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).
Report discussing centrifugal weights, clutch thrust bearings, slow running, crank dampers and exhaust pipe design.
| Identifier | ExFiles\Box 173\4\ img127 | |
| Date | 9th December 1935 | |
| -2- The centrifugal weights used nowadays are to prevent excessive slipping during full throttle getaways and give at max. revs. as much as the springs. They rely on a /u of .25 for their woven lining. This is "Hyco" and obtainable from Raybestos. I have a sample Packard centre. For clutch thrust bearings that do not tear continuously as on 10" Borg & Beck arrangement, Oilite cages are universal and no lubrication is provided. Ll.Smith has 3 of these for test. To-day we went to G.M. Research to talk slow running and crank dampers. They are convinced the only way to get good slow running is to reduce the overlap on the camshaft. Some of the lost power is then got back by obtaining ramming effect at various speeds by tuning the exhaust and intake systems. They say one can generally get 5 to 6 M.E.P. by 30º inlet valve seats, a venturi throat and reducing the radius between the valve stem and head as far as possible consistent with strength. They adjust the slow running on new type engines complete with air intake and exhaust system by temperature measurements in each cylinder with a thermo couple. Exhaust pipes thus :- [Text from blueprint diagram] OR ROLLS-ROYCE, LTD TECHNICAL DEPT. HOOK DEC 10 1935 DESIGN WOULD PROBABLY GIVE MORE POWER. | ||