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).
Carburetor float issues during turns in the R. engine and Phantom II.
| Identifier | ExFiles\Box 13\3\ 03-page308 | |
| Date | 17th April 1931 | |
| - 2 - Not quite the same on the R.{Sir Henry Royce} engine because in a machine of this type - the S.6.- flat turns are seldom intentionally made, but in the car the turns are always flat. The main condition where it would occur would be in a side slip - for instance taking off height to land. We are now looking into this question to see what angle of tilt these R.{Sir Henry Royce} carburetters will stand before opening the needle valve. To return to Phantom II., it would appear necessary to have to employ complete circular section floats - as in carbs. in the vee. - to allow full compensation for transference of fuel from one half to the other of the float chambers. As a temporary measure and test we propose lightening the floats as much as possible, and if possible slightly widening them so that there will be less submerging at normal level and so leave greater reserve buoyancy above the fuel level. This will lower the level but we can compensate by shortening the diffusers. This move is only proposed as a temporary measure or test to prove out the point on the road, but we think in the main it is a design problem. We think that we can regard the equivalent of the 30º acceleration as normally frequently encountered on the road and should cater for more than this. If we assumed a maximum coefficient of unity between the tyres and the road when the wheels started to glide on a corner, we should have the equivalent of a 45º tilt. We are now doing a static test on the R.{Sir Henry Royce} carbs. and will report immediately. Hs{Lord Ernest Hives - Chair}/Lov.{Mr Lovesey} | ||