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).
Report page detailing engine test results, including valve timings, cylinder head comparisons, and detonation curves.
| Identifier | ExFiles\Box 133\1\ scan0107 | |
| Date | 17th September 1936 | |
| -3- Hs{Lord Ernest Hives - Chair}/Ed.{J. L. Edwards}1/KW.17.9.36. Section II. The results of this, and the next two sections, are incorporated in the report Hs{Lord Ernest Hives - Chair}/Wd.{Mr Wood/Mr Whitehead}2/WJ.12.3.36. The valve timing used for these tests was, with the usual .020" tappet clearance - I.O. 19°L. E.O. 42°E.{Mr Elliott - Chief Engineer} } I.C. 48°L. E.C. 8°L. } The semi-hemispherical head was fitted as standard with a C.R. of 7.3 : 1, and exhaust and induction pipe tests were run as per Figs. II & III. A detonation curve on Shell No.1 was run from 2,000 R.P.M. to 6,000 R.P.M., but no signs of knocking were observed. Section III. The valve timing used for these tests was, with .020" tappet clearance - I.E. 4°E.{Mr Elliott - Chief Engineer} E.O. 51°E.{Mr Elliott - Chief Engineer} } I.C. 51°L. E.C. 7°L. } and comparative valve lift diagrams are given in Fig. IV. Power curves were run on penthouse, hemispherical and semi-hemispherical heads (Fig.V), and air consumption and detonation curves on the penthouse and hemispherical heads (Fig.VI). Volumetric efficiency peaks at about 88% and there is no detonation. A curve was run with only one exhaust valve in operation, and the results are shown in Fig.VII. | ||