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).
Endurance test report on carburettor freezing issues leading to increased petrol consumption.
| Identifier | ExFiles\Box 42\3\ Scan088 | |
| Date | 14th February 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} H.{Arthur M. Hanbury - Head Complaints} c. to BY.{R.W. Bailey - Chief Engineer} X3841 Hs{Lord Ernest Hives - Chair}/ACL1/LG14.2.27. RR. F.10. CARBURETTERS. X933 X2510 During an endurance test on the hangar with the airscrew, trouble was experienced through the carburetters freezing. The air temperature at the time was very low, in fact freezing outside the test shed. The trouble became manifest by a steady increase of petrol consumption occurring about 10 mins. after the engine had been opened up to full power. The consumption was observed to increase by about 20% and remain constant at this figure. The general running of the engine seemed unaffected except for the drop in the revs. per minute of 150. If the engine were throttled down to an idling speed for about a minute and opened up again, the consumption became normal but commenced richening again as before. The mixture control was in the full strong position throughout these tests. Suspecting freezing at the diffuser we made a rough test by directing the flame from a blow-lamp over the air intake. The consumption then rapidly fell to the normal value. Snow and ice obstructing the air holes at the base of the diffuser tube - or in fact any of the bleed holes in the emulsion tube - would be expected to increase the consumption as we have observed during these tests and although we could not actually see if this was taking place, the experimental contd :- | ||