點解汽車死氣喉出氣口多數放在車尾側邊而不是放在正中位置呢?

I believe it's mainly because of the car design

First of all, it really depends on where the engine is located in the car. because it is where the exhaust gas is produced and that's why we need exhaust pipes to direct them out of the car.

The most common design is with the engine in the front. that means the pipe has to go from the front to the end of the chassis (車架底盤). if it is a Forward Engine Rear Wheel Drive car (FR)(後輪驅動), then it is impossible for the exhaust to be in the middle bacause the drive shaft (驅動軸) has to be in the middle connecting the engine gearbox and the rear differentials/wheels. but if it is a forward wheel drive (前輪驅動) then it is possible. for example. the current Mini Cooper have exhaust pipe in the center. However, it does affect the interior / trunk space with this design. so i think most manufacturer design the Forward Engine Forward Drive (FF) car with the pipe on the side for this reason.

On the other hand, if the engine is mounted behind the seats. (Mid-mounted or Rear-Mounted). the constraint is less. This is usually the case for high performance sportscars. examples are Porsche Boxter, Lamborghini Murcielago. However, it is not necessary to design the pipe in the middle. I guess a few constrain like exhaust volume and cooling issue will affect the design.

I think 4 wheel drive cars (4WD) which must have a drive shaft in the middle have similar consideration depending if the engine is forward / rear mounted.

anyway, sorry im not good at typing chinese so it's all English. and the above is only my own understanding. hope it's helpful to ur question.

如果放正中間,個油箱同個士啤軚又要放邊個位?

2008-09-09 08:10:03 補充：
如果部車係後置引制,條死氣喉你可以改到點放都得.如fusca(金龜車)個油缸同士啤軚响前面.

因為可能在其他地方有阻礙