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).
Analysis of body shims, oil cooler performance, and oil degradation in competitor vehicles.
| Identifier | ExFiles\Box 173\4\ img209 | |
| Date | 3rd January 1936 guessed | |
| -2- What appears to me to be the most important is the fact that they are sure the solution lies in the amount and position of the slack and not in some mysterious feature. We have not yet found a Buick which chunked. I have found that the body shims of rubber fabric are not always from .125 to .200 thick. Cadillacs are more like .375 and Buicks .500, Packards and Lincolns however were thinner. Buicks abandoned the oil cooler because it choked with ordinary oils, at 30,000 miles and therefore required cleaning every 20,000. With the cooler they kept a temperature of 225° which rose to 250° as the cooler choked. Without the cooler they say they reach a max. of 260°. They run the oil through the centre of the rocker shaft to warm the valve mechanism and cool the oil. We have a sample rocker shaft. Oils which have been treated so as not to form sludge when they reach about 260° form a hard varnish which is worse as it sticks the parts together and will destroy the bearings. a.{Mr Adams} | ||