Fuel inlet for IC engine - has variable inlet valve timing and two step opening of valve

摘要

The I.C. engine operates on a four stroke cycle and has a modified inlet valve. The timing of the inlet valve is advanced relative to bottom dead centre or may be retarded to an amount greater than 50 degrees of rotation of the crank. The variation in valve timing may be maintained to increase the angle of retard to 90 degrees. The inlet valve opening pattern is such that the valve opens in two steps. The valve first opens before the piston reaches top dead centre and opens further after the piston reaches bottom dead centre.