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Discussion Starter · #1 ·
Been reading about the stroker kit ACD has for the 4bt. Unless I am missing something, it appears the parts for it is just very nice looking H-beam rods and pistons. Have seen nothing about an actual stroker crank used. If I haven't missed something about a crank, how do you increase the stroke of a motor using the same crank?

Diesel World's article states factory is "4.02-inch bore with a 4.72-inch stroke" but, just by changing the pistons and rods change it to "4.402-inch and a much longer 5.430-inch stroke" without crank change. So where does the additional 0.71" of stroke come from if crank swing stays the same?

I realize that the wrist pin is moved closer to the crown of the piston, and it appears to be a change in the center to center on the rod. Which is normal for stroker motors, but it is usually required due to the increase in swing on the crank.
 

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It's been discussed on here before and the concensus wasn't positive.

You are correct that you can't increase stroke without changing our highly modifying the crank.
 
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