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).
Blueprint graph showing the results of 20/25 exhaust tests for a resonance silencer.
| Identifier | ExFiles\Box 104\2\ scan0044 | |
| Date | 17th July 1934 | |
| UNIT C.G. (CHINA) RESONANCE SILENCER 20/25 EXHAUST TESTS COMP RATIO 5.7:1 CAMSHAFT E.S. 7747 (H29) (CAM TIMING E.S. 7175) STANDARD IRON SYSTEM 2' MANIFOLDS. EXHAUST BOX (I.B.O.N.) WITH (1) COMPLETE SILENCER (FISHMAN NECK) (2) CUT-OUT OPEN. END PLATE REMOVED. BAFFLES (A) & (B) FITTED. (3) BAFFLE (B) REMOVED. (4) BAFFLES (A) & (B) REMOVED. THESE CURVES SHEW THAT A STRAIGHT THROUGH PIPE BETWEEN THE FRONT MANIFOLD AND THE REAR OF THE CAR HAS 2.5 "Hg BACK PRESS AT 3500 R.P.M. THE NEW SILENCER ONLY ADDS 2.7 "Hg TO THIS. Axis Labels: Left: EXHAUST BACK PRESS. "Hg. Bottom Left: B.H.P. Right: M.E.P. Bottom: R.P.M. | ||