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).
Engine 'opening up' tests, discussing oil pressure, temperature, and carburettor performance with suggestions for modifications.
Identifier | ExFiles\Box 179\3\ img068 | |
Date | 24th October 1933 | |
-2- This drop may be due to the sluggishness of the oil in the pipe lines causing the pump to be partially starved and where the tank is below the level the drop in pressure is more pronounced owing to the oil having to be lifted. OPENING UP TESTS ON 'H2'. At present the ruling is that no engine is to be opened up until the oil temp reaches 20°C and the usual method adopted in warming up is viz. Run 2 mins at 600 R.P.M. " 5 " at 800 R.P.M. Continue to run at 1000 R.P.M. until inlet oil temp reaches 20°C and 60°C water outlet temp are reached. The method adopted during the quick opening up tests was to run the engine at 600 R.P.M. until the oil pressure was 30 lbs/sq.in. then run at 1000 R.P.M. until pressure reached its max then opened up to full throttle regardless of water or oil temperature. The whole operation occupying approx 40 secs from the time of starting up. The scavenge pump starts returning at the tank in 10 secs of starting up. The water temp reached boiling in 3 mins. CARBURATION. The new carburettors functioned very well and the acceleration was good with low water temperature. The propeller used was a Fairey Reed type which gave 2100 R.P.M. at Full Throttle and the full revs were given when the throttle was opened and very little change was noticed when the engine got really hot. CONCLUSION. The foregoing tests are of a preliminary nature and were carried out, in conjunction with our other work on the car in the Vee engine. We hope to have a R/C engine on test within the next few days which will be coupled and will approximate the actual machine conditions. The tests however have served to show that the engines can be opened up quickly without detriment. With precautionary modifications to the oil system such as larger oil pipe to reduce the cold oil drag and extra oil to the cyls we cannot foresee any reason why the engine will not be just as reliable opened up quickly as | ||