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I purchased an RCA kit from an authorized dealer and upon installing the kit 3 bolts stretched and 1 bolt snapped @ 83ft-lbs (factory spec.) Has anyone had this issue? I emailed Megan Racing to tell them what happened and what torque spec they recommend. No instructions were given in the box.
The bolt head has a 10 on it meaning its a 10.9 Grade bolt and using calipers to measure the shaft diameter came out to 11.13mm meaning its an M12 bolt which should handle 114 ft-lbs of torque.
Update: I calibrated my torque wrench and it was off by 10 ftlbs, so I was torquing to 93ftlb and that's what caused it to stretch and snap. Still, the bolts should have been able to handle more. Take caution when torquing the bolts that come with Megan RCAs.
The one on the right shows some serious stretching.
A bad batch, probably not hardened correctly, not Megan’s fault but the supplier. I have an MR bar arriving tomorrow in fact; I’ll take a hard look at the bolts. Thanks for posting.
I've been thinking about getting the Megan RCA kit. I haven't seen a bolt stretch like that before, but I don't have much experience with torque wrenches.
I've been thinking about getting the Megan RCA kit. I haven't seen a bolt stretch like that before, but I don't have much experience with torque wrenches.
In the “real world” - that grade hardened steel bolt would take vastly more torque than that w/o stretching or fracturing. That’s simply not hardened at all.
This is sadly a thing. Toyota had problems with it in many cases - transmission internal bearings not hardened adequately and failing from a bad supplier, Aisin built a lot of water pumps with bad bearings like this that forced many warranty repairs and even some seized engines.
I've been thinking about getting the Megan RCA kit. I haven't seen a bolt stretch like that before, but I don't have much experience with torque wrenches.
There are companies that take care to make good products and support the community instead of aiming to be the cheapest available option.
09-05-24, 12:41 PM
Megan Racing RCA Bolt Snapping and Stretching
