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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
Any driveshaft review?
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<blockquote data-quote="seank" data-source="post: 11786724" data-attributes="member: 137223"><p>So is there a perceivable difference after installing, similar feel to say a lightweight flywheel? With some basic napkin calcs and some gross assumptions I get around a 57% reduction in rotational inertia between stock and a 20 lb unit.</p><p> </p><p>I=0.5*(m)*(ri^2 + ro^2) = Moment of inertia of a cylinder with wall thickness</p><p> </p><p>Where:</p><p>m = mass of shaft = 47 lb stock = 20 lb aftermarket</p><p>ri = shaft inside radius = 1.5in = 0.1250ft assumed same for stock and aftermarket</p><p>ro = shaft outside radius = 1.75in = 0.1458ft for aftermarket I assumed same for stock</p><p> </p><p>I(stock)= 0.866 lbft^2</p><p>I(Alum) = 0.369 lbft^2</p><p> </p><p>.369/.866 = 0.426 or a 57.4% reduction</p><p> </p><p>Assumptions that are probably wrong:</p><p> </p><p>Stock diameter = Alum diameter</p><p>Stock wall thickness = Alum wall thickness</p><p>Not sure on driveshaft wall thickness is a 0.25" realistic?</p><p> </p><p>:shrug:</p></blockquote><p></p>
[QUOTE="seank, post: 11786724, member: 137223"] So is there a perceivable difference after installing, similar feel to say a lightweight flywheel? With some basic napkin calcs and some gross assumptions I get around a 57% reduction in rotational inertia between stock and a 20 lb unit. I=0.5*(m)*(ri^2 + ro^2) = Moment of inertia of a cylinder with wall thickness Where: m = mass of shaft = 47 lb stock = 20 lb aftermarket ri = shaft inside radius = 1.5in = 0.1250ft assumed same for stock and aftermarket ro = shaft outside radius = 1.75in = 0.1458ft for aftermarket I assumed same for stock I(stock)= 0.866 lbft^2 I(Alum) = 0.369 lbft^2 .369/.866 = 0.426 or a 57.4% reduction Assumptions that are probably wrong: Stock diameter = Alum diameter Stock wall thickness = Alum wall thickness Not sure on driveshaft wall thickness is a 0.25" realistic? :shrug: [/QUOTE]
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Any driveshaft review?
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