Originally Posted by teammpp
Think of the area the piston moves in as a box. Now if the pin is set on the crankshaft in such a way that the piston moves the same distance as its diameter this is the box.
Now, if you move the pin closer to the centerline of the crankshaft from this position for the box the piston moves up and down a shorter distance than its diameter and is referred to as a shortstroke. The opposite referring to a longstroke.
ok, i measured the distance between the crank pin and the center of the crank on cranks from a MT12 and a MR12, they are the same. so what makes the MT12 a long stroke and the MR12 a short stroke ?