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).
Secret memo discussing design changes to the petrol tank and fittings for cars with 4-wheel brakes, including the adoption of a vacuum system.
| Identifier | ExFiles\Box 182\M20\M20.1\ img054 | |
| Date | 27th June 1924 | |
| 3 2 GALL RESERVE? ORIGINAL TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} SECRET. R6/M27.6.24. Copy to CJ. BJ. " WOR.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} " DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} " BY.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} " EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. 11. PETROL TANK ETC. X8460 V3575 /8400 A complete drawing has been made of various fittings round the petrol tank, including the tank protecting luggage grid. It is intended in this model with future EACs. to make this luggage carrier part and parcel of the chassis since we are now using it as a standard petrol tank guard for these cars with 4 wheel brakes. It will be noticed that with all cars with 4 wheel brakes we must as soon as ever possible, for the obvious reason of a rear puncture, adopt the vacuum system, and with a vacuum system we can use the RR. petrol level indicator (which is not magnetic) and has not the defect of the magnetic guage. It will be noticed that with vacuum feed it is much easier to ventilate the tank while filling, and perhaps the function of the special pipe provided for this ventilation can be embodied in some other pipes. It is intended also that with the vacuum feed we shall be able to fit a partition in the tank so as to embody a 2 gal. reserve. The possibility of a slight leak in the changeover cock seems of much less importance than with the pressure system, there being ample capacity in the suction of the engine to provide for any leakage that might naturally occur in a changeover cock. It will be noticed that the problems about the tank have therefore materially changed. R.{Sir Henry Royce} | ||