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).
Record of piston weights for various engine types.
| Identifier | ExFiles\Box 3\3\ 03-page021 | |
| Date | 13th November 1911 | |
| B.B.B. No. 22262 A.S.S.B. Co.Ltd. Engineers 3400 x200 Pistons - Weight of. Type E 109. Piston & rings 4 lbs 8 oz. (bronze webs.) (Forward) (conical & wiper rings) gudgeon pin, (bolted in) 8 1/4 oz. Type E 553. old style, concave top no internal or cross webs, bottom bored flush & otherwise cleaned. d.tto 3 lbs 12oz. gud. pin alone 8 oz. circlips & plug 1/4 oz. Type E 1429. (new exp. type, 2 rings below gudgeon pin) d.tto 4 lbs 11 1/2 oz. gud. pin (and circlips) 9 1/4 oz. 5 4 3/4 LP{Mr Lappin} 13/11/11 | ||