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).
The effect of jacket water temperature on detonation in 'Buzzard' engines.
| Identifier | ExFiles\Box 179\2\ img009 | |
| Date | 4th December 1931 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Yng. c. to Bg. Wor.{Arthur Wormald - General Works Manager} c. to Rg.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to Dy.{F R Danby} c. to Mr. Jaques. Hs.{Lord Ernest Hives - Chair}/Yng.1/MJ.4.12.31. x3991 x4483 'BUZZARD' ENGINES. THE EFFECT OF JACKET WATER TEMPERATURE ON DETONATION. When the 110º "R" Type camshafts were fitted to the Buzzard engine, we reported a reduction in the intensity of detonation. As it is intended to run the next Buzzard type test under evaporatively cooled conditions, tests have recently been made to find the effect of the increased jacket temperatures on detonation. The engine used was Buzzard MS.3, a standard moderately supercharged engine with 110º camshafts. Comparative power and detonation curves were taken at full throttle over the speed range 2300 - 1800 R.P.M. with the water outlet temperatures at the normal figure of 75ºC. and also at 100ºC. The appended curve (71 'H') shows the results obtained. At the normal speed of 2300 R.P.M. the effect of the increased water temperature is to increase the detonation intensity from 2º to 7.5º, and to cause a reduction in power amounting to approximately 1%. The fuel consumption remains the same in both cases. This is characteristic of the whole speed range. SUMMARY. Running the engine under evaporatively cooled conditions causes a slight increase in the detonation rating and a slight reduction in power. It should be noted, however, that even under these conditions the detonation rating of 7.5º represents an improvement upon that obtained with the 114º type camshafts - (Report Ref: Ha/Dor.{Mr Dorey}1/MJ.27.10.31) - under normal running conditions which was 7.12º. Ha/H.R.Young. Attached: Curve 71 'H'. | ||