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).
Big end bearing performance, a new crankshaft design for Bentley models, and balance weight adjustments.
| Identifier | ExFiles\Box 3\6\ 06-page275 | |
| Date | 24th October 1934 | |
| -2- Rs{Sir Henry Royce's Secretary}/Ra.1/Kn.{D. G. McKechnie - Sales}24.10.34. The big end bearings demonstrated what we have previously thought, that as long as they do not break up due to overheating, as they have done on recent 10,000 miles tests, they will not wear at anything approaching the rate of the main bearings. This gives us a certain amount of confidence with the narrow pin bearings on the new crankshaft which we are experimenting with for the next series Bentleys. This narrow pin crank should also decrease main bearing wear as it puts up the value of the balance weights from 62 to 74% and lowers the out of balance per crank from 9.08 to 7.68 lbs/ins. EM/Ra. | ||