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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).
Diesel engine performance, referencing Leyland engines' characteristics and concluding on the fuel economy of direct injection.

Identifier  ExFiles\Box 133\3\  scan0029
Date  22th February 1939
  
1128
Rm.{William Robotham - Chief Engineer}
C. BY.{R.W. Bailey - Chief Engineer}
DA.{Bernard Day - Chassis Design}1/G.22.2.39.

114's file

DIESEL ENGINES.

Re: Rm.{William Robotham - Chief Engineer}3/R.17.2.39. Leyland engines have a speed range given as 400 - 1900 r.p.m. Probably they do not run into the 6 to 1 period and get nowhere near the 3 to 1. It is true that the oscillation speed of the shaft is the same at all engine r.p.m., but the amplitude, and therefore the accelerating force, increases at the critical speeds and also with the torque increase. Absence of trouble from chains might therefore be due to low r.p.m. and low M.E.P.

Diesel engines, for ordinary transport purposes, have no advantage except fuel consumption, so the direct injection is sure to be the one to win.

DA.{Bernard Day - Chassis Design}
  
  


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