i am still scratching my head over what is just read....

internal combustion engine... is just combustion, not explosion. Otherwise it would be called internal explosion engine.

explosion
[ik-sploh-zhuh n]

noun
1.
an act or instance of exploding; a violent expansion or bursting with noise, as of gunpowder or a boiler (opposed to implosion ).
2.
the noise itself:
The loud explosion woke them.
3.
a violent outburst, as of laughter or anger.
4.
a sudden, rapid, or great increase:
a population explosion.
5.
the burning of the mixture of fuel and air in an internal-combustion engine.
6.
Phonetics, plosion.

yeah.. you're so right..


in the old days, they don't catch fire...that, or this is actually not made by japanese...