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 clearance measurements after testing for Unit No. Phantom III 13 'B' Side.
| Identifier | ExFiles\Box 91\2\ scan0405 | |
| Date | 10th September 1937 | |
| 5 UNIT NO P III 13 'B' SIDE PISTON RING CLEARANCES. PASSED TO TEST:- 7-5-37 COMPLETED TEST:- 10-9-37 PISTONS E 87347 1ST & 2ND RINGS E.B. 1494 MATL Y/C (BRICO) SCRAPER RING E.B. 2686 MATL Y/C (BRICO) RUNNING TIME:- MILEAGE:- 17,110 PISTON NO | RING NO | WHEN MEASURED | PISTON GROOVE | RING THICKNESS | CLEARANCE. 1 | 1 | BEFORE | | AFTER | .101 | .0965 | .0045 | 2 | BEFORE | | AFTER | .1005 | .0975 | .003 | 3 | BEFORE | | AFTER | .179 | .1767 | .0023 2 | 1 | BEFORE | | AFTER | .101 | .0963 | .0047 | 2 | BEFORE | | AFTER | .1005 | .0975 | .003 | 3 | BEFORE | | AFTER | .1785 | .1765 | .002 3 | 1 | BEFORE | | AFTER | .101 | .096 | .005 | 2 | BEFORE | | AFTER | .1005 | .0978 | .0027 | 3 | BEFORE | | AFTER | .179 | .177 | .002 4 | 1 | BEFORE | | AFTER | .101 | .0957 | .0053 | 2 | BEFORE | | AFTER | .100 | .0976 | .0024 | 3 | BEFORE | | AFTER | .179 | .1765 | .0025 5 | 1 | BEFORE | | AFTER | .101 | .097 | .004 | 2 | BEFORE | | AFTER | .100 | .0976 | .0024 | 3 | BEFORE | | AFTER | .1785 | .1765 | .002 6 | 1 | BEFORE | | AFTER | .1015 | .0968 | .0047 | 2 | BEFORE | | AFTER | .1005 | .098 | .0025 | 3 | BEFORE | | AFTER | .1785 | .1765 | .002 EX I 220 SHEET 2. | ||