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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).
Recommending experimental tests for an aluminium tin bearing alloy with a soft crankshaft on a Bentley chassis.

Identifier  ExFiles\Box 115\1\  scan0025
Date  9th April 1936
  
Roles
10 ZwoR
o.Sg.{Arthur F. Sidgreaves - MD}
c.Hs.{Lord Ernest Hives - Chair}
o.Wn.
Rm{William Robotham - Chief Engineer}
Sewell We ought to allot an old engine for this job. Have we anything available? Rm{William Robotham - Chief Engineer}
BY.2/J.9.4.36

HL'S ALUMINIUM TIN BEARING ALLOY.
--------------------------------
As a result of our meeting with Mr.Devereux of Messrs. High Duty Alloys Limited on Friday last the 3rd inst., it is apparent that if the Company is to derive any financial benefit from the sale of the above alloy, it will be absolutely necessary for it to be demonstrated that the alloy will function equally satisfactorily when run in conjunction with a soft crankshaft.

So far the alloy has only been proved satisfactory when run with a nitrogen hardened crank, but of course this class of crankshaft is not used to any extent by other motor car manufacturers etc. who generally speaking fit crankshafts in Nickel Chrome Steel or other similar comparatively soft material which has not been surface hardened in any way.

We have been in touch with the English Steel Corporation Limited, who supply our crankshafts and they advise us that the V.C.M. Steel which we use will function perfectly satisfactorily in the soft state and that in this condition it will be strictly comparable with the crankshafts which they supply generally for motor car use.

I therefore, recommend that experimental tests are put in hand on the Bentley Chassis using a V.C.M. Crankshaft heat treated, but not nitrogen hardened in order to demonstrate that HL's bearing alloy will function satisfactorily under these conditions.

BY.{R.W. Bailey - Chief Engineer} Ry
  
  


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