為何回壓不足會流失低速扭力?
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大家都知道拆觸媒、改直通，改到後來如果回壓不足的話、 <br>低速扭力將會流失，以裝代觸媒為例， <br>3000 轉以上真的是虎虎生風，但是在 2500 轉以前，底速扭力 <br>就是比原來差了一點。<br><br>到底回壓是指哪裡的壓力呢？為何改直通後壓力就會降低呢？ <br>更奇怪的是，引擎吸入一樣的多的空氣，注入一樣多的汽油， <br>點火時間也沒變，為何輸出的扭力會降低？到底什麼改變了？ <br><br>Thanks.
#2
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HELLO!!!理查哥哥
錯了不要打我丫
回壓,就是排氣的回壓,排氣經過迂迴曲折的排氣就會有回壓,直通的回壓應該是比較低的
還有,這個我是估的~
回壓不足,在動力行程後排氣間就會開了,但排氣回壓不足,會使到火焰到排氣管處走,所以壓力減低
錯了不要打我丫
回壓,就是排氣的回壓,排氣經過迂迴曲折的排氣就會有回壓,直通的回壓應該是比較低的
還有,這個我是估的~
回壓不足,在動力行程後排氣間就會開了,但排氣回壓不足,會使到火焰到排氣管處走,所以壓力減低
#3
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LJS bro and tri bro, pls correct me if i'm wrong! tis is my 1st time answering other ppl's question, hehe. ^_^
in exhaust phase, the piston pushes the air in the "cylinder" out but there will still be exhaust air left in the "combustion chamber". because air has mass, there are 2 ways for this leftover air to exit. one is the exhaust air in the combustion chamber needs to be dragged out by the inertial effect of the exhaust air in the cylinder. two is tat it can be pushed out by the intake air. if back pressure decrease, the inertial effect of exhaust air decrease, so it is difficult for the air to exit the combustion chamber. and at low rpm, the intake air is not fast flowing, so it doesnt have a big "pushing" effect towards the leftover gas.
tri bro and LJS bro, am i correct ma? (very nervous, ccc)
in exhaust phase, the piston pushes the air in the "cylinder" out but there will still be exhaust air left in the "combustion chamber". because air has mass, there are 2 ways for this leftover air to exit. one is the exhaust air in the combustion chamber needs to be dragged out by the inertial effect of the exhaust air in the cylinder. two is tat it can be pushed out by the intake air. if back pressure decrease, the inertial effect of exhaust air decrease, so it is difficult for the air to exit the combustion chamber. and at low rpm, the intake air is not fast flowing, so it doesnt have a big "pushing" effect towards the leftover gas.
tri bro and LJS bro, am i correct ma? (very nervous, ccc)
