Measurement data sheet for pistons and rings after a 17,400-mile test in France.
| Identifier | ExFiles\Box 82\5\ scan0190 | |
| Date | 19th December 1936 | |
| B. 3 UNIT PISTONS & RINGS AFTER 17,400 MILES IN FRANCE DIAGRAM LABELS: RELIEVED PORTION: A, B, C, D, E BEDDING PORTION: A1, B1, C1, D1, E1 TEST DETAILS: PISTONS E.B. 2844 IDENTIFICATION N° 0.14 1ST COMP. RING E.60820 2ND COMP. RING 'L' SECTION E.61123 SCRAPER RING E.60821 PASSED TO TEST 19.12.36 TABLE DATA: N° | | A | B | C | D | E | A.1 | B.1 | C.1 | D.1 | E.1 || RING GAPS | 1ST | 2ND | SCRAPER ---|---|---|---|---|---|---|---|---|---|---|---||---|---|---|--- 1 | BEFORE | 3.4828 | 3.4828 | 3.4829 | 3.4840 | 3.4845 | 3.4830 | 3.4829 | 3.4815 | 3.4975 | 3.4980 || | .008 | .009 | .010 | AFTER | 3.4832 | 3.4831 | 3.4829 | 3.4840 | 3.4852 | 3.4837 | 3.4823 | 3.4817 | 3.4985 | 3.4977 || | .016 | .014 | .017 | DIFF. | +.0004 | +.0003 | NIL | NIL | +.0007 | +.0007 | -.0006 | +.0002 | -.001 | -.0003 || | +.008 | +.005 | +.007 2 | BEFORE | 3.4820 | 3.4820 | 3.4820 | 3.4832 | 3.4842 | 3.4822 | 3.4820 | 3.4815 | 3.4973 | 3.4978 || | .008 | .010 | .010 | AFTER | 3.4822 | 3.4823 | 3.4822 | 3.4833 | 3.4851 | 3.4831 | 3.4822 | 3.4818 | 3.4964 | 3.4974 || | .014 | .014 | .016 | DIFF. | NIL | +.0003 | +.0002 | +.0001 | +.0009 | +.0009 | +.0002 | +.0003 | -.0009 | -.0004 || | +.006 | +.004 | +.006 3 | BEFORE | 3.4820 | 3.4820 | 3.4820 | 3.4830 | 3.4840 | 3.4822 | 3.4822 | 3.4820 | 3.4970 | 3.4975 || | .010 | .010 | .010 | AFTER | 3.4823 | 3.4822 | 3.4823 | 3.4832 | 3.4853 | 3.4831 | 3.4821 | 3.4819 | 3.4958 | 3.4967 || | .018 | .014 | .015 | DIFF. | +.0003 | +.0002 | +.0003 | +.0002 | +.0013 | +.0009 | -.0001 | -.0001 | -.0012 | -.0008 || | +.008 | +.004 | +.005 4 | BEFORE | 3.4820 | 3.4820 | 3.4820 | 3.4830 | 3.4830 | 3.4822 | 3.4820 | 3.4815 | 3.4970 | 3.4975 || | .010 | .008 | .009 | AFTER | 3.4837 | 3.4837 | 3.4838 | 3.4847 | 3.4847 | 3.4843 | 3.4841 | 3.4842 | 3.4943 | 3.4968 || | .020 | .014 | .015 | DIFF. | +.0017 | +.0017 | +.0018 | +.0017 | +.0017 | +.0021 | +.0021 | +.0027 | -.0027 | -.0007 || | +.010 | +.006 | +.006 5 | BEFORE | 3.4822 | 3.4822 | 3.4820 | 3.4830 | 3.4835 | 3.4830 | 3.4825 | 3.4825 | 3.4972 | 3.4977 || | .010 | .010 | .010 | AFTER | 3.4827 | 3.4824 | 3.4822 | 3.4830 | 3.4831 | 3.4837 | 3.4825 | 3.4820 | 3.4964 | 3.4983 || | .017 | .015 | .018 | DIFF. | +.0005 | +.0004 | NIL | NIL | -.0004 | +.0007 | NIL | -.0005 | -.0008 | +.0006 || | +.007 | +.005 | +.008 6 | BEFORE | 3.4810 | 3.4810 | 3.4810 | 3.4835 | 3.4840 | 3.4810 | 3.4800 | 3.4793 | 3.4970 | 3.4975 || | .008 | .010 | .008 | AFTER | 3.4816 | 3.4813 | 3.4813 | 3.4842 | 3.4860 | 3.4813 | 3.4801 | 3.4798 | 3.4964 | 3.4972 || | .016 | .014 | .015 | DIFF. | +.0006 | +.0003 | +.0003 | +.0007 | +.002 | +.0003 | +.0001 | +.0005 | -.0006 | -.0003 || | +.008 | +.004 | +.007 FOOTNOTE: N° 4 PISTON BADLY CRACKED (SEE EX. I 160 HEREWITH) | ||
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).