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).
'Engine Boom' or 'Induction roar' issue and potential solutions for the 20 H.P car.
| Identifier | ExFiles\Box 53\1\ Scan101 | |
| Date | 3rd February 1923 | |
| - 2 - EP {G. Eric Platford - Chief Quality Engineer} 4/H3.2.23. ENGINE BOOM. In this case I take it you refer to the "Induction roar", which, as explained to you at our last meeting, we were afraid would exist on an engine which gave good power at low speeds, full throttle, owing to the rather early valve timing. This matter I was able to bring before R. {Sir Henry Royce} at our last meeting, and he has arranged for some experiments to be carried out by Hs. {Lord Ernest Hives - Chair} on camshafts, whereby it is hoped to obtain maximum power, and yet be free from this boom. We feel, however, in the meantime, that one will have to make the best of this, and if the boom is so seriously objectionable, we may have to compromise by sacrificing the present power at low speeds. It must be realised that there are a considerable number of faults which may be criticised on the present 20 H.P car, and these features have received attention, but one must carry on with production until such time as these improvements are able to be embodied. It must also be realised that the instructions from CJ. were that deliveries must be obtained, and the models given as samples, i.e. 4-G-2 and 7-G-2 also had these faults to which you refer to a greater or less extent, besides numbers of others which we have from that time eliminated. We feel therefore, under the circumstances, it is advisable for these cars to come to the Works occasionally to be modernised with new features which we are, as time goes on, in a position to embody. EP. {G. Eric Platford - Chief Quality Engineer} MADE AT CROXLEY | ||