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).
Modifications and improvements to the Bentley starter motor.
| Identifier | ExFiles\Box 3\4\ 04-page396 | |
| Date | 12th July 1933 | |
| To Hurst.) From E.{Mr Elliott - Chief Engineer} c. Mr. Hives. Mr. NWC. SFT.{Mr Swift} Improved Bentley Starter Motor. --------------------------- This confirms our discussion that the two motors of increased torque type being made up for test on the Bentley should be instructed with spindles .5" longer to take bijur pinion couplings with two extra plates, one driving and one driven, and two extra corks. This modification will put up the torque capacity of the pinion drive by 66%. An extended cap will also be required for carrying the outboard ball bearing in a position .5" farther back than at present. Owing to the difficulty of trying the old and the new ratios comparatively one against the other, it is decided that we will stick to the present Bentley starter gear ratio and this will not interfere with the flywheel. An investigation will be made to see what further difficulty is encountered in withdrawing the longer pinion complete with motor from the engine. We anticipate it will be necessary to cut away still further some of the metal inside the housing. We are looking upon this more powerful starter motor as an improvement which is wanted as soon as possible, and to come on after the first 15 cars. We believe the general design of the Bentley as it is being made will go on for several hundred sets after the present 200 in hand, and the sequence starter motor which we are keeping for the separately mounted Bentley engine need not be considered for the present. This motor, however, is needed for J.J. chassis on which we are concentrating as our replacement chassis for the 20/25. E.{Mr Elliott - Chief Engineer} | ||