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 to determine gas leakage past pistons on a Phantom engine.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan092 | |
| Date | 9th November 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} ORIGINAL HS{Lord Ernest Hives - Chair}/ACL2/LG9.11.26. X858 [crossed out] X.8040 GAS LEAKAGE PAST PISTONS ON PHANTOM. We have carried out some tests to determine the leakage which took place past the pistons with various pressures. The method employed was described in a previous report. Briefly a flat plate over one of the cyl. bores replaced the head and air was alternately compressed and expanded by the piston. Any resulting leakage - which could only take place past the piston - was made up by air entering through a small non-return valve and measured by water replacement. The compression pressures were varied by adding cyls. of varying capacity. They were easily attached to the plate by a spark plug union. The general conditions were kept as near actual a running conditions as possible. The jacket water was maintained at 75°C and the oil temperature at 60°C. It was found important to keep these conditions as constant as possible as any variation would appreciably influence the results. The influence exerted by these factors we have not yet determined but have confined these tests to determining the influence of pressure. A pedestal piston with five standard 'L' section rings were the parts used for this test. Pressures up to 470 lbs/sq.in. were tested and the appended curve shews the increase of leakage with pressure. contd: | ||