Blueprint graph comparing the B.M.E.P. and valve timing for Japan III and Japan I engine units.
| Identifier | ExFiles\Box 179\2\ img268 | |
| Date | 14th February 1931 | |
| JAPAN(Experimental Engine) 3 UNIT V1315 POWER CURVE (OPEN EXHAUST) COMPARISON OF B.M.E.P. BETWEEN JAPAN(Experimental Engine) III & JAPAN(Experimental Engine) I VALVE TIMING (.020 TAPPET CLEARANCE) JAPAN(Experimental Engine) III 10º EC 17º IC 54º 43º EO JAPAN(Experimental Engine) I 1º GC 3.5º IC 49º 43º EO JAPAN(Experimental Engine) I JAPAN(Experimental Engine) 3 B.M.E.P. R.R. TWIN CARBS. LeC 2924 JAPAN(Experimental Engine) 3 1.050 CHOKES JAPAN(Experimental Engine) I 1.000 CHOKES JAPAN(Experimental Engine) I CURVES CORRECTED TO 5.92 C.R. FROM 6.34. R.P.M. | ||
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).