Abstract: The present invention relates to an accumulator fuel injector for a diesel engine, the device including first and second accumulators which are connected through a check valve and a relief valve. Fuel pressurized and delivered by a fuel injection pump is charged into the first accumulator so as to increase its pressure abruptly. When the fuel pressure in the first accumulator reaches a selected relief pressure, the fuel is charged into the second accumulator through the check valve and is accumulated therein. When fuel injection is started by opening of an injection valve, the fuel accumulated in the first accumulator is injected through the injection valve and at the same time the fuel accumulated in the second accumulator flows out to the first accumulator through the relief valve so as to also be injected through the injection valve.

Abstract: The present invention relates to an intake system with double intake ports for internal combustion engine, involving two intake ports for each cylinder chamber of the engine, one of the two intake ports being a pure helical port which introduces suction air with helical flow, but without straightway flow, into the cylinder chamber, and another intake port being partially helical port which introduces suction air with helical flow and straightway flow into the cylinder chamber, the outlets of the two intake ports being preferably located in nearer side of the center of the cylinder chamber, and side by side in a parallel direction with the axis of cam shaft; and preferably the pure helical intake port being suspended in lower speed range by pausing device having pause valve which is preferably consisted of suction valve; and the length of suction passage being preferably varied in accordance with the variation of speed ranges.