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).
Weight comparison table for various chassis components between a Humber S.S. and a B.V. Aluminium engine model.
| Identifier | ExFiles\Box 100\3\ scan0083 | |
| Date | 3rd August 1939 guessed | |
| -2- ITEM NO. | GROUP. | Humber S.S. lbs. | B.V. Al. engine lbs. | Difference lbs. Humber Saving. | Difference lbs. B.V. Saving. ---|---|---|---|---|--- 15. | Frame & Fittings, step irons wing stays, engine mountings & rubbers. (6 lbs) | 227 | 368 | 141 | 16. | Fuel system (including pump on B.V.) | 25.1 | 43.1 | 18 | 17. | Exhaust system. | 33.8 | 58.8 | 25 | 18. | Chassis electrical & Instruments (less electrical units on engine) | 114.2 | 138.3 | 24 | 19. | Wheels & Tyres (4 only) B.V. 6.5 x 16 Humber 6.0 x 16. | 214.5 | 238 | 23.5 | 20. | One shot lub. system. | | 18.7 | | 18.7 21. | Radiator with shell bkts. tierods etc. | 71.6 | 75 | 3.4 | 22. | Bonnet. | 47 | 57 | 10 | 23. | Bumpers, bkts. jack rests. | 50.7 | 51.5 | | .8 24. | Pressed steel dash. (part of Humber body) | | 16.5 | | 16.5 25. | Centre floor board, apron, sundry bkts. | | 37.5 | | 37.5 26. | Damper control. | | 6.5 | | 6.5 27. | Spare wheel & tyre. | 53½ | 59.5 | 6 | 28. | Tools, starting handle jack. | 23.1 | 22.6 | | .5 | Sum of above, chassis dry | 2272 | 2566 | | 29. | Chassis items unaccounted for for 9.B.V. chassis weighed dry. | | 124 | | 124 | | | 2690 | | 30. | + petrol, oil, water approx. | 130 | 154 | | | ||