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 data for Engine No. B-9 using Cylinder Head E.60660 and Shell No. 1 test bed exhaust system.
| Identifier | ExFiles\Box 86\1\ scan0189 | |
| Date | 20th March 1936 guessed | |
| CYLINDER HEAD E.60660. C/R.{Sir Henry Royce} 6 : 1. TEST BED EXHAUST SYSTEM. SHELL No. 1. ENGINE No. B-9. IGNITION & DETONATION TEST. | R.P.M. | Load | C.Load | B.H.P. | Pts/Hr. | Pts/BHP/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 | C BMEP | |--------|-------|--------|--------|---------|-------------|----------------------|---------------------------|--------------------------|--------------------------------|-----------------------------|-------|---------| | 3500 | 73.0 | 73.7 | 107.4 | 68.0 | .637 | 27° | 32 | 23 | | | 93.7 | | | 3250 | 77.5 | 78.3 | 106.1 | 66.0 | .622 | 26° | 32 | 23 | | | 99.5 | | | 3000 | 81.5 | 82.2 | 102.8 | 62.0 | .603 | 26° | 31 | 21 | | | 104.3 | | | 2500 | 87.0 | 87.8 | 91.5 | 54.0 | .590 | 26° | 31 | 21 | | | 111.6 | | | 2000 | 90.8 | 91.7 | 76.4 | 45.0 | .588 | 26° | 31 | 21 | | | 116.4 | | | 1500 | 90.3 | 91.2 | 57.0 | 35.0 | .614 | 26° | 30 | 21 | | | 116.0 | | | 1250 | 92.0 | 92.9 | 48.4 | 31.0 | .640 | 26° | 30 | 20 | | | 118.0 | | | 1000 | 88.8 | 89.7 | 37.4 | 24.0 | .642 | 24° | 27 | 18 | 15 | 4.0 | 109.0 | 114.0 | | 750 | 84.0 | 84.8 | 26.5 | 20.0 | .755 | 17° | 23 | 14 | 10 | 3.0 | 104.0 | 107.8 | | 500 | 82.0 | 82.8 | 17.2 | 13.0 | .757 | 11 | 14 | 8 | 5 | 2.5 | 101.8 | 105.2 | | ||