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).
Report discussing piston ring leakage test results at different speeds and pressures, and proposing further tests.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan093 | |
| Date | 9th November 1926 guessed | |
| contd :- -2- The results of two speeds are given - 500 and 1000 r.p.m. - and it is interesting to note how the leakage per stroke is considerably less at the higher speed which we think is due to the time factor being smaller. It will be observed that after a pressure of 400 lbs/sq.in. is reached the leakage rapidly increases, which seems to indicate partial collapse of the piston rings. This point is clearly defined on both curves. It seems quite reasonable to suppose that excessive gas leakage past the piston could cause 'gumming' up of piston rings because during some of these tests a soldered joint in one of the capacity cylinders cracked and immediately the high pressure air started to leak the solder was melted away. We have added a plate to still further increase the pressure - to approx. 500 lbs/sq.in. - but owing to the breaking of our non-return valve we have not been able to obtain the results for this. We next propose testing the effect of the number and stiffness of the rings and finding if 'gumming' follows the weakness of the ring. Rings with and without stops will be tested. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||