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).
Comparing the thermal efficiencies and heat distribution of an EAC.1 engine and a standard 40/50 engine.
| Identifier | ExFiles\Box 72\4\ scan0060 | |
| Date | 14th November 1923 | |
| R.R. 498A (20H) (D.A. 652 20-3-24) J.H.D. -1- Expl. No. 9771 9770 REF: Hs{Lord Ernest Hives - Chair}1/LG14.11.23. EXPERIMENTAL REPORT. THERMAL EFFICIENCIES AND HEAT DISTRIBUTION OF EAC.1. ENGINE & STD. 40/50 RR. COMPARED. The EAC. engine was fitted with the Knave carburetter. This carburetter had the air valve spring removed and extra air was admitted through a part cut in the side. Adjustment was made to both fuel and air supply for each speed in order to obtain the maximum power and economy of fuel. For the test on the 40/50 RR. a standard carburetter was used. The mixture control was adjusted for each speed. The comparison of the thermal efficiencies, of these two engines, is based upon the air standard efficiency, owing to the difference of compression ratio. Figures are given on page 5. The tests on the EAC. and 40/50 RR. were conducted with the 'cut-out' on silencer open except in the case of the EAC. at speeds of 600 - 750 r.p.m. where it was closed in order to get sufficient heat to the standard 'hot-spot'. With the cut-out closed, the EAC. hot-spot reaches a temperature of 350°C at 2000 r.p.m. at the particular spot where the thermometer was inserted. Hs{Lord Ernest Hives - Chair}/ACL. | ||