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 bed performance comparison between standard manifolds and manifolds to Lec.2216 on an Engine 11-G-111.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 121 | |
| Date | 28th January 1927 guessed | |
| contd :- -2- Engine 11-G-111. Standard carburetter. Test bed exhaust system with bomb silencer. Power curve - corrected to N.T.P. | R.P.M. | Manifolds to Lec.2216 | | Std. manifolds. | | Loss or gain in B.HP. to pipe to Lec.2216 | | --- | B.M.E.P. | B.HP. | B.M.E.P. | B.HP. | --- | | 500 | 85.7 | 10.3 | 87.8 | 10.5 | - 0.2 | | 750 | 86.8 | 15.6 | 88.8 | 16.0 | + 0.4 | | 1000 | 91.3 | 21.9 | 90.5 | 21.8 | + 0.1 | | 1250 | 92.3 | 27.8 | 89.4 | 26.9 | + 0.9 | | 1500 | 90.0 | 32.5 | 87.2 | 31.5 | + 1.0 | | 1750 | 88.0 | 37.0 | 86.9 | 36.5 | + 0.4 | | 2000 | 88.7 | 42.7 | 85.4 | 41.3 | + 1.4 | | 2250 | 87.1 | 47.2 | 84.7 | 45.9 | + 1.3 | | 2500 | 82.8 | 49.8 | 82.1 | 49.3 | + 0.5 | | 2750 | 77.6 | 51.3 | 75.5 | 50.0 | + 1.3 | | 3000 | 67.2 | 48.5 | 69.4 | 50.1 | - 1.6 | These results indicate that there is no appreciable difference in performance between the two pipes. Distribution. No difference can be detected between the two systems. This system should be fitted on the next 10,000 miles test car with a view to standardisation. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||