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).
Table comparing the weight of parts between N.2 and O series productions, showing the total chassis weight increase.
| Identifier | ExFiles\Box 18\1\ Scan056 | |
| Date | 12th January 1933 | |
| 12.1.33. Description of Part. Old Production N.2. series. Present. Production O.Series. Chassis. Increase in weight. lbs. ozs. lbs. ozs. lbs. ozs. Synchromesh Gearbox. 172 12 201 0 28 4 6" longer bonnet 55 0 64 0 9 0 Hartford dampers to - - 17 8 17 8 Continental models. z.82572 Crankshaft, balanced type. 84 0 97 8 13 8 Longer skirt pistons. ea. 1 14½ 1 15¾ 0 6 Auto Klean. - - 5 0 5 0 Diamond engine mounting. - - 18 0 18 0 Shimmy shackle. - - 6 8 6 8 Semi expanding carb. and induction pipe. 24 12 25 0 0 4 Front brake drums ea. 25 0 33 0 16 0 G.79014 Rear brake drums. ea. 41 8 47 12 12 8 G.79012 Total increase in chassis weight :- 125 lbs 14 ozs. Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies} 1.15¼ | ||