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).
Letter from Leyland Motors discussing the performance and cost of different cylinder liners and a two-leading-shoe brake system.
| Identifier | ExFiles\Box 140\3\ scan0210 | |
| Date | 28th July 1938 guessed | |
| Leyland Continuation of a letter From LEYLAND MOTORS LIMITED. (2) chrome type of liner gives the best results. The information you require with regard to the fitting of liners is :- (1) The percentage increase in the cost when fitting ordinary dry liners over the ordinary cylinder block is approximately 40%. (2) The reduction in cylinder bore wear which can be anticipated with ordinary liners is very little different from the ordinary cast iron block. Service conditions in our case make it very difficult to establish the effect of fitting modified forms of liner, and I would not anticipate that under the best conditions and in the worst possible service that the phosphor-chrome liner would result in an increase of life very much over 100%, that is, if the ordinary cylinder block or liner was giving .001" per 3,000 miles run, the higher class liner would probably give somewhere about .001" per 6,000/7,000 miles. Comparing these results with those obtained on chromium plated blocks, this has gone up as high as .001" per 50,000 or 60,000 miles. I would suggest that you let us get a little further with the chromium plating job, and then perhaps we could have another discussion on the subject. Regarding the two-leading-shoe system which we have been trying out at Leyland, I would very much like to hear of the other type which you refer to in your letter, and if you could get the patentees in touch with us we would investigate whether the system was definitely superior to the one which we have been trying. We have some knowledge of the two-leading-shoe fitted to the Dennis chassis, but in this case it was leading shoe in the forward direction and two trailing shoes in the reverse direction, which we do not consider is really an all-round proposition. If, as you state, you have a set of the modified two-leading-shoe type on test, then we can await your own | ||