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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 analysis of engine valves and ferrous forgings for various chassis models.

Identifier  ExFiles\Box 148\5\  scan0381
Date  20th July 1938
  
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ROY{Sir Henry Royce}/Les.1/S.20.7.38.

The saving in using Motor Component Valves against the present factory cost of our Valves, is £2. 0s. 3d per chassis. Motor Components' original figure for machining and stelliting our forgings was based on our aero practice. For their latest quotation, an electrically up-set silichrome valve has been considered, which in the case of the Inlet Valve, will not be machined at the back of the Head. 25 hours satisfactory full throttle running have been done with similar machined valves but produced by the Belgrave Co. We are now procuring 36 samples of each of the new small valves and it is intended that these shall be fitted on the first Bentley III going to France.

FORGINGS.

The money spent on our present chassis for bought out Ferrous stampings is as follows:-

£ s. d.{John DeLooze - Company Secretary}
Phantom III 63 . 3
25/30-HP 26 10 10
Bentley II 25 3 4

Although we are in a position finally to pay more for our forgings compared to other manufacturers, we need experience with out parts when bought at a competitive price. It is very difficulty to get a fair price unless we make the specification practically identical to other manufacturers. This will enable the extra money to be spent where an advantage is gained by the customer. If we only make slight economies which are quite satisfactory and which still leave our forging costs high compared to other manufacturers, we shall in the future need to go over all the work again by which time the design will be in a state where it cannot be modified except at large expense.

Although the saving in cost from forgings may not be large, it is necessary to study the cost of all forgings and pressings at an early stage in order to estimate more accurately the correct price of our bought out components.

The following features control the cost of our forgings:-

1. Suitability of equipment and experience of producing each particular type of forging.
2. Cost of material
3. Design of forging
4. Percentage of firm's profit (governed by goodwill with ourselves).

(Contd:-
  
  


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