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).
Oil pipe leak, back-pressure from banjo junctions, and oil lubrication in different temperatures.
| Identifier | ExFiles\Box 27\1\ Scan118 | |
| Date | 8th March 1929 guessed | |
| - 5 - (10) We find that if the oil pipe is entirely disconnected from the right rear shock absorber (farthest point from tank) the plunger which fell before in 54 secs, now falls in 15 secs. The rate of fall of the plunger will therefore show up a serious leak. It appears to me that the use of banjo junction connections must put a lot of back-pressure on the system which we escape with the standard Bijur junctions. They must also interfere with the even distribution of pressure throughout the system. As explained in earlier note we use smaller drip plugs in the warmer locations. In very cold weather remote and cold parts like the front axle probably do not get their fair share of oil even with Mobiloil A, but they probably do not lose their oil so fast. At least they show no sign of not getting enough. The fact that we use gravity feed to the cross tube balls front side steering ball etc. makes it necessary to use an oil which is not absolutely solid at zero fahrenheit. I hope the above information will be useful. Yours faithfully, ROLLS ROYCE OF AMERICA, INC. Maurice Olley Encl. | ||