Modification to prevent clutch slipping on high compression 20/25 HP cars.
| Identifier | ExFiles\Box 5\6\ 06-page067 | |
| Date | 30th April 1930 | |
| BY. {R.W. Bailey - Chief Engineer} From Hs {Lord Ernest Hives - Chair} /AJL. c. to EP. {G. Eric Platford - Chief Quality Engineer} c. to MX. {John H Maddocks - Chief Proving Officer} 15300 Hs {Lord Ernest Hives - Chair} /AJL.1/W.30.4.30. CLUTCH SPRINGS FOR HIGH COMPRESSION 20/25 HP. CARS. It is evident, from our own experimental experience, that the high compression 20/25 HP. cars will be troubled with clutch slipping if no attempt is made to strengthen up the clutch springs. There were a number of chassis produced before the final clutch spring modification (20% increase) came on to production, and these must be altered. It is a costly job to modify these existing clutches to the latest scheme. We should recommend for these that the existing clutch springs be strengthened up by using a packing washers .105" thick behind each spring. This has the effect of putting up the normal load on each clutch spring from 105 to 117 lbs - i.e. an increase of 11.5%. This increase does not produce an objectionably high clutch pedal pressure and is sufficient to give freedom from clutch slip. Hs {Lord Ernest Hives - Chair} /AJL. | ||
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).