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).
Technical note on increasing the critical speed of a Bensport crankshaft by modifying journal size and bearing shells.
| Identifier | ExFiles\Box 85\5\ scan0038 | |
| Date | 19th June 1933 | |
| X21T. FILES. 19.6.33. BENSPORT CRANKSHAFT. By increasing the journal size from 2.250 to 2.750 we should raise the critical speed 7% and should therefore be able to run up to 4800 instead of 4500. Reducing the thickness of the bearing shells locally, as on the large journal 40/50, to .030 metal the bearing cap studs must be spread .117 a side. There is sufficient metal in the crankcase to do this. The section will however have to be built up to accomodate the larger journals. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||