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 profile measurements and wear data for 'Aerolite' Standard Bentley pistons following a 68-hour test.
| Identifier | ExFiles\Box 124\1\ scan0026 | |
| Date | 23th February 1939 | |
| UNIT No B.80No.1. PISTON PROFILES PISTONS 'AEROLITE' IDENTIFICATION No M.27. STANDARD BENTLEY PASSED TO TEST 9-12-38 COMPLETED TEST 23.2.39 RUNNING TIME 68 HRS. MILEAGE (18 HRS 50 MINS F.T.) [Diagrams of piston showing RELIEVED SECTION and BEDDING SECTION with measurement points A, B, C, D, E] TABLE OF MEASUREMENTS: PISTON No 1 RELIEVED SECTION: A-A: BEFORE 3.4810, AFTER 3.4810, WEAR NIL. B-B: BEFORE 3.4800, AFTER 3.4805, WEAR +.0005 C-C: BEFORE 3.4800, AFTER 3.4810, WEAR +.0010 D-D: BEFORE 3.4820, AFTER 3.4815, WEAR -.0005 E-E: BEFORE 3.4860, AFTER 3.4860, WEAR NIL. BEDDING SECTION: A-A: BEFORE 3.4810, AFTER 3.4815, WEAR +.0005 B-B: BEFORE 3.4805, AFTER 3.4805, WEAR NIL. C-C: BEFORE 3.4805, AFTER 3.4805, WEAR NIL. D-D: BEFORE 3.4355, AFTER 3.4355, WEAR NIL. E-E: BEFORE 3.4990, AFTER 3.5010, WEAR +.0020 PISTON No 2 RELIEVED SECTION: A-A: BEFORE 3.4800, AFTER 3.4803, WEAR +.0003 B-B: BEFORE 3.4795, AFTER 3.4796, WEAR +.0001 C-C: BEFORE 3.4795, AFTER 3.4796, WEAR +.0001 D-D: BEFORE 3.4815, AFTER 3.4810, WEAR -.0005 E-E: BEFORE 3.4860, AFTER 3.4855, WEAR -.0005 BEDDING SECTION: A-A: BEFORE 3.4800, AFTER 3.4800, WEAR NIL. B-B: BEFORE 3.4795, AFTER 3.4794, WEAR -.0001 C-C: BEFORE 3.4795, AFTER 3.4790, WEAR -.0005 D-D: BEFORE 3.4355, AFTER 3.4350, WEAR -.0005 E-E: BEFORE 3.4990, AFTER 3.4995, WEAR +.0005 PISTON No 3 RELIEVED SECTION: A-A: BEFORE 3.4820, AFTER 3.4825, WEAR +.0005 B-B: BEFORE 3.4820, AFTER 3.4824, WEAR +.0004 C-C: BEFORE 3.4820, AFTER 3.4820, WEAR NIL. D-D: BEFORE 3.4815, AFTER 3.4815, WEAR NIL. E-E: BEFORE 3.4845, AFTER 3.4845, WEAR NIL. BEDDING SECTION: A-A: BEFORE 3.4820, AFTER 3.4825, WEAR +.0005 B-B: BEFORE 3.4820, AFTER 3.4820, WEAR NIL. C-C: BEFORE 3.4815, AFTER 3.4818, WEAR +.0003 D-D: BEFORE 3.4355, AFTER 3.4352, WEAR -.0003 E-E: BEFORE 3.4990, AFTER 3.5002, WEAR +.0012 PISTON No 4 RELIEVED SECTION: A-A: BEFORE 3.4810, AFTER 3.4810, WEAR NIL. B-B: BEFORE 3.4805, AFTER 3.4810, WEAR +.0005 C-C: BEFORE 3.4805, AFTER 3.4805, WEAR NIL. D-D: BEFORE 3.4815, AFTER 3.4810, WEAR -.0005 E-E: BEFORE 3.4855, AFTER 3.4852, WEAR -.0003 BEDDING SECTION: A-A: BEFORE 3.4810, AFTER 3.4815, WEAR +.0005 B-B: BEFORE 3.4805, AFTER 3.4810, WEAR +.0005 C-C: BEFORE 3.4805, AFTER 3.4805, WEAR NIL. D-D: BEFORE 3.4355, AFTER 3.4350, WEAR -.0005 E-E: BEFORE 3.4990, AFTER 3.4990, WEAR NIL. PISTON No 5 RELIEVED SECTION: A-A: BEFORE 3.4820, AFTER 3.4816, WEAR -.0004 B-B: BEFORE 3.4815, AFTER 3.4816, WEAR +.0001 C-C: BEFORE 3.4815, AFTER 3.4812, WEAR -.0003 D-D: BEFORE 3.4830, AFTER 3.4825, WEAR -.0005 E-E: BEFORE 3.4860, AFTER 3.4855, WEAR -.0005 BEDDING SECTION: A-A: BEFORE 3.4820, AFTER 3.4820, WEAR NIL. B-B: BEFORE 3.4815, AFTER 3.4816, WEAR +.0001 C-C: BEFORE 3.4815, AFTER 3.4812, WEAR -.0003 D-D: BEFORE 3.4370, AFTER 3.4365, WEAR -.0005 E-E: BEFORE 3.5005, AFTER 3.5010, WEAR +.0005 PISTON No 6 RELIEVED SECTION: A-A: BEFORE 3.4820, AFTER 3.4820, WEAR NIL. B-B: BEFORE 3.4815, AFTER 3.4812, WEAR -.0003 C-C: BEFORE 3.4815, AFTER 3.4812, WEAR -.0003 D-D: BEFORE 3.4810, AFTER 3.4808, WEAR -.0002 E-E: BEFORE 3.4850, AFTER 3.4850, WEAR NIL. BEDDING SECTION: A-A: BEFORE 3.4820, AFTER 3.4822, WEAR +.0002 B-B: BEFORE 3.4815, AFTER 3.4815, WEAR NIL. C-C: BEFORE 3.4815, AFTER 3.4815, WEAR NIL. D-D: BEFORE 3.4355, AFTER 3.4355, WEAR NIL. E-E: BEFORE 3.4995, AFTER 3.5005, WEAR +.0010 | ||