Further Investigation of Fuel Injection in an Engine Having Spark Ignition

THIS INVESTIGATION of fuel injection with spark ignition is a continuation of work previously reported,3 which was carried on in the aeronautic-engine laboratory of the Massachusetts Institute of Technology. Although a four-cycle engine was used, the fuel was injected during the compression stroke so that the results might be applicable to the two-stroke cycle without possibility of loss of fuel through the exhaust.

Among the effects studied were those of stratification and of late injection or late ignition as a means of controlling detonation with high compression. Fuels used were aviation gasoline, ordinary Diesel fuel and hydrogenated fuel oil, the last seeming to offer interesting possibilities. Directed turbulence was found to be essential for good distribution of the fuel in the cylinder and satisfactory operation of the engine.

Discussers questioned as to lubrication difficulties in the injection pump and valve and the engine cylinder, the possible availability of hydrogenated fuel oil and the theory of combustion under the test conditions. A contribution was made as to the action and effect of turbulence.