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).
Piston ring gap measurement and wear test results for Unit No. Ph III 13, 'A' Side.
| Identifier | ExFiles\Box 91\2\ scan0406 | |
| Date | 10th September 1937 | |
| 9 UNIT NO Ph III 13 PASSED TO TEST :- 7-5-37 COMPLETED TEST :- 10-9-37 PISTON RING GAPS 'A' SIDE WORKING GAP FREE GAP COMPRESSION RING 1st & 2nd E.B. 1484 1/c (BRICO) SCRAPER RING E.B. 2686 1/c (BRICO) RUNNING TIME :- — MILEAGE :- 17,110 TABLE DATA: PISTON No | RING No | FREE GAP: BEFORE | FREE GAP: AFTER | FREE GAP: WEAR | WORKING GAP: BEFORE | WORKING GAP: AFTER | WORKING GAP: INCREASE IN WEAR 1 | 1 | | | | .006 | .010 | .004 1 | 2 | | | | " | .010 | .004 1 | 3 | | | | " | .012 | .006 2 | 1 | | | | " | .010 | .004 2 | 2 | | | | " | .010 | .004 2 | 3 | | | | " | .010 | .004 3 | 1 | | | | " | .010 | .004 3 | 2 | | | | " | .010 | .004 3 | 3 | | | | " | .010 | .004 4 | 1 | | | | " | .010 | .004 4 | 2 | | | | " | .010 | .004 4 | 3 | | | | " | .010 | .004 5 | 1 | | | | " | .010 | .004 5 | 2 | | | | " | .010 | .004 5 | 3 | | | | " | .010 | .004 6 | 1 | | | | " | .010 | .004 6 | 2 | | | | " | .010 | .004 6 | 3 | | | | " | .012 | .006 Ex I 221 SHEET 1. | ||