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).
Visit to the I.A.E. Research Dept. to discuss cylinder bore wear and oil consumption.
Identifier | ExFiles\Box 132\4\ scan0079 | |
Date | 17th August 1937 | |
To Ey. from Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. to Da.{Bernard Day - Chassis Design} c. to Mx.{John H Maddocks - Chief Proving Officer} [Handwritten] 1124 also 1220 Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}5/AP.17.8.37 REPORT ON VISIT TO I.A.E. RESEARCH DEPT. 12.8.37 This visit was paid to the I.A.E. Research Dept. in order to discuss Cylinder Bore Wear and Oil Consumption problems with Mr. C.G. Williams, Director of Research. The following points were discussed:- (1) Split Skirt V Solid Skirt Pistons and effect on bore wear. No actual comparisons had been made between the two types of pistons, but they had carried out tests with various skirt clearances on solid skirt pistons. Their results showed that increased piston clearance led to increased bore wear, they had no experience with pistons fitted with no actual clearance, such as our own split skirt piston. They were limited of course to approximately .0025" clearance with solid skirt pistons and their tests were all done on pistons having clearances from .0025" upwards. (2) Ring Pressure and Bore Wear. Their tests show that increased ring pressure means increased bore wear but not necessarily that wear increased in proportion to increase in ring pressure. They have done tests which show that with narrow rings having the same radial pressure/sq.inch as broad rings, both ring wear and cylinder wear is increased with the narrow rings. (3) Percentage wear due to Corrosion and Abrasion. When asked what percentage of wear was due to corrosion and what percentage due to abrasion on an average car in this Country, Williams could not give any definite figures. He stated that condensation of crankcase vapour tended to form sludge partly due to acids contained in the condensate and this had an abrasive action. He was still inclined to think that corrosion caused the greater part of wear in this country. (4) Cylinder Material. They are just starting work investigating wearing properties of various cylinder materials but had yet no results of their own. Williams stated that from the experience of other people the best cylinder materials at the continued | ||