Quote:
Originally Posted by Garage Dog 65
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that is not a really well engineered package... its nice, but for a lateral-g car that gets beat on and driven... i wouldnt trust a shop that solidmounted the pinion like that.. and relied on the shockmounts for springs and bumpstop...
the corvette spindle isnt designed to carry the weight on the shockmount... and how on earth can you use a solid mount on the pinion of the diff case, when the rest is rubbermounted ??
the ladder connecting the tranny and rear end on a c4 isnt there to impede the exhaust, but to transfer the torque from the pinion...
a quick calculation... engine tq:500, 1.gear ratio:3.07, rear ratio:3.33 => wheeltourque:5111 ft/lbs... distance from pinion support to axle~1foot.. => load on frint x member in first gear 5111 lbs...
with the corvette ladder arrangement the distance is closer to 5 feet, and the resulting load is ~1000 pounds, wich is fine for a double sheer mount 3/8 inch bolt in a rubber bushing...
if the tube is a 40x3mm steeltube the moment of resistance is 1178, and the press is 5111 lbs = 22.7kN assuming the length of the x member is 1m the moment is 11.3kN/m the stress in the tube at that point is 9650n/mm2 = 1400ksi..
this means that the first time you get traction in first .. it will bend as you are far beyond the yield strength of weldable steel
if you were to do the same with a cantilevered spring or airbagged controllarm to cary the load where the spindle/upright is designed to ttansfer load... and some longitudinal controllarm to transfer the torque... youd be fine..
but doing an IRS install requires alittle grey matter activity
(alot of the street rod stuff out there simply isnt safe.. well its fine for a trailerqueen, but much of it is in the words of ralph nader "unsafe at any speed")