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).
Engine test of austenitic liners, detailing issues of scoring and distortion.
| Identifier | ExFiles\Box 179b\2\ img039 | |
| Date | 13th October 1932 | |
| No. from H.J. Royce. AUSTENITIC LINERS. This liner was run on the Kestrel single cylinder unit in conjunction with a piston R.37728 S/1 & R.{Sir Henry Royce} Alloy V.C.33. The engine was run light for 2 hours and, the conditions of the walls appearing satisfactory as observed with a pesh lamp, it was then run at T.P.N. full throttle for a further two hours. The I.M.E.P. obtained was 159 as compared with 143 with a previous piston and standard liner. On shutting down the engine appeared to be rather tight. Examination of the piston and liner revealed the following :- (1) The liner was rather scored particularly for one uppermost inch of the piston travel. The scoring corresponded with that on the piston. In view of the hardness of the liner and the duration of the run the condition is not considered satisfactory. (2) The piston showed signs of having been tight and the scoring was rather pronounced. The scoring corresponded with the positions of the oiling down studs. An increased clearance all over would have been an advantage. It is thought that the trouble was probably due to increased expansion of the austenitic liner, causing excessive tightening and distortion of the liner. The expansion of the austenitic liner is 30% higher than the standard liner. H.J. Royce. | ||