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).
Ignition and detonation test results for a modified cylinder head on Engine No. B-9.
| Identifier | ExFiles\Box 86\1\ scan0188 | |
| Date | 20th March 1936 guessed | |
| CYLINDER HEAD E.60660. Bar 757 m/m.{Mr Moon / Mr Moore} TURBULENT LIP REMOVED (Loc.5002) WITHOUT TOUCHING PISTONS. TEST BED EXHAUST SYSTEM. ENGINE No. B-9. Ignition & Detonation Test. | R.P.M. | Load | C.Load | B.M.E.P. | Pts/Hr. | Pts/ BH./ Hr. | Ign.Adv. Max. Power | Ign.Adv. 2% drop Advance | Ign.Adv. 2% drop Retard | Ign.Adv. to just avoid deton. | Load drop to avoid deton. | BMEP to avoid deton. | |---|---|---|---|---|---|---|---|---|---|---|---| | 3500 | 71.5 | 72.2 | 91.7 | 68.0 | | 34 | 40 | 28 | | | | | 3250 | 76.2 | 76.9 | 97.7 | 66.0 | | 34 | 40 | 28 | | | | | 3000 | 81.5 | 83.3 | 105.8 | 62.0 | | 34 | 40 | 28 | | | | | 2500 | 88.0 | 88.8 | 112.8 | 54.0 | | 34 | 40 | 28 | | | | | 2000 | 92.0 | 92.8 | 118.0 | 45.0 | | 34 | 40 | 28 | | | | | 1500 | 91.8 | 92.6 | 117.6 | 34.0 | | 34 | 39 | 26 | | | | | 1250 | 94.0 | 94.8 | 120.4 | 31.0 | | 29 | 35 | 24 | 22 | 3.5 | 115.9 | | 1000 | 87.0 | 87.8 | 111.5 | 25.0 | | 27 | 30 | 23 | 20 | 2.5 | 108.2 | | 750 | 84.5 | 85.0 | 108.0 | 20.0 | | 23 | 28 | 17 | 14 | 2.0 | 105.3 | | 500 | 82.5 | 83.3 | 105.9 | 15.0 | | 14 | 20 | 11 | 7 | 1.0 | 104.6 | | ||