yes, carburetor is necessary for petrol engine. because it give homogeneous mixture of fuel and air. if we used injector in s.i. engine then fuel is not burn properly due...

if be use lithime at exhaust then lithime reacted with co2 & form carbon and lio2

if we used turbocharger then it is possible to use low quality fuel like kirosin but the life offule injector is less

for magnification of power of ic engine we do some modefication. like 1.) using carbon fiber 2.) using supercharger or turbocharger

magnet dont work at Queri temp. or above so we not improve power in ic engine with help of magnet.