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).
Developing a satisfactory automatic ignition advance, with comparisons to the Bosch ignition system.
| Identifier | ExFiles\Box 51\5\ Scan223 | |
| Date | 27th March 1922 | |
| Contd. -7- to obtain the variation of the curve B shown from 0 to 250 R.P.M., as at these comparatively slow speeds the power available is comparatively slight. It is not necessary that any part of the curve B should be reproduced except in an approximate manner. This particularly applies to the first portion of which we have just spoken. We shall be interested to hear at your convenience as to what you think can be done. If we do succeed in producing a satisfactory automatic advance, this apparently would be something which no other ignition maker can claim to have done up to the present. The Bosch ignition, for instance, works on an exactly similar principle and suffers from exactly the same defects, except that the governor weight range of motion may be selected nearer to the 90° position. It does not produce a curve of the type B, or even A, except with a very rough degree of approximation. We are, however, now making experiments on the Bosch ignition governor to see practically what can be done with a single moving system (or a twin moving system in which the weights are allowed to overlap) by selecting the range suitably near to the 90° position. We will send another later report containing any idea which may occur to us in this connection. EFC. {E. Fowler Clarke - Electrical Engineer} | ||