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 determining the efficiency of ignition controls and the associated oil relay.
| Identifier | ExFiles\Box 66a\4\ scan0112 | |
| Date | 16th February 1926 | |
| Expl: Report: [Redacted] Expl: No: x8240 Ref: Eg/Rm{William Robotham - Chief Engineer}2/LG16.2.26. IGNITION OIL RELAY. x8240 x8685 Efficiency of Ignition Controls. We have carried out tests to determine the over all efficiency of the controls under the loads normally dealt with. We find that in the case of a good set of controls 1 lb. to 1 1/4 lbs. push is required from the relay piston to move the controls when the magneto and distributor are disconnected. That is, the static friction of the pins and joints is equivalent to this amount. With the magneto only coupled up, the efficiency between the piston and the magneto ball end varies between 80 and 60% according to the load dealt with. That is, a 12 lbs. push from the relay piston only exerts a 2 lbs. push at the magneto ball end instead of 3.6 lbs. The controls to the distributor have an efficiency of 42 - 45% only. In the case of the magneto, the efficiency increases slightly with the load up to the limits allowed. We find that the force required to advance the distributor varies more than we anticipated, and in consequence are putting a production limit on this item. We have been making a number of tests to ascertain what alteration is necessary to the oil relay in order to enable this device to function with an oil pressure of 15 lbs/sq.in. We know that with the present relay we have very little to spare with the oil pressure at 25 lbs/sq... | ||