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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).
Laboratory report on the advantages of casting Bentley iron cylinders without chills.

Identifier  ExFiles\Box 132\4\  scan0062
Date  22th May 1937
  
To EY.
c. to RHC.{R. H. Coverley - Production Engineer}
c. to E.{Mr Elliott - Chief Engineer}
c. to Hs.{Lord Ernest Hives - Chair}

Rm{William Robotham - Chief Engineer}

1124.

HL.2/AG.22.5.37.

Laboratory.

Re: Cast Iron Cylinders without Chills.

We have had five Bentley cylinders cast without chills in the bores. These have been machined and the Inspection report is very satisfactory. The advantages of the unchilled bore are :-

(1) There is less liability to blowholes due to the metal "kicking" off the chills, thus reducing scrap.

(2) The bores are easier to machine.

(3) Iron is easier to control in Cupula.

The Brinell hardness of the bore is 238 compared with 270 for our chilled cylinders. The lower figure is much higher than the cylinders supplied by the Midland Cylinder Company and the Buick cylinder sent from America. These latter are about 200 Brinell.

Our experience is that the harder the bore the better the wearing qualities.

However, you may consider that these cylinders are sufficiently hard to give good wearing qualities.

We are not casting any more until you agree, and these five castings are held up by Mr. Clark for your inspection and decision.

-Please note

Hl. HC.
  
  


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