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 in engine bores and pistons for a specific chassis.
| Identifier | ExFiles\Box 103\2\ scan0015 | |
| Date | 3rd May 1939 | |
| REPORT RE WEAR IN BORES & PISTONS. Fitter: Mann Egerton Chassis No.: Packard (E.T.) Job No.: Date: 3.5.1939 Mileage: 28213 TABLE 1: BORES BORE | NOMINAL | TAPER | OVAL | M | C | T 1 | 3.250" | + .0085 | .0015 | 1 | 4 | 8 1/2 2 | " | + .0085 | .002 | 1 | 4 | 8 1/2 3 | " | + .0075 | .002 | N. | 3 | 7 1/2 4 | " | + .0075 | .001 | 1/2 | 3 1/2 | 7 1/2 5 | " | + .009 | .002 | 1 1/2 | 4 1/2 | 9 6 | " | + .008 | .001 | 1/2 | 3 | 8 SMALL ENDS: - REMARKS: - TABLE 2: PISTONS PISTONS | TYPE | TOP | BOTTOM. 1 | | - .0005 | - .0035 2 | "INVARSTRUT" | - .001 | - .0035 3 | fitted with | - .0025 | - .0045 4 | 2. compression rings | - .001 | - .0035 5 | 1. Scraper ring. | - .002 | - .0025 6 | | - .001 | - .0035 Signature: J.B. | ||