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).
Power tests for the Eagle engine, comparing different configurations to increase power.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan154 | |
| Date | 26th August 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/TAG/LG26.8.25. EAGLE POWER TESTS. The object of the following tests was to obtain more power from an Eagle engine with the view to the production of a more powerful engine in the future. For the above, tests were carried out with :- (1) Various compressions ratios. 5.27 to 1 (standard) 6.09 to 1 6.28 to 1 (2) Carburation and induction systems. Eagle Vlll. and lX types compared. (3) Camshafts. Eagle Vlll (no overlap) Eagle lX. (24° ") (4) Range of speed increased. -------------------- A series of power curves were taken, the results of which are plotted and attached to this report. The range of speed was from 1700 to 2300 r.p.m. and in two cases 1700 to 2400 r.p.m. CURVE 1. CAMSHAFT COMPARISON. Shows a comparison in the performance of an Eagle engine when fitted viz :- (1) Eagle Vlll. camshafts (no overlap). (2) " lX. " (24° " ) (3) " Vlll carburetters and induction pipes (for each case 1 and 2.) (4) Standard pistons 5.27 to 1. It will be seen from this curve that when the engine contd :- | ||