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{{Expert-subject|Technology|date=February 2009}}
'''Two-and-four stroke engines''' are [[engines]] that combine elements from both [[Two-stroke engine|two-stroke]] and [[Four-stroke engine|four-stroke]] engines. They usually incorporate two [[piston|pistons]].
==M4+2 engine==
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There is a possibility of changing the relative [[piston]] positions during the engine work, that gives the possibility of changing the compression [[ratio]] depending on the temporary level of the load. This suggests the possibility of different [[fuel]]s combustion (low octane petrol, bio-fuels with high levels of vegetable components).
The working cycle is characterised by an almost
The engine is characterized by:
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