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).
Cylinder temperature, expansion, and oiling for the EAC engine.
| Identifier | ExFiles\Box 65\4\ scan0311 | |
| Date | 16th May 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. x8050 REF: Hs{Lord Ernest Hives - Chair}1/LG16.5.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} EAC. OILING. [Handwritten: x8980 (crossed out) x8050] We have measured the temperature of the cylinder barrels which project into the crankcase on the EAC. engine, by means of a thermo couple. We find that the temperature of the skirts reaches 127°C. If we assume that the top portion of the barrel is the temperature of the water (80°C), this would allow the bottom of the cylinder to expand .00212". We are testing cylinders in which the bores have been ground .002" taper. The investigations in the oiling problem show that if we get a taper wedge oil film, the oil will be difficult to keep down. EAC. CYLINDER EXPANSION. Temp. of skirts. 127°C. Temp. of bores. 80°C. Coefficient of expansion C.I. .061 X 10⁻⁴ = .00001061. Cylinder diameter. 4.25 Expansion od skirt. 4.25 X .0000106 X 127. Expansion of bore. 4.25 X .0000106 X 80. Difference in expansion. * 4.25 X .0000106 (127 - 80) * 4.25 X .0000106 X 47. * .00212 approx. Hs.{Lord Ernest Hives - Chair} | ||