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).
Components and methods for a carburetter flow bench, specifically concerning fuel and air flow measurement.
| Identifier | ExFiles\Box 122\4\ scan0171 | |
| Date | 30th June 1938 | |
| 1036. To Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}8/JH.30.6.38. CARBURETTER FLOW BENCH. (a) Enumeration of individual items and reasons for their choice. (b) Notes on the uses to which the flow bench may be put. (c) Cost of outstanding items bought outside. ................ (a) FUEL FLOW. For the measurement of fuel flow the choice lies between flowmeters and the timing method with graduated bottles or pipettes. If flowmeters are to be used it is essential that they be very accurate. Vauxhall's are adamant in their view that the Commercial Engineering Laboratories Flowmeter which they use is essential. It is significant that Zeniths representative working in cooperation with Vauxhall's is also of the opinion that this is the only flowmeter worthy of consideration. The method using pipettes is more laborious and not completely without possibility of error, since at the commencement of the timing float chamber level may be high or low. In view of the relatively fractional cost of the latter method and since results obtained by Zenith's using their method do tally with those obtained by Vauxhall's, one cannot see justification for an expenditure of at least £120 on flowmeters. AIR FLOW. Choice here lies between the use of venturi orifices and sharp edge orifices. Vauxhall's use venturi orifices obtained from America and calibrated against those of the Chevrolet Company. Nobody has given a satisfactory reason why sharp edge orifices should not be used, although it appears they are not Cont'd.{John DeLooze - Company Secretary} | ||