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).
Air flow tests examining the effects of masking and fairing on valve seats.
| Identifier | ExFiles\Box 134\1\ scan0010 | |
| Date | 1st July 1937 | |
| -5- Air flow tests have been carried out, however, and they show a considerable advantage for this type of valve and seat over any other conditions, even when the same valve was fitted to a 1 1/4" port. (2) Effect on Air Flow of Masking & Flairing valve seats. [Diagram showing two graphs. The first graph plots AIR FLOW vs{J. Vickers} VALVE LIFT, with curves labelled A, B, C, ①, and ②. The second diagram is a cross-section of a valve seat, with sections labelled A, B, C.] The curves (1) and (2) show the relationship between valve lift and air flow for a clear valve with and without masking. Curves A, B, and C, however, show the different effects obtained by flairing away the seat. A.{Mr Adams} & B. Here two sets of conditions of flairing are shown. There is no masking, and for A the seat is flaired part way up, and for B the flairing is increased. The curves are roughly as shown. C. With curve C, the valve is slightly masked and flaired, and the air flow is seen to increase as soon as the valve clears the masking, increasing to the characteristic hump, and then falling back to the unmasked curve instead of the masked one. | ||