Rolls-Royce Archives
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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).
Comparison of valve port areas for various engines, including the Aspin valve and the B.60.

Identifier  ExFiles\Box 134\1\  scan0229
Date  10th June 1940
  
Jnr.{Charles L. Jenner} from Rm.{William Robotham - Chief Engineer}

1129.

Rm.{William Robotham - Chief Engineer}14/ML.10.6.40.

Here is DES.8874 showing the
valve port area of various engines.

We should like to get a direct comparison, with our timing, of the Aspin valve opening, against the valve opening of B.60. Fletcher has the Aspin valve for measurement.

We should like also to see what the valve would have to be like to get equal opening area to the best we can do with the single valve.

Rm.{William Robotham - Chief Engineer}
  
  


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