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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).
Modifications and manufacturing instructions for the crankcase, camshaft, and tappets of the C.I. Conventional 6 engine.

Identifier  ExFiles\Box 123\5\  scan0306
Date  20th February 1939
  
1044

BR/HS.{Lord Ernest Hives - Chair}
c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}

DA.{Bernard Day - Chassis Design}3/G.20.2.39.

C.I. CONVENTIONAL 6 - CRANKCASE, CAMSHAFT & TAPPETS.

Please receive herewith :-

E.CD.1208 Top Half Crankcase, Camshaft and Tappets.
C.I. Conv. 6.

The modification to the crankcase, tappets and tappet covers are similar to those applied to C.I. Conv. 8 engine. The revised width of cams should be noted as compared with the cams on the B.60 engine, they are now .400" wide, and have a mean turning radius on the tappet base of .225".

Will you please follow this practice also for the C.I. Conventional 8 engine cams.

The position of the mechanical petrol pump and its eccentric on camshaft is the same as for the B.60.

The camshaft bearings are also the same as for the B.60.

Referring to the tappet to E.CD.821, we understand there is difficulty in drilling the small drain hole near the base owing to the local hardness of the material. Will you therefore leave out the drain hole altogether on these tappets when instructing them for both the C.I. Conv. 6 and 8.

The details for the C.I. Conventional 6 should be held in abeyance for the time being in accordance with Rm{William Robotham - Chief Engineer}'s request.

DA.{Bernard Day - Chassis Design}
  
  


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