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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 notes on Lodge spark plugs concerning voltage measurements, wear, and misfiring causes.

Identifier  ExFiles\Box 162\2\  img008
Date  23th February 1940 guessed
  
LODGE.

741.
1 set on 1-R-1. Voltages measured every 1000 miles.
Tests to determine whether oxidation of points, or insulator leakage causes misfiring after a fair mileage.

B14
Wear .003 after 1000 miles in 2-B-50.
Firing voltages under pressure in Lab. rig, shows a decrease of approx 2 K.V. after 110 miles on 1-R-1.
Not sufficient running for a definite verdict on these plugs.

640+641
Not tried on B60 or B80 or Ripple
  
  


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