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).
Notes on carburation, engine temperature, and the use of benzol/petrol mixtures to improve performance.
| Identifier | ExFiles\Box 1\2\ B001_X 53-page07 | |
| Date | 13th March 1919 | |
| 13.3.19. NOTES ON CARBURATION AND THE USE OF BENZOL AND MIXTURES OF BENZOL AND PETROL ON R.R. CHASSIS. To obtain the best results and the most economical running on the R.R. chassis it is essential that the temperature of the water circulation should be kept high. We recommend it should be from 75°C to 85°C. This is more essential than ever at the present time because of the inferior quality of petrol which is on the market. To maintain the water at the proper temperature it is necessary, during cold weather, to blank off a portion of the radiator. Messrs. Rolls-Royce will supply Customers with the necessary plates and bolts for carrying this out. It has been found that when the atmospheric temperature is anything under 8°C, that about one-third of the radiator can be blanked off. This portion of the radiator should remain blanked off until owing to the warmer atmospheric temperature, the water boils. It will possibly be noticed that when the water temperature is kept high that the tendency of the engine for detonations or pinking is increaseds. To overcome this we recommend the use of a percentage of benzol mixed with the petrol. The advantages in the use of benzol over petrol are:- 1. Increased M.P.G. It is possible to obtain 10 to 15% better consumption with benzol than with petrol. 2. Absence of detonations or pinking. This makes it unnecessary to remove the cylinder to clean out the carbon. The disadvantages in using all benzol are:- 1. Offensive smell from the exhaust. Contd. | ||