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).
Issues with petrol tanks with side fillers, focusing on venting problems and cap design.
| Identifier | ExFiles\Box 42\4\ Scan084 | |
| Date | 20th July 1920 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Bn.{W.O. Bentley / Mr Barrington} c. to Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} X3889 Hs{Lord Ernest Hives - Chair}4/LG20.7.20. 3889. X.3755. PETROL TANK WITH SIDE FILLER. X.3764. X.3923. We have fitted 6.EX and 4.EX with the petrol tanks which have the side filler. We found that we had trouble on both these cars due to the fact that petrol would not run into the tank quickly enough; it would not run in as quickly as a two-gallon tin of petrol could be emptied. We have proved that this is entirely due to the want of vent. If we have sufficient vent it is possible to empty three two-gallon tins at a time into the side filler without it over-flowing. We find that it is necessary to have a vent .2" dia. the whole way to make it so that we can pour petrol in freely without risk of it becoming air-locked. We have also had difficulty in maintaining the air pressure due to the joint with the cap on the side filler. We found the only way we could make this joint tight was to use a soft washer in place of the red fibre. Another point which needs modifications is the features on the cap - they are not pronounced enough to enable it to be turned by hand easily. We have also had difficulty in making a petrol tight joint at the cap which forms the end of the side filler. This is rather a large diameter joint to make petrol-tight. Contd. | ||