS-ROYCE LIMITED.
INSTRUCTIONS.
To: Col Harker
Date: Jan 3rd 1921
re Plugs.
Cooke's plugs only run 1500 miles & then gave trouble with internal shorts.
Campion plugs run very well & give no trouble after 2000 miles test & still fitted in engine.
Lodge plugs do not suit our oily engine
Signed: H Clarke
RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880
This Sheet must be filed on completion of the work.
X.1812 C.
  
  


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