Carbureter Design for the C. F. R. Detonation Engine

ACCURACY of metering and speed in manipulation are the two prime requisites in a carbureter for detonation-measurement work, according to the author, who outlines briefly the development, for use with the Cooperative Fuel-Research Committee test engine, of an instrument based upon the Dobbs carbureter designed by the Anglo-Persian Oil Co. for detonation testing.

As now manufactured for routine testing, the device consists of four float-bowls having entirely seperate air and fuel channels, the channels from each bowl being controlled by individual air and fuel valves that operate in unison. The throttle, which is of the barrel type, is operated by a worm and gear and has an indicator arm attached to facilitate duplication of throttle settings. Results of tests indicate that this carbureter is satisfactory over a range from 40 deg. fahr. to the point at which gassing of the fuel becomes objectionable. Special nozzles can be provided for fuel densities outside the normal range.