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SVT Shelby GT500
Whipple 2.9, pulley broke off from blower... what to do?
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<blockquote data-quote="Silver_Serpent" data-source="post: 13764268" data-attributes="member: 152504"><p>I dont know much about the whipple kits, but I know quite a bit about bolted connections. It appears there are 4 bolt holes right? However, the bolt holes seem to be threaded in the blower snout and the pulley?? Is that right?? There also appears to be two "other" holes, larger holes that are not threaded. Is there any kind of dowel pins that are supposed to go with the kit and be installed in the pulley after the bolts are torqued? </p><p></p><p>I agree with the possiblity of two of the bolts backing out and the other two not being able to support the torque on their own. Bolts in shear, in general, are not very good, which is why I asked if there were dowel pins.</p><p>Also, if there is no dowel pins, then the torque that the bolts were tighted to becomes very important. This is because you are now asking the bolt to do two things, hold the pulley on the snout, and turn the snout. Turning the snout is the part that puts the bolt in shear. If the bolt was torqued fully (80% of yield, TTY, or if it was overtorqued), then the bolt is already so fully stressed, that it doesnt have much left to contribute in the shear direction. Sooo ... maybe they were overtightened and/or the dowel pins are missing?</p></blockquote><p></p>
[QUOTE="Silver_Serpent, post: 13764268, member: 152504"] I dont know much about the whipple kits, but I know quite a bit about bolted connections. It appears there are 4 bolt holes right? However, the bolt holes seem to be threaded in the blower snout and the pulley?? Is that right?? There also appears to be two "other" holes, larger holes that are not threaded. Is there any kind of dowel pins that are supposed to go with the kit and be installed in the pulley after the bolts are torqued? I agree with the possiblity of two of the bolts backing out and the other two not being able to support the torque on their own. Bolts in shear, in general, are not very good, which is why I asked if there were dowel pins. Also, if there is no dowel pins, then the torque that the bolts were tighted to becomes very important. This is because you are now asking the bolt to do two things, hold the pulley on the snout, and turn the snout. Turning the snout is the part that puts the bolt in shear. If the bolt was torqued fully (80% of yield, TTY, or if it was overtorqued), then the bolt is already so fully stressed, that it doesnt have much left to contribute in the shear direction. Sooo ... maybe they were overtightened and/or the dowel pins are missing? [/QUOTE]
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SVT Shelby GT500
Whipple 2.9, pulley broke off from blower... what to do?
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