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).
Progress report on engine testing, detailing gap wear measurements, benefits of water cooling, and detonation performance.
| Identifier | ExFiles\Box 133\1\ scan0069 | |
| Date | 30th June 1936 | |
| -2- HS{Lord Ernest Hives - Chair}/Ed.{J. L. Edwards}1/JH.30.6.36. 1 2 3 4 5 Gap New .012 .012 .012 .014 .014 Gap after 53 hrs. .015 .014 .014 .018 .015 The other unit so treated has run intermittently for just over 100 hours, and is still in very good condition, though no figures are as yet available. From the car side of the question we understand that Rovers have run for 50,000 miles without any perceptible wear, but we ourselves have no figures. (b) Up to date we have not quite completed our tests on the water cooled units, but from the information we have so far gathered we should say that water cooling is a definite advantage. From the point of view of detonation we find that there is a gain in permissible m.e.p. of nearly 20% for the same detonation intensity at the same fuel consumption, speed being constant at 4000 R.P.M. Power and consumption tests are being carried out, and on completion of these a full report showing the differences in temperature power etc. between the two units will be made out, and a copy forwarded to you. Yours faithfully, FOR ROLLS ROYCE LTD. | ||