1.When the scale of sound is desired, they are 4 cycles too.
2.In order to carry out water-cooled machining, there were some conditions.
Water-cooled machining is difficult for 4 cycles on a head like 2 cycle on structure. Although there is also a hand of air cooling, water That is, it is necessary to cool a cylinder.
3.A jacket is required in order to cool a cylinder.
In order to attach the jacket, the round shape of a cylinder case is an
ideal.
4.It lets the crevice between a case and a push rod pass for a jacket.
A to some extent large crevice is required.
5.First stage type FA30 fulfilled these conditions. |
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