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).
The suction pipe to the induction system, comparing Stewart and Autovac components.
| Identifier | ExFiles\Box 40\3\ Scan044 | |
| Date | 14th December 1925 | |
| R.R. 483A (50 M) (D.D. 91. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG14.12.25 suction pipe to the induction system. This together with the fact that the Stewart tank float has a longer stroke than the Autovac and thus admits more petrol per stroke, explains why the suction period is longer. The restriction to suction was removed and it was then found that the Stewart tank had exactly the same effect on the slow running as the Autovac. We have tried this method previously with the Autovac; the effect was beneficial, as with the Stewart, as far as interferences with slow running was concerned, but the effect of the greatly lengthened suction period was found to reduce the efficiency of the system too much. The new suction elbow supplied by the Autovac Co. achieves the same purpose without loss of efficiency, the restriction is introduced at low speeds where it is required, and is automatically removed at higher speeds, and full throttle. The Stewart people have apparently been faced with the same trouble, and have partly overcome it at the expense of efficiency. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||