Rolls-Royce Archives
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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 from Cambridge University Engineering Laboratory on experiments into the corrosive wear of cylinder steels over 360 hours.

Identifier  ExFiles\Box 132\4\  scan0210
Date  28th October 1938
  
REPORT

CAMBRIDGE UNIVERSITY ENGINEERING LABORATORY.

EXPERIMENTS ON THE CORROSIVE WEAR OF ROLLS ROYCE CYLINDER STEELS.

RUNNING TIME 360 HOURS.

By

WING COMMANDER W. HELMORE, Ph.D., M.Sc., F.C.S.,
M.I.P.T., M.Inst.Fuel, F.R.Ae.S.

Introductory.

The following experiments were carried out on nine marked samples of Rolls Royce cylinder steels for the purpose of determining their relative corrosion resisting properties as indicated by special laboratory apparatus installed for this purpose. (R.R., letter R.M./C.T.S. 6/R, 28/10/38).

The apparatus was primarily designed with a view to obtaining a comparision between the cylinder wear occasioned by abrasion under running conditions and that caused solely by corrosion (See report forwarded under cover of letter 16/5/38). In the course of these experiments it was found that with oil film temperatures in the neighbourhood of 160°C., a preponderating proportion of wear results from corrosion. This was confirmed by observation made under conditions in which no contact between the piston and cylinder existed. Although corrosion was observed to be most acute at a temperature of approximately 160°C. under running conditions, further corrosion was found to occur to a marked degree during the time that the engine was stationary and cooling down from this temperature to approximately normal temperature. The total corrosion measured, therefore, appeared to depend not only upon the temperature of the oil film during running, but also upon the number and frequency of stops and the duration of standing time.

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