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 barrel temperature and expansion for the EAC engine, focusing on oiling issues.
| Identifier | Morton\M3.1\ img014 | |
| Date | 16th May 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hsl/LG16.5.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to FR. H.{Arthur M. Hanbury - Head Complaints} c. to DA.{Bernard Day - Chassis Design} EY. c. to WOr.{Arthur Wormald - General Works Manager} EAC. OILING. 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. .1061 X 10^-4 = .00001061. Cylinder diameter. 4.25 Expansion of 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} | ||