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).
Tests conducted for an extra lubrication scheme for cylinders, scheme Hs.222.
| Identifier | ExFiles\Box 103\4\ scan0056 | |
| Date | 19th July 1929 | |
| FILES. [Handwritten top middle] A 5013 [Handwritten top right] H70153 19.7.29. EXTRA LUBRICATION - CYLINDERS - SCHEME Hs.{Lord Ernest Hives - Chair}222. At the commencement of these tests as many standard parts as possible from E.17144 arrangement were used in conjunction with the special parts required by Hs.{Lord Ernest Hives - Chair}222. It was soon discovered however that the spring in use was unsuitable, and that a longer, lower rating spring would be required. In order to accommodate this longer spring it was necessary to remove the filter, it will be possible, however, to build a smaller one inside the spring. The spring guide - at the end of the filter body - had to be shortened to allow the maximum stroke of the delay valve to be used. The flap-valve on the delay valve piston was made of celluloid, star shaped for convenience, and worked quite satisfactorily. It was decided to use Amber A gear oil in the delay cylinder, the period of delay to be 10 mins. In this case with a release orifice of .032" diameter drilled through the piston near to the centre and the spring which we had man-aged to adapt to return the release valve, the required delay was obtained. It is quite possible to vary the delay period by means of the two glands. The maximum piston movement used during these tests was .600", this allowed clearance at the top of the stroke, making sure that the release valve could seat thoroughly. The delay unit was then arranged in circuit with a pressure pump, and a crankcase fitted with a jet to each cylinder bore, the release valve being connected to the dashboard end of the crankcase supply pipe. The first tests were made with .075" diameter jets, and 1 1/4 lbs/sq.in. oil pressure, but it was soon obvious that this supply was too small and the pressure was increased to the standard intermediate pressure, 3 1/2 lbs/sq.in. The changes were rung on the jet sizes at this pressure, ranging from .025" to .075" diameter orifices, always but almost always the decrease in pressure along the pipe prevented a reasonable flow being obtained through No.1 jet. | ||