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).
Issues with overoiling, cylinder lubrication, and piston rings in an engine.
| Identifier | ExFiles\Box 178\1\ img141 | |
| Date | 19th May 1926 | |
| - 8 - Hs{Lord Ernest Hives - Chair}/ACL/T19.5.26. with very low oil pressures and large clearances it is left open to chance that some parts will take the greater part of the oil while others tend to starve. CYLINDER LUBRICATION. This is effected by the oil that leaks from the bearings and is thrown off on to the cylinder walls by the rotating crankshaft. The main difficulty experienced is in preventing the passage of oil into the combustion space where it is burnt, causes smoky exhaust and heavy carbon deposit. OVEROILING TROUBLES AND FACTORS CONTROLLING SAME. Overoiling troubles usually become manifest in the following ways:- 1. Excessive Oil Consumption and/or 2. Smoky Exhaust when running light. The following notes shew the influence exerted by the various parts on the passage of oil into the combustion space. PISTON RINGS. In order to reduce the oil pumping as much as possible, it is important that the rings exert the full specified radial pressure against the cylinder walls - in our case about 4.8 to 7 lbs./sq ", - and are in contact over their whole circumference. It is equally as important that the rings are a very good fit in contd. | ||