What about using a thread locker on the bolts and use a sleeve retaining compound on the mating surface?
Wouldn't that provide enough grip between the parts to prevent a shearing load on the bolts, and wouldn't the loctite on the bolts prevent them from backing out? Of course, the ARP studs are probably the best choice. -----Original Message----- From: [EMAIL PROTECTED] on behalf of Bill Cardell Sent: Mon 3/31/2008 12:09 PM To: Glenn Ellingson; Miatapower Subject: RE: Question about a supercharger pulley issue.... We carry ARP studs to replace the bolts. Welding the aluminum to steel might be tough.. Bill Cardell TurboDog's Dad www.flyinmiata.com 1-800-FLY-MX5S (sales) 970-242-3800 (tech) 2008 FM Open House: August 14-17 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Glenn Ellingson Sent: Monday, March 31, 2008 10:56 AM To: Miatapower Subject: Question about a supercharger pulley issue.... Fellow powerlisters, I could use some advice on a recurring problem. The car: Ubercharger kit, turned up rather high (66mm pulley @ the s/c; bumped rev limit to 7900, various other bits 'n pieces) on my XP autocross car. The problem: The s/c driving pulley and crank pulley are not remaining attached to each other & the crank pulley boss. The four little bolts holding the pulleys on the car are working their way out or shearing. The bolts have worked themselves loose before and I retightened them, but then 2 events ago 1 bolt worked loose & the other 3 sheared off. So I pulled everything off, attached the two pulleys to a new pulley boss using longer bolts (the stock bolts don't engage very far into the boss with the added thickness of the s/c pulley), reassembled the car, and after ~20 minutes of running (6 minutes of hard use doing autocross runs & the rest just rolling around grid) the pulley was again loose. I havn't disaassembled it yet, but I think 1 bolt sheared & the others loosened up. The pulleys were attached to the boss on a bench; the bolt lengths were good, I used permatex/loctite, and I think I torqued them appropriately (which is pretty light; they are small bolts). Any suggestions for what I might do differently to keep the car together? My current ideas are to replace the crank pulley & machine a new s/c driving pulley in case one or the other has bent/gone out of round. But other suggestions are very welcome. Thanks all, -- Glenn _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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