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).
Tests on an oil relay ignition governor for an EAC engine.
Identifier | ExFiles\Box 65\1\ scan0052 | |
Date | 2nd January 1925 | |
X. 3685 To Hs.{Lord Ernest Hives - Chair} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rnl/LG2.1.25. OIL RELAY IGNITION GOVERNOR. We have carried out further tests to determine the limits of ignition advance between which an EAC. engine with a 4 to 1 compression ratio will maintain its full power. We find that the average of our results differ somewhat from those figures previously given. We also find however that we can alter our ignition setting to a very wide degree before we lose 5% in power either advanced or retarded. We have obtained an advance curve with the oil relay which closely follows the specified curve. We have plotted this with the new advance figures. We consider that we shall not lose 1% of power at any point with this curve. We have also illustrated the effect of reduced oil pressure and increase oil temperature on the governor when fitted with a piston .007" clearance. This appears to be about the limit to which we can go from the point of view of maintaining governor efficiency under these extreme conditions. We are measuring the amount of oil which passes the small piston with this clearance under normal running conditions. We consider this is likely to prove a reasonably small quantity. The EAC. oil pump appears to be capable of circulating a very large quantity of oil. It therefore seems improbable that the small escape through the oil relay will have any material affect upon the oil pressure. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||