Adoption of a slipper drive to eliminate engine gear rattle and reduce costs on the Wraith engine.
| Identifier | ExFiles\Box 7\8\ X 607 Camshaft-page23 | |
| Date | 27th April 1938 | |
| -2- RHO.1/WJ.27.4.38. Cont'd. {John DeLooze - Company Secretary} Whilst it is admitted that the general conditions of Ph.lll engine are different and the crankshaft is more rigid, we did have some trouble with engine gear rattle on the pick up on this engine, but we were able to eliminate this owing to the fact that Ph.lll engine is fitted with a separate spring drive and adjustment to the spring drive damper overcame this. This, in conjunction with past experience, is the reason why it is suggested that from a production point of view it should be adopted on Wraith. The cost of the low inertia type damper at the time of its introduction on 20/25 HP. in 1932 was £6. 19. 0d. as compared with £7. 7. 0d. for the slipper drive which it replaced, but this small increase could probably be reduced by improved manufacturing methods, and in any case a slight increase in initial cost would be repaid over a number of engines due to the resulting reduction of test troubles and service complaints. ANYTHING WHICH CAN BE ADOPTED TO ELIMINATE TROUBLES ON TEST IS AN ECONOMY. Should the adoption of this slipper drive also render it definitely possible to dispense with the camshaft balancer unit, a direct saving of £2. 10. 0d. would result. RHO. [Signature] | ||
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).