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Originally Posted by lantsalot
So would this imply that (all other engine attributes staying the same) a longer rod would give you a shorter stroke, and thus less TQ?
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Mounting position of the rod inside the piston is also related. A longer rod which is closer to the surface of the piston can give the same stroke as a shorter rod mounted further from the piston surface with nothing else changed.
This is all talking Honda engines, but it's still relevant to your question:
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A longer rod makes more torque with the same piston force, and since it's less angular than a shorter rod, reduces sidewall loading and decreases friction. All of this adds up to more power.
Longer rods also give the pistons more "dwell," the brief periods of time the piston is at top dead center and bottom dead center. A longer dwell allows for better flow of intake and exhaust gases since the piston moves slower between up- and downstrokes.
Read more: http://www.hondatuningmagazine.com/t...d_stroke_ratio
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