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).
Page discussing exhaust system losses, an experimental overhead camshaft Bentley engine, and methods for investigating engine smoothness.
| Identifier | ExFiles\Box 161a\4\ scan0046 | |
| Date | 31th March 1936 guessed | |
| (sheet 3) the exhaust system can be examined with a view to further reducing losses. A development is in hand to obtain an ignition governor characteristic suitable for the high compression ratio of 7 to 1. Future Bentley. A scheme for an experimental conversion of a Bentley engine to an overhead camshaft type of cylinder head has been designed and instructed. As the primary object is to test whether such a scheme can reach the required standard of silence, it is agreed that the instruction of the single cylinder replica of the 3 valve ramp head, which is part of the design, should await the results of testing the main engine. Engine Smoothness. The desirability is emphasised of obtaining a suitable indicator for single cylinder work for investigating rate of pressure rise in the cylinder. The difficulties are well known and Wd{Mr Wood/Mr Whitehead} is dealing with the matter of testing out recently developed instruments. Experimental at the present time use the ignition advance as an indication of the rate of burning of the charge. As a means of investigating the smoothness value for cylinder heads before test, it is proposed to develop the system of sectioning plaster casts to integrate the rate of change of flame front area. with flame travel. E.{Mr Elliott - Chief Engineer} | ||