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).
Wear measurements for engine bores and pistons.
| Identifier | ExFiles\Box 132\4\ scan0246 | |
| Date | 14th March 1940 | |
| REPORT RE WEAR IN BORES & PISTONS ======================== Fitter Chassis No. G-28-VI Job No. 33712 Date 14- 3- 40 Mileage 54,245 Speedo Reading BORE | NOMINAL | TAPER | OVAL | M | C | T 1 | 3.500 | .0065 | .002 | N | 3 1/2 | 6 1/2 2 | 3.500 | .0045 | .002 | N | 2 1/2 | 4 1/2 3 | 3.500 | .004 | .001 | N | 3 | 4 4 | 3.500 | .005 | .001 | N | 2 1/2 | 5 5 | 3.500 | .0055 | .0025 | N | 2 1/2 | 5 1/2 6 | 3.500 | .0065 | .0005 | N | 3 | 6 1/2 SMALL ENDS:- REMARKS:- PISTONS | TYPE | TOP | BOTTOM. 1 2 3 4 5 6 Signature N. Rogers | ||