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).
Cylinder bore dimension measurements for a Bentley '7' Unit after 57,000 miles of running.
| Identifier | ExFiles\Box 144\3\ scan0043 | |
| Date | 4th December 1935 | |
| TITLE: BENTLEY '7' UNIT - AFTER 57,000 MILES RUNNING - CYLINDER BORE DIMENSIONS DETAILS: CYLINDER BLOCK:- E.B. 89. - MATL Y/e DRG: SIZE BORE: 3.250+.1. NOTE: DIMS. 'AA{D. Abbot-Anderson}' TAKEN AT RT ANGLES TO C'SHAFT. DIMS. 'BB' TAKEN PARALLEL TO C'SHAFT. Diagram Labels: CROWN, CENTRE, MOUTH Diagram Dimensions: 3.80", .5" TABLE DATA: Cylinder 1: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.2515, BB=3.2505, Ovality=.001, Wear=NIL. AV=3.251. - Centre: AA{D. Abbot-Anderson}=3.252, BB=3.2525, Ovality=.0005, Wear=.00075. AV=3.2515. - Crown: AA{D. Abbot-Anderson}=3.2535, BB=3.2535, Ovality=NIL., Wear=.0025. AV=3.251. Cylinder 2: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.25175, BB=3.25025, Ovality=.0015, Wear=.001. AV=3.250. - Centre: AA{D. Abbot-Anderson}=3.252, BB=3.253, Ovality=.001, Wear=.002. AV=3.2505. - Crown: AA{D. Abbot-Anderson}=3.2535, BB=3.2535, Ovality=NIL., Wear=.0035. AV=3.250. Cylinder 3: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.25175, BB=3.250, Ovality=.00175, Wear=.00087. AV=3.250. - Centre: AA{D. Abbot-Anderson}=3.2515, BB=3.25275, Ovality=.00125, Wear=.00162. AV=3.2505. - Crown: AA{D. Abbot-Anderson}=3.25325, BB=3.25375, Ovality=.0005, Wear=.0035. AV=3.250. Cylinder 4: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.2515, BB=3.250, Ovality=.0015, Wear=.00075. AV=3.250. - Centre: AA{D. Abbot-Anderson}=3.251, BB=3.2525, Ovality=.0015, Wear=.00125. AV=3.2505. - Crown: AA{D. Abbot-Anderson}=3.2525, BB=3.25375, Ovality=.00125, Wear=.00312. AV=3.250. Cylinder 5: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.2515, BB=3.250, Ovality=.0015, Wear=.00075. AV=3.250. - Centre: AA{D. Abbot-Anderson}=3.251, BB=3.25225, Ovality=.00125, Wear=.00112. AV=3.2505. - Crown: AA{D. Abbot-Anderson}=3.2525, BB=3.2535, Ovality=.001., Wear=.003. AV=3.250. Cylinder 6: - Test: * *, NEW - Mouth: AA{D. Abbot-Anderson}=3.25125, BB=3.2505, Ovality=.00075, Wear=.00082. AV=3.250. - Centre: AA{D. Abbot-Anderson}=3.2515, BB=3.2525, Ovality=.001, Wear=.0015. AV=3.2505. - Crown: AA{D. Abbot-Anderson}=3.253, BB=3.254, Ovality=.001, Wear=.0035. AV=3.250. | ||