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 tables for heat flow with varying mixture strength and ignition timing on a low compression engine.
| Identifier | WestWitteringFiles\K\September1923\ Scan29 | |
| Date | 1st 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 | 16.36 | 1734.3 | 21.77 | | 97 | 25.7 | 1402.0 | 20.21 | | -- | 23.1 | 1476.0 | ---- | | 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. | | ||