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 performance comparison of 'Pynol' fuel against standard petrol.
| Identifier | ExFiles\Box 32\1\ Scan081 | |
| Date | 15th May 1923 guessed | |
| contd:- -2- float mechanism) and also owing to the viscosity being higher, the mixture with Pynol was actually weaker than with petrol. On the road we could not get as good acceleration or hill climbing with the same carburetter setting as with petrol. The bench tests show that at full throttle with the same engine speed and the same carburetter setting, less Pynol was used than petrol, but it was necessary to make the setting stronger for "Pynol" in order to obtain maximum power; when this was done the consumption was practically the same as with petrol except at the lower speeds the distribution became worse with "Pynol". Detonation is reduced when using Pynol compared with ordinary petrol, but it is not as good as benzol in this respect. The smell from the exhaust is slightly worse than with petrol. The spirit has a distinct pale yellow colour. From the short tests we have made, we could not recommend "Pynol" for use on R-R cars where the engines are expected to work perfectly over a very wide range of speed and throttle. We think, however, as far as our experience goes, it should give better results than the usual low grade petrol. To enable us to confirm and check the results and be certain that we are getting the best results from "Pynol", we should require a further 50 gallons of this fuel. Hs.{Lord Ernest Hives - Chair} | ||