這維基的東西有時候讓人摸不著頭腦。。。

http://en.wikipedia.org/wiki/H_engine -
"An H engine can be viewed as two flat engines, one atop or beside the other. The "two engines" each have their own crankshaft, which are then geared together at one end for power-take-off. "

http://en.wikipedia.org/wiki/Boxer_engine -
"A flat engine is an internal combustion engine with multiple pistons that all move in the horizontal plane. The most popular and significant layout has cylinders arranged in two banks on either side of a single crankshaft, generally known as "boxers". "

所以我的理解是，flat engine 是 H engine 的特例，boxer engine 又是 flat engine 的特例。

所有跟帖： 

• 這麽說來，它說H4也沒有錯。更精確地說應該是B4（大概沒有這個說法吧） -陡然- ♂ (0 bytes) () 08/01/2010 postreply 14:31:25

• No, H engine是2個flat engines。boxer engine是flat engine的主要形式 -330xi- ♀ (462 bytes) () 08/02/2010 postreply 23:08:18