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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 results and comparisons of different K.L.G. spark plug models.

Identifier  ExFiles\Box 162\2\  img005
Date  23th February 1940
  
K.L.G.

FLB-30X. Standard 25/30 & Bentley plug.
Set on S-6-IV, 6-B-IV, 7-B-V
The Corundite insulator on the K.L.G. plug is superior to the Champion Sillimanite.
1 case of misfiring on the Ripple. (1586 miles)
9000 miles on 7-B-V before misfiring. (BV)
5452 .. .. 27-G-VI .. .. .. (Wraith)

FLB-30XP. Same dimensions as FLB-30X but Platinum point on earth electrode.
1 set running in transport car, to report Rm{William Robotham - Chief Engineer}/VM. 4/DT. 23-2-40
(Determining cause of misfire; oxidation of points or insulator leakage)

FLB-50X. Used for PIII
12,579 miles on 35-EX; satisfactory.
  
  


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