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).
Comparison table detailing weight reductions for Bentley components by changing materials.
| Identifier | ExFiles\Box 88\3\ scan0050 | |
| Date | 1st May 1934 guessed | |
| K25G BENTLEY WEIGHT REDUCTION. Reduction. Top Half Crankcase Aluminium Magnesium Standard type 53 lbs. 37 lbs 8 ozs 15 lbs 8 ozs. completed studded. Lower Half Crankcase Aluminium Magnesium Complete with Fittings.30 lbs. 21 lbs 8 ozs 8 lbs 8 ozs. Steering Box & Column. Bentley Type Peregrine Type 42 lbs. 30 lbs 15 ozs 11 lbs 1 oz. Dashboard. Aluminium Peregrine Type 28 lbs 7 ozs 19 lbs 6 ozs 9 lbs 1 oz Gearbox. 20/25 HP. Peregrine in Magnesium Type 105 lbs 22 lbs 127 lbs. (Handwritten Correction: 25. IN Magnesium 118.5) (Handwritten Correction: 8.5 LBS) Cylinder Head (Comp. Cast-Iron (Handwritten: Aluminium) with valves & Springs).71 lbs 14 ozs 36 lbs 1 oz 35 lbs 13 ozs. Radiator Standard Marston Mark III with Shutters & Fitments. (Full of water). 106 lbs. Harrison Vee Type with Shutters & Fitments. (Full of water). 77 lbs. 29 lbs. Clutch Pit. Aluminium Magnesium 12 lbs 12 ozs 8 lbs 8 ozs 4 lbs. 4 oz. Shock Damper Casings (4) Aluminium Magnesium 9 lbs 8 ozs 6 lbs 6 ozs 3 lbs 2 ozs. Dynamo. Old Type New Type (40/50) 30 lbs. 22 lbs 10 ozs 7 lbs 6 ozs. Floorboards. Wooden Type Pressed Metal Type. 17 lbs 12 ozs 9 lbs 8 ozs 8 lbs 4 ozs. Radiator Shutters Shutters (Handwritten: Grille & Support brkts. 7 lbs.) against new type Grille.11 lbs 12 ozs Rad. Thermostat (Handwritten: Thermostat for use with Radiator fitted with Grille. 2 lbs.) (Handwritten note: 4 lbs 2 ozs) 1 lb. 6 ozs. | ||