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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).
Change in material specification for inlet valve seats on B 60 and B. 80 units.

Identifier  ExFiles\Box 123\5\  scan0314
Date  22th February 1939
  
1044

To BY.{R.W. Bailey - Chief Engineer}
c. BY/CS.
c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner}
c. Da{Bernard Day - Chassis Design}/Mc's
c. HPS.{Horace Percy Smith - Experimental Factory Mgr}

Rm{William Robotham - Chief Engineer}/Swdl{Len H. Swindell} 9/ER 22.2.39.

B 60 and B. 80 Units.

Will you please alter the specification of the inlet valve seats from N/MC to S 65.

The former is an expensive material and is very difficult to machine and the latter is considerably cheaper, both as a material and a machineable job.

An appreciable amount of running has been carried out on S 65 as a valve insert, and has been found to be quite satisfactory.

All future units should be fitted with S 65 material seats unless otherwise stated.

Rm{William Robotham - Chief Engineer}/Swd.
  
  


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