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SVT Shelby GT500
Another crank bolt question
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<blockquote data-quote="Catmonkey" data-source="post: 16487950" data-attributes="member: 124025"><p>I'm sure it's adequate for a stock engine and the few I know about appear to be fastener related. If you're going to use the factory hardware, do as Ford says and replace the bolt with a new one. ARP, and really most standard bolts for that matter, are not torque to yield, and can be reused if not over torqued. If not ARP, it might by wise to use something at least grade 10.9 or better. Make sure that bolt is as long as the factory bolt. If it's longer, make sure it's not bottoming on the bottom of the hole, which would impact necessary clamping force on the bolt. It may interest you to know ARP does not have a specific "balancer bolt" listed for the GT500. Vendors are selling universal ARP bolts for this application. If you have an aftermarket balancer, follow the manufacturer's recommendations on inspection and rebuilding. A balancer that's not doing its job can make it hard for a bolt to keep its tension if harmonics get excessive.</p><p></p><p>Larger diameter balancers, much high boost pressures and bigger blowers with heavier rotors were never a design concern for Ford. Drag slicks and 2 steps only exacerbate the issue. As long as the fastener they used held together through the warranty period, it met their criteria. TTY bolts are used because they're light weight, not because they're better. Auto manufacturers are concerned with lighter materials to help meet CAFE fuel standards. That's where that comes from. Should you do it or not, depends on how much confidence you have in a $10 bolt preventing damage to a $20k engine, depending on use. Did you, or a previous owner/shop correctly tighten the TTY bolt in accordance with Ford's instruction? TTY bolts are intended to stretch on installation and reusing them is asking for a possible failure. If installed correctly, I'm sure it's fine for most street use.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16487950, member: 124025"] I'm sure it's adequate for a stock engine and the few I know about appear to be fastener related. If you're going to use the factory hardware, do as Ford says and replace the bolt with a new one. ARP, and really most standard bolts for that matter, are not torque to yield, and can be reused if not over torqued. If not ARP, it might by wise to use something at least grade 10.9 or better. Make sure that bolt is as long as the factory bolt. If it's longer, make sure it's not bottoming on the bottom of the hole, which would impact necessary clamping force on the bolt. It may interest you to know ARP does not have a specific "balancer bolt" listed for the GT500. Vendors are selling universal ARP bolts for this application. If you have an aftermarket balancer, follow the manufacturer's recommendations on inspection and rebuilding. A balancer that's not doing its job can make it hard for a bolt to keep its tension if harmonics get excessive. Larger diameter balancers, much high boost pressures and bigger blowers with heavier rotors were never a design concern for Ford. Drag slicks and 2 steps only exacerbate the issue. As long as the fastener they used held together through the warranty period, it met their criteria. TTY bolts are used because they're light weight, not because they're better. Auto manufacturers are concerned with lighter materials to help meet CAFE fuel standards. That's where that comes from. Should you do it or not, depends on how much confidence you have in a $10 bolt preventing damage to a $20k engine, depending on use. Did you, or a previous owner/shop correctly tighten the TTY bolt in accordance with Ford's instruction? TTY bolts are intended to stretch on installation and reusing them is asking for a possible failure. If installed correctly, I'm sure it's fine for most street use. [/QUOTE]
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