Table of cylinder bore measurements showing diameter and wear after 15,000 miles.
| Identifier | ExFiles\Box 5a\1\ 01-page260 | |
| Date | 17th December 1931 | |
| CX {Major Len W. Cox - Advertising Manager} - 19 GIV 17-12-31 BORES OF CYLINDERS AFTER 15000 MILES BORE N° | MEASURED AT | DIAMETER | WEAR 1 | CROWN | 3.1515 | .0015 1 | CENTRE | 3.1515 | .0015 1 | MOUTH | 3.151 | .001 2 | CROWN | 3.1513 | .0013 2 | CENTRE | 3.1514 | .0014 2 | MOUTH | 3.1507 | .0007 3 | CROWN | 3.1517 | .0017 3 | CENTRE | 3.1516 | .0016 3 | MOUTH | 3.1507 | .0007 4 | CROWN | 3.1515 | .0015 4 | CENTRE | 3.1514 | .0014 4 | MOUTH | 3.1505 | .0005 5 | CROWN | 3.1514 | .0014 5 | CENTRE | 3.1514 | .0014 5 | MOUTH | 3.1506 | .0006 6 | CROWN | 3.1513 | .0013 6 | CENTRE | 3.1515 | .0015 6 | MOUTH | 3.1506 | .0006 DRAWING SIZE 3.150 + .1 DIA | ||
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).