Vostok Engineering
The stroke is twice the distance between the main journal and the rod journal (blue-yellow to blue-black circle called the crank throw) and is constant at 89.6mm for our M54B30 engine. The rod length is also constant and is 135mm. Let''s call the height of the piston at the bottom (bottom dead center, BDC) our reference height and say it is 0mm.
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