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).
Design specifications for the Bensport J.3 engine oil tank.
| Identifier | ExFiles\Box 132\3\ scan0002 | |
| Date | 11th November 1932 | |
| X216. To Dr. From E.{Mr Elliott - Chief Engineer} c.c. Sgr. Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} Da{Bernard Day - Chassis Design}/NV. re Bensport J.3. Confirming conversation re the engine oil tank for the above, we think the amount of oil to be carried should be from 2 to 3 gallons. The air oil ratio in the tank for the avoidance of frothing is considered best in the neighbourhood of 2 to 3, but we cut this down somewhat on the oil tank we made for the 20/25 tank installation, because we were limited for room, and so far as can be remembered the ratio we used was 1 to 3. We think the filler cap should protrude through the apron, and be as near as possible to the centre of the tank. We also think there should be a vent to atmosphere covered by a dome in the apron, and that the said dome, and oil filler cap could be disposed symmetrically on each side of the starting handle shaft. The suction from the tank to the pressure pump on the engine will require a filter for protecting the pump, and this we normally house in a sort of tower on top of the tank, with the filter passing down through the body of the oil. Possibly this tower could be combined with the air vent of the tank in the position already proposed for the last named. The delivery into the tank from the scavenger pump should be arranged to shoot the oil along the roof of the tank through a fishtailed discharge orifice, so as to act as an air separator. The broad stream of emulsion sweeping along the roof, and around the curved corner of the tank, it is found, assist separation materially. We send you herewith a blueprint - Lec.3034 showing the aforementioned tank made for military purposes. We think that a dip stick, combined with the filler cap might be good enough to carry on with on the first tank, for indicating the quantity of oil, and that something more elaborate might be developed later on, for example it is possible now to buy a combined instrument which indicates with the same pointer on two different scales the quantity of petrol | ||