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).
Comparative table of component changes and specifications for a Bentley H'Power engine.
| Identifier | ExFiles\Box 111\2\ scan0229 | |
| Date | 26th August 1937 | |
| -2- 26.8.37. TITLE REMARKS BENTLEY H'POWER. Spring drive. It is hoped to be able to dispense with this, but in the present analysis it is included. 16 3/4 16 3/4 Lower Half.Oil. Sump.etc. The actual sump is to be changed from A/C to pressed steel. 25 10 Filter. This is to be changed to a floating type. 1 1/4 1 Oil Level Indicator.etc. No serious change. 2 2 Nuts Studs Washers etc. Approximately the same. 5 5 Wheelcase etc. This is to be reduced in size as only three gears will be used. 6 1/2 3 1/2 Oil distributing Pipes. External pipes are assumed the same. Oil feeds to the main bearings are however, omitted. 3 1/2 2 Oil Filler. No Change. 1 3/4 1 3/4 Oil Pump. No Change. 3 3 Cooling System. Fan & Drive. No change. 7 3/4 7 3/4 Water Pump & Drive. These are being modified, the water pump being driven from the end of the dynamo shaft (exclusive of distributor drive) 10 8 | ||