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Banyak yang ngira makin gede lubang porting, makin gede juga tenaga yang dihasilin. Secara data, ini belum tentu bener. Lubang porting yang terlalu gede justru bakal ngerusak flow udara, efeknya tekanan bakal ilang yang buat ngisi ruang bakar, apalagi pas putaran bawah. Terus efeknya Torsi mesin bakal anjlok atau 'ngempos' karena udara kehilangan momentum buat masuk ke head . Porting bukan sekedar 'ngerok' dinding silinder head sampe tipis. Porting itu seni ngebentuk ulang saluran buat ngilangi...
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