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).
Test results comparing an induction system with and without a redistributor, and comparisons between Kestrel and Goshawk engines.
| Identifier | ExFiles\Box 179b\3\ img299 | |
| Date | 3rd March 1933 | |
| -2- Ha/Tmr.5/WJ.6.3.33. Cont'd.{John DeLooze - Company Secretary} The appended results shew the value of the induction system with and without the redistributor for each throttle position, and the final curve indicates the weakest maintained consumptions throughout the power range, at the constant normal speed. The results shew the system without the redistributor to be superior, by virtue of maintaining the power at the weakest mixture with an increase in economy varying from 1% to 4%. This is also confirmed by observation of the distribution, the general tendencies for the three front cylinders on B.side and three rear A.side to be richest, when the redistributor is fitted. Without the scheme the cylinders shew practically equal distribution, the rear block on A.side shewing very slightly richer than the rest. These observations were carried out at all throttle openings and with mixtures varying from weak to excessively rich, with both hot and cold engine. Under all conditions the system without redistributor shew better results. The induction system, whether fitted with redistributor or not, always has a tendency to be richer on A.side when first started up from cold. The results, when plotted with similar specific consumptions obtained on the Kestrel S. engine, shew the economy of the Goshawk engine to be superior to the Kestrel but we should point out that both engines do not run under the same conditions as regards throttle positions, engine R.P.M., but the results are at varying powers for constant speed in each case. To complete the induction pipe comparisons, we intend to repeat the specific consumption loop on an engine fitted with a Kestrel induction pipe and Goshawk supercharger; this will shew the definite values of the induction pipes. Hw/G.H.Farmer. 3.3.33. Attached:Three prints. | ||