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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 K.L.G. type FLB.30X sparking plugs removed from a Bentley chassis.

Identifier  ExFiles\Box 162\1\  img081
Date  2nd April 1937
  
To. [redacted]
c. to Em/GWH.{George W. Hancock - Head Chateauroux}
c. to Mr. [redacted]
c. to Wd.{Mr Wood/Mr Whitehead}
c. to E/R - Kc.

Rm{William Robotham - Chief Engineer}/Wst.1/JH.2.4.37.

Re K.L.G. type FLB.30X Sparking Plugs removed from your Bentley chassis.

These plugs when received were immediately put into an experimental Bentley, and were run for a considerable time at slow speeds and idling speeds with the engine both hot and cold with no misfiring at all.

There were then tried out for a run at high speed and after several tests at 90 m.p.h. there was no suspicion of misfiring when the car was slowed down and accelerated.

We therefore propose fitting these plugs back on your car for further test.

Rm{William Robotham - Chief Engineer}/Wst.
  
  


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