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 vehicle components, comparing Humber and B.V. Al. engine specifications.
| Identifier | ExFiles\Box 132\2\ scan0061 | |
| Date | 3rd August 1939 guessed | |
| Item No. | GROUP | Humber lbs. | B.V. Al. engine lbs. | Difference lbs. Humber Saving. | Difference lbs. B.V. Saving. ---|---|---|---|---|--- | | 3480 | 3915 | | 1. | Engine with flywheel, clutch, c. casing pedal & mech. starter, dyno. manifolds, carb. | 701.4 | 592. | 119 | 2. | Gearbox & lever without servo parts. | 93.6 | 81.7 | 12 | 3. | Rear Axle (Floating) with brake shoes back plates, and operating mech. which is carried on axle, without drums. | 196. | 183.5 | 12.5 | 4. | Rear brake drums (Both 1/C. | 24 | 40.5 | | 16.5 5. | Rear springs shackles, clips, buffers | 100.4 | 93.2 | 7.2 | 6. | Rear dampers, bkts. + roll bar on Humber. | 23 | 29.3 | | 6.3 7. | Prop. shaft (B.V. Duplex including bearing. | 17.9 | 27.2 | | 9.3 8. | Steering Col. controls etc. but no rods and levers. | 30 | 38.5 | | 8.5 9. | Steering rods and levers, including pivots. | 28.8 | 32 | | 3.2 10. | Front suspension with dampers and fittings without springs or pivots. | 61.5 | 86 | | 24.5 11. | Front springs with buffers, clips etc. | 57 | 34 | 23 | 12. | Front brakes, hubs, back-plate shoes (without drums) and respective op. mech carried on back plate. | 42.2 | 47.9 | | 5.7 13. | Front drums 1/C. | 24 | 40 | | 16 14. | Brake op. mech) (B.V. including with pedal and ) (servo & rods hand lever ) (except those on ) (rear axle, Humber > (with master cylinder (but pipe line is on (frame. | 10.5 | 50.2 | | 39.7 | | | | | | | | Total: | 1376.0 | | ||