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 overheating of Bentley brake drums and a proposed modification to increase the front drum rib diameter.
| Identifier | ExFiles\Box 85\1\ scan0042 | |
| Date | 10th March 1936 | |
| XW.6 To By.{R.W. Bailey - Chief Engineer} c. to By/TWD.{T. W. D???Aeith} Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}10/KW.10.3.36. Bentley Brake Drums. Now that the 4 1/4 litre engine is on production, we are faced with the problem of brake drums getting too hot. This is especially important on the front. We are able to keep drums cooler if the ribs are higher. We have found out that we can increase the diameter of the front drums' ribs by .150" using the existing castings. We are going to run a 10,000 miles test with drums so machined. Will you help us to get this alteration made by holding up the machining of such castings as will not be required on cars during the next two months ? Sg.{Arthur F. Sidgreaves - MD} is anxious for some improvement to be made in this respect. Hs{Lord Ernest Hives - Chair}/A.F.Martindale. | ||