Wardhana, Masruri, Ilminnafik, Nasrul, AND Sumarji, Sumarji. " Pengaruh Panjang Pipa Katalis Annulus Konsentris Pada HCS (Hydrocarbon Cracking System) Terhadap Torsi Motor Bakar 4-Langkah" STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin [Online], Volume 1 Number 1 (1 January 2018)