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).
Power output graph for an X5BC engine unit, showing performance under various test conditions.
| Identifier | ExFiles\Box 90a\2\ Scan139 | |
| Date | 1st January 1934 | |
| POWER OUTPUT X5BC UNIT [REMOVED FROM 35.A.E. (HALL'S) CHASSIS] STANDARD PRODUCTION ENGINE ALL CURVES TAKEN WITH OPEN EXHAUST ① COMPLETE AIR SILENCER FITTED. R.R.X NEEDLES. MIXTURE NORMAL & IGNITION SET 20° B.T.D.C THROUGHOUT TEST. ② AS ① BUT WITH MIXTURE ADJUSTED AT EACH SPEED. ③ AS ② BUT WITH IGNITION ADJUSTED AT EACH SPEED. ④ NO AIR INTAKE, MIXTURE & IGNITION ADJUSTED AT EACH SPEED. B.H.P. B.M.E.P. (LB/SQ") R.P.M. VALVE TIMING (.020 CLEARANCE) T.D.C. 11.5° 45.0° EXH. INL. 35.5° R P / 1-1-34 | ||