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).
Outlining proposed engine and chassis modifications for the next 15,000 miles test.
| Identifier | ExFiles\Box 83\1\ scan0115 | |
| Date | 22th May 1936 | |
| To Sg.{Arthur F. Sidgreaves - MD} & Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} C. to By.{R.W. Bailey - Chief Engineer} x 200A Ha/Rm.{William Robotham - Chief Engineer}5/KW.22.5.36. 6-B-IV - Next 15,000 Miles Test. In view of the fact that the last 15,000 miles test has shown that modifications to the oil filtration and oil supply are desirable with Hall's metal bearings, we are proposing to make 6-B-IV test primarily a try-out of engine modifications. The modified specification is as follows :- ENGINE. (1) Improved oil filtering. (2) Increased oil circulation, larger oil pump. (3) Improved crankshaft damper. (4) Turbulent head with lips removed and ignition governor to suit. (5) Improved piston rings to take care of increased oil supply. (6) Clutch material similar to the Ph.III and ventilated casing. 11" Borg & Beck Instead. (7) Improved crankshaft balance weight scheme. Not fitted. (8) Improved exhaust valves of stellited low expansion material. (9) Cantilever throttle controls. (10) Induction system modified to improve idling. CHASSIS. (1) 20/25 type rubber engine mounting. (2) Cantilever pedals. (3) Standard radiator mounting, Mark VI matrix. | ||