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).
Comparison of the R.R. and Luvax pumps, detailing pressure tests, design differences, and dismantling instructions.
| Identifier | ExFiles\Box 141\2\ scan0059 | |
| Date | 21th December 1933 | |
| -2- Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}1/KW21.12.33. Using a leak of a No. 2 Bijur, the pressures are :- R.R. 74 lbs.sq.in. At start of stroke. 70 " " " Luvax. 105 lbs.sq.in. 90 " " " The advantage of the Luvax Pump is its simplicity in design and ease of accessibility. There is one leather cup in place of two on the R.R. The plunger, spindle and spring are assembled in one unit, and can either be withdrawn or re-fitted without any effort, from the oil chamber. The large ball valve and seating are accessible for cleaning. With the R.R. Pump it is necessary to have a special tool to dismantle the pump. The plunger and the spring are loose and controlled by the oil chamber cover. If re-erecting the Pump after one of the leather cups invariably becomes damaged, as its leading edge has to be guided into the bore while it is being assembled, and is in a very inaccessible position, there is difficulty in assembling the oil chamber. The four flexible 2-B-A studs are difficult to align with the corresponding holes in the cover. A filter is provided on the R.R. Pump, whereas on the Luvax no filter is fitted. We are of the opinion that the filter is not necessary, as all the Bijurs have filters embodied in them and where there is no Bijur unit a special filter is fitted, such as the one on the front axle. The following are the operations necessary to dismantle the two pumps :- LUVAX PUMP. To dismantle, remove pedal cover and pedal by taking out ¼" bolt and external return spring. Then remove from pump spindle contact piece for pedal jaw. Invert pump and remove bottom cap - the valve chamber and pump spindle will then come away complete. The bottom valve seat is screwed on to the top seat which is fixed to the spindle which carries the spring. The ball valve and both seatings are visible through the holes drilled for the passage of the oil, and also can be cleaned without dismantling. | ||