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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).
Cost and weight comparison between an all-aluminium monoblock (J.III type) unit and an existing cast iron 20/25 unit.

Identifier  ExFiles\Box 10\5\  05-page017
Date  14th May 1938 guessed
  
658 Hives 10LL

COMPARISON ALL ALUM. MONOBLOCK (J.III TYPE) UNIT WITH EXISTING 20/25 UNIT.

Sp.{Mr Spinney} Gr.{George Ratcliffe} Cast Iron 2.81 times that of Al.

Cast Iron.
Wt. of cylinder block. 62.5
Wt. of cylinder head. 73
Total weight C.I. @ 1d/lb. 135.5
Total cost of cast iron 11/3.

Aluminium.
Wt. of cylinder block. 22.2
Wt. of cylinder head. 26
Total wt. of aluminium @ 1/4 per/lb. 48
Total cost of Al. 64/-.

Liners basically cannot be much more expensive than the cylinder bores they replace, otherwise how could the Wolsey Hornet fit them

Rm.{William Robotham - Chief Engineer}
  
  


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