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).
Technical letter discussing methods for piston and crankshaft testing, including oil pressure application and pump configuration.
| Identifier | ExFiles\Box 42\2\ Scan050 | |
| Date | 15th February 1916 | |
| R.R. 235 a (400 T) (S.C. 538. 15-2-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1546. -3- E1/G26718. Contd. be small relative to the crankshaft, and a deflection meter should be fitted to the free end of crank to give us some indication of the angle through which the crank is deflected. The oil pressure may be applied either to give the piston test alone, or the piston and crankshaft test combined, just as is most convenient. The force should be applied by the pattern of small oil pump already described. Two cylinders of the three-cylinder pump may be used for the two high pressures in the cylinders, as Mr. Royce does not think the regular spacing of the impulses would amtter, or on the other hand, it is a simple matter to replace the eccentric shaft of the pump with a new shaft having rhe eccentrics equally spaced for twp zylinders, so that the impulses would be even in point of time. You may find it convenient to work the complete piston and crankshaft test together, obtaining the low pressure oil for the underside of the piston by means of an arrangement embodying a pressure reduction valve from the oil supply to the short standard working cylinder, applying torque in the reverse direction. Referring again to thr question of getting rid of the air from the working cylinders, which is of the utmost importance, affecting as it does the size of the pumo required for the test, we think the oil should be fed in at the bottom of the working cylinders, and the pressure limiting relief valves should be placed on top of the working cylinders. I believe I have now given you the whole of the Contd. | ||