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).
Report investigating a dual-cause fuel flow problem involving an air-lock from test piping and grit contamination.
| Identifier | Morton\M11\ img041 | |
| Date | 25th June 1919 | |
| To EH. from R.{Sir Henry Royce} Copy to GJ. BN.{W.O. Bentley / Mr Barrington} ORIGINAL. RE RUNNING OF 7 CA. R5/G16/6/19 X.682. A mysterious phenomenon has occurred on this car which has been hard to locate, because it was double, viz,- (1) An air-lock due to the use of the piping to the small test tank, the surprise being that although there was enough head to feed this tank from the main tank, there was insufficient head to start the flow to the floatchamber when an attempt was made to run direct after the small tank had emptied itself - [Diagram showing fuel pipe path from a main tank, up and over into a small measuring tank, then down and up again into a float-chamber.] Diagram Labels: HEAD AGAINST FLOW THIS PLUS THIS MAIN TANK SMALL MEASURING TANK. FLOAT-CHAMBER ENDEAVOUR TO AVOID THIS [Stamp: 25 JUN. 1919 RECEIVED] The thick lines shew the double column against the flow, the thin line the part of the pipe with air or vapour in. You will remember that many months ago you got over this by increasing the main tank air pressure to considerably over 2 lbs., which did not shew itself because of a low reading pressure gauge, but was manifest owing to the needle valve being held open (through this pressure acting on the full diameter of its spindle, (since modified) causing flooding. (2) After a petrol failure, and when flow of petrol was again obtained, the rush into the floatchamber stirred up particles of grit, which stopped the low speed jet. (Contd.) [Footer text, very faint: IF B 5327 (200 M.{Mr Moon / Mr Moore}) (R D 408 58-I-IA) R OF S12C/I?] | ||