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 in bores and pistons for a Chevrolet 30 chassis.
| Identifier | ExFiles\Box 103\2\ scan0021 | |
| Date | 30th March 1939 | |
| REPORT RE WEAR IN BORES & PISTONS. ======================== Fitter: Pass & Joyce. Chassis No.: Chevrolet. 30. (G.A.) Job No.: Date: 30. 3. 1939. Mileage: 22562 BORE TABLE: BORE | NOMINAL | TAPER | OVAL | M | C | T 1 | 3.500" | +.0115" | .0025" | 4 | 1 1/2 | 2 | " | +.008" | .0025" | 3 | 8 | 3 | " | +.0085" | .0025" | 3 | 8 1/2 | 4 | " | +.004" | .001" | 3 | 7 | 5 | " | +.008 | .003" | 2 | 8 | 6 | " | +.0075" | .003" | 1 1/2 | 7 1/2 | SMALL ENDS:- REMARKS:- PISTONS TABLE: PISTONS | TYPE | TOP | BOTTOM. 1 | 2 | Cast iron 3 | Slipper type pistons 4 | Fitted with 5 | 2. Compression rings 6 | 1. Scraper ring. Signature: J.B. | ||