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).
The effects of using benzol and petrol fuel mixtures.
| Identifier | ExFiles\Box 1\2\ B001_X 53-page08 | |
| Date | 13th March 1919 | |
| Contd. -2- 13.3.19. 2. Possibilities of it freezing. 3. A "Tarry" deposit is formed in the carburetter and on the inlet valve guides which eventually is likely to give trouble. 4. If spilt on the paint work on a part where it cannot easily evaporate, it will destroy the varnish and the paint. It has been found that if a mixture of benzol and petrol is used, the advantages there are in using all benzol can be still be retained but the disadvantages which exist when using all benzol are either eliminated or very considerably reduced. Benzol mixed with petrol always remains in solution, there is no fear of them separating. We recommend a mixture of benzol and petrol between 20 to 50%. The results which can be expected from the various mixtures are as follows:- 20% Benzol 80% Petrol. (or 1 tin of Benzol to 4 tins of petrol) It is very difficult to distinguish any smell of benzol in the exhaust. The petrol consumption will be improved slightly - 2 or 3%. Detonations or pinking will be greatly reduced but may not be entirely eliminated according to the amount of carbon in the cylinder. The effect of this mixture on the paint work is no different to ordinary petrol. There is no need to make any alterations to the carburetter adjustment or to the level in the float chamber. Starting and slow running will be the same as with petrol. 25% Benzol 75% Petrol (or 1 can of benzol to 3 cans of petrol). The advantage of this mixture over the 20% mixture is that it will more completely prevent detonations. For this mixture there is no need to alter the carburetter adjustment | ||