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).
Technical report discussing factors affecting fuel consumption and carburettor performance at low speeds.
| Identifier | ExFiles\Box 121\2\ scan0107 | |
| Date | 23th February 1929 | |
| Messrs. Rolls Royce Ltd. 23rd February 1929. -2- Secondly, the impression that some unobserved factor may have intruded is strengthened by noting that this difference occurs even at very low speeds where the auxiliary jet only is in action. During main jet operation where defective suspension, distribution etc. can considerably influence the fuel efficiency, such differences are sometimes possible, but during auxiliary operation, the factor of induction depression ensures both, regardless of mixture velocity and disintegration, and such a rate of consumption should only accompany an air/fuel ratio that would normally be over-rich up to and, indeed, well beyond the surging point. It is stated to be a recognized fact that for this reason, as suspension and disintegration do not enter into the question, the fuel consumption differences between all carburettors working under high depressions - as at low speeds in top gear - must of chemical necessity be very small indeed, and that the amazing discrepancy here is so completely without any chemical or physical precedent that they feel they can take the liberty of suggesting, in our mutual interests, that these readings are re-checked. It is of course agreed that such differences can easily be obtained by the influence of quite subtle secondary | ||