Emashumini eminyaka amuva nje, izitayela zezimoto nezinye izimboni ziye zanda isidingo sezinto ezintsha zikazibuthe.Ngenxa yalokho, maphakathi nawo-1990 izingxenye zokuqala ezenziweinhlanganisela kazibuthe ethambilebazalwa.Futhi umkhuba wokusebenzisa lezi zinhlanganisela ezithambile zikazibuthe (SMCs) uyaqhubeka nokukhula.

Lezo zingxenye zokuqala ze-SMC bekungama-ignition cores, asetshenziswa kakhulu ezimotweni eziningi ze-GM.Zazihlangene ziyindilinga, futhi akukho tape yokuvikela eyayisetshenziselwa ukuvikela ukugoqa okuyinhloko kukhoyili.Ngokushesha phambili kuze kube namuhla, futhi ubuchwepheshe be-powder metal -- kanye ne-SMC -- sebuhambe ibanga elide.Qhubeka ufunda ukuze ufunde izisekelo zezinhlanganisela ezithambile zikazibuthe nokuthi yini ezenza zibaluleke kakhulu ezingxenyeni zikazibuthe ezimbonini eziningi.