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 before and after a mileage test for an Austin '8' unit.
| Identifier | ExFiles\Box 124\4\ scan0024 | |
| Date | 13th May 1941 | |
| AUSTIN "8" UNIT No. A/RA 3469 10H5 S.214 PASSED TO TEST - Record taken: 13-5-41 COMPTON DERRICK SPEEDOMETER READING:- 04863 CYLINDER BORE DIMENSIONS CYLINDER BLOCK MATL RUNNING TIME:- MILEAGE:- 4863 MEASUREMENTS AT CROWN REPRESENT MAX WEAR AT TOP OF STROKE. .350 .500 CROWN CENTRE MOUTH BORE No. POSITION CROWN BEFORE AFTER WEAR CENTRE BEFORE AFTER WEAR MOUTH BEFORE AFTER WEAR 1 A-A 2.2350 2.2363 .0013 2.2350 2.2355 .0005 2.2350 2.2356 .0006 B-B 2.2350 2.2368 .0018 2.2350 2.2354 .0004 2.2350 2.2356 .0006 OVALITY NIL .0005 NIL .0001 NIL NIL 2 A-A 2.2350 2.2367 .0017 2.2350 2.2356 .0006 2.2350 2.2358 .0008 B-B 2.2350 2.2372 .0022 2.2350 2.2357 .0007 2.2350 2.2359 .0009 OVALITY NIL .0005 NIL .0001 NIL .0001 3 A-A 2.2350 2.2368 .0018 2.2350 2.2356 .0006 2.2350 2.2356 .0006 B-B 2.2350 2.2372 .0022 2.2350 2.2356 .0006 2.2350 2.2356 .0006 OVALITY NIL .0004 NIL NIL NIL NIL 4 A-A 2.2350 2.2360 .0010 2.2350 2.2355 .0005 2.2350 2.2355 .0005 B-B 2.2350 2.2370 .0020 2.2350 2.2353 .0003 2.2350 2.2354 .0004 OVALITY NIL .0010 NIL .0002 NIL .0001 5 A-A B-B OVALITY 6 A-A B-B OVALITY | ||