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New Edge Cobras
Modular 5.0 stroker kits, any high mileage builds out there?
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<blockquote data-quote="IUP99snake" data-source="post: 13389115" data-attributes="member: 7060"><p>The rod/stroke ratio is important when building a stroker for the reasons you described. </p><p></p><p>I'm not sure if the metric I described is an actual ratio used by engine builders, but I'm pretty sure it's important, not for calculating piston speeds but for determining how much stroke is feasable given the deck height and sleeve length... and the sacrifices in the piston design that must be made in order to keep it from extending past the top or bottom of the bore given the extra travel associated with an increased stroke. </p><p></p><p>For example, the 5.4 has a longer stroke than the 4.6 but the pistons are interchangeable despite the longer stroke in the 5.4 because the length of the liner in the 5.4 is also increased by an equal proportion to the increase in stroke. </p><p></p><p>But if one were to increase the stroke in a 4.6, changes need to be made in the piston design to keep it from protruding from the top or bottom of the cylinder liner. This includes shortening the skirt and moving the wrist pin higher up in the ring lands. </p><p></p><p>Feel free to call me out if I'm not making any sense whatsoever.</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 13389115, member: 7060"] The rod/stroke ratio is important when building a stroker for the reasons you described. I'm not sure if the metric I described is an actual ratio used by engine builders, but I'm pretty sure it's important, not for calculating piston speeds but for determining how much stroke is feasable given the deck height and sleeve length... and the sacrifices in the piston design that must be made in order to keep it from extending past the top or bottom of the bore given the extra travel associated with an increased stroke. For example, the 5.4 has a longer stroke than the 4.6 but the pistons are interchangeable despite the longer stroke in the 5.4 because the length of the liner in the 5.4 is also increased by an equal proportion to the increase in stroke. But if one were to increase the stroke in a 4.6, changes need to be made in the piston design to keep it from protruding from the top or bottom of the cylinder liner. This includes shortening the skirt and moving the wrist pin higher up in the ring lands. Feel free to call me out if I'm not making any sense whatsoever. [/QUOTE]
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Modular 5.0 stroker kits, any high mileage builds out there?
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