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 data on heat flow vs. mixture strength and ignition effect for a low compression engine.
| Identifier | ExFiles\Box 24\4\ Scan096 | |
| Date | 6th September 1923 guessed | |
| SHEET 4. MIXTURE AND IGNITION - LOW COMPRESSION. HEAT FLOW WITH VARYING MIXTURE STRENGTH LOW COMPRESSION ENGINE - RATIO 3.9. All readings at 500 r.p.m. Dyn. lbs. Pts. hr. To water B. Th. U's. min. HP. 101 25.9 1328.4 21.28 103 24.16 1402.2 21.46 106 21.2 1512.9 22.09 107.5 19.12 1697.4 22.41 108 17.7 1808.1 22.5 107.5 17.14 1845.0 22.41 107.5 17.8 1734.3 22.41 104.5 18.36 1734.3 21.77 97 25.7 1402.0 20.21 -- 23.1 1475.0 ----- 98 22.0 1476.0 20.42 -- 27.0 1328.4 ----- -- 27.7 1254.6 ----- IGNITION EFFECT ON HEAT FLOW - ENGINE SPEED 1000 R.P.M. Dyno. lbs. ºF temp. diffce. B.Th.U's. min. Position of Ignition lever. 114 39.6 3270 Full advance. 117 35.1 2900 Normal position. 110 36.9 3042 Full retard. | ||