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 carburetter for the EAC engine.
| Identifier | WestWitteringFiles\M\2Jan1925-March1925\ Scan22 | |
| Date | 1st January 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/ACL/LMB.1.25. REPORT ON CARBURETTER FOR EAC. ENGINE. First we will deal with the results of the tests we have carried out on the EAC. Carburetter, the object of which has been to determine its chief characteristics and explore its metering capacity at various speeds and loads. The tests were conducted on the standard EAC. engine with a 4.12 to 1 compression ratio. All tests were done with cutout open. The carburetter was according to drawing E.72226. It has a .600 diameter low speed throat, 1.250 high speed throat and air valve spring E.71540 which actually has a rating of 38 ozs/inch deflection. Metering under throttled conditions and light loads :- The setting was as follows :- The low speed jet was adjusted to supply a correct mixture with the engine running light at the speed at which the air valve just commenced to lift. This speed was 250 r.p.m. The high speed jet was set at 2000 r.p.m. full load to give the minimum supply of fuel which would just maintain maximum torque. The Froude Dynamometer was left on this setting and the engine throttled down to a low speed. At each throttle setting the mixture control was adjusted to give the maximum number of r.p.m. and the speed of the engine and position of the mixture control was noted. contd :- | ||