Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Requirements for a Bosch magneto for a 20 HP engine.

Identifier  ExFiles\Box 57\2\  Scan240
Date  13th December 1927
  
X5791
EFC2/T13.12.27.

To Roy.{Sir Henry Royce} from EFC.
c. By.{R.W. Bailey - Chief Engineer}

BOSCH MAGNETO FOR 20 HP. X5790

We are anxious to know if the Bosch people make a magneto suitable for the 20 HP. - one to be of the sleeveless type, without a distributor, and to have a particularly good low speed performance. As regards the range, we would like to see, if they have such a machine to offer, what range they have provided.

At present we have a range of 58° on the sleeve machine for the 20 HP., but we do not think such a magneto can be obtained with short cobalt steel magnets, and an equally good or better low speed performance as the present sleeve type.

We want -
(1) A sleeveless magneto.
(2) Considerably reduced cost.
(3) Preferably short cobalt steel magnet type, like our present 20 HP. type, as this gives a greater degree of accessibility to other parts of the engine.
(4) Particularly good low speed performance.
(5) As large a range as possible up to 58°.

But, as stated, if we fix the range at 58° our impression is that all of these at the same time are not possible.

EFC.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙