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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).
Weak fuel mixture issue in cold conditions and proposing solutions for air temperature control.

Identifier  ExFiles\Box 83\2\  scan0246
Date  21th February 1938
  
Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} from Rm.{William Robotham - Chief Engineer}
Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}
c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}

200a

6.B.IV.

Rm{William Robotham - Chief Engineer}7/R.21.2.38.

With reference to Daily Report dated 15/17.2.38., you will notice that using a thermostatic control on the engine instead of thermostatic control radiator shutters has brought up a complaint that the mixture goes weak under cold atmospheric conditions. We should like you to consider some means of ensuring that the air temperature does not fall below a figure sufficient to give reasonable carburation whatever the outside temperature may be. We suggest that an air intake through the rocker cover might have the desired effect, alternative-ly some sort of exhaust scoop.

Rm.{William Robotham - Chief Engineer}
  
  


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