What really makes an internal combustion engine work?

Lets briefly analyze a simple four stroke and two stoke internal combustion engine.

Snow Tank






http://www.frank151.com/blog/2009/11/03/dc_and_ken_block_introduce_the_trax_sti

Almost all modern vehicles like this Subaru STI and Ford Sport-Trac still use four stroke internal  combustion engines.

4x4


http://www.4x4offroads.com/4x4-tindfjallajokull-2007.html