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 of standard aluminium and magnesium Bentley crankcases.
| Identifier | ExFiles\Box 88\3\ scan0039 | |
| Date | 16th April 1934 | |
| BENTLEY CRANKCASES. WEIGHT COMPARISONS OF STD. & MAGNESIUM TYPES. TOP HALF CRANKCASE TYPE WEIGHT LBS - OZS WEIGHT SAVED STANDARD TYPE, COMPLETELY STUDDED (ALUMINIUM) 53 - 0 15 ½ LBS MAGNESIUM TYPE, COMPLETELY STUDDED 37 - 8 LOWER HALF CRANKCASE TYPE WEIGHT LBS - OZS WEIGHT SAVED STANDARD TYPE (ALUMINIUM) COMPLETE WITH FITTINGS 30 - 0 8 ½ LBS. MAGNESIUM TYPE COMPLETE WITH FITTINGS 21 - 8 TOTAL SAVING IN WEIGHT, BY USING MAGNESIUM TOP & LOWER HALF CRANKCASES = 24 LBS. | ||