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).
Issues with the exhaust cutout on a 3½ Litre Bentley, specifically rattling, wear, and exhaust gas impingement.
| Identifier | ExFiles\Box 86\3\ scan0024 | |
| Date | 2nd August 1933 | |
| LID{A. J. Lidsey} X223. c Hs.{Lord Ernest Hives - Chair} ✓ c By.{R.W. Bailey - Chief Engineer} c Of. from Mx.{John H Maddocks - Chief Proving Officer} Mx{John H Maddocks - Chief Proving Officer}15/T2.8.33. 3½ LITRE BENTLEY - EXHAUST CUT OUT "The Silver Ghost Cutout which is now being fitted on Production Chassis on test is very unsatisfactory." "The elongation of the exhaust pipe due to the heat effects causes the operating mechanism to foul the hand brake differential shaft, and thus prevents the valve from seating properly. This of course causes a very objectionable rattling noise." "Another feature which we feel may cause trouble is that when the cutout is used the exhaust gases impinge on one of the bearings of the foot brake differential shaft." "Another point is that the split pin in the joint pin securing the cutout valve is showing considerable wear and does not appear as though it will have a very long life." "We are sending you a complete cutout for your examination which illustrates this latter point." [Signature] | ||