you would think there is a place we could find liek minded indiviuals to collectively gather resources to supply material, equipment, knowledge and finances to persue such an informative endeveor..
And doesnt that sort of responsibility fall on the guy who sells them?
One would think so, Tom. (No offense, T.)
I dont mean any offense either. He's a friend of mine. But you'd be nuts (no pun intended) to just slap em on and guess on a torque setting when you are heading out to the track. It is important that you preload these studs with the right torque.
150 is completely in-bounds for an M14x1.5 w/o lube. There's still a ways to go before you get into plastic deformation of the stud (thus the +/- 15 lb-ft value). That tolerance also takes into account torque wrench accuracy (most are within 1-2%). There's many engineering handbooks available to give you an idea of what the reduced torque should be, depending on the lube type. Those guidances are based on large, statistically valid test data. While yes, to understand if the specific lube and specific torque on the specific wheel and specific lug nut is achieving the target bolt stretch, you'd have to measure it, you're getting into the small single digit percentage differences that ultimately don't matter if you're near the middle of an acceptable range. Do you even know the target clamp load and the bolt stretch required?
Yes, I agree. Ford specifies 150 +\- 15
Yes, but not an engineer that will give you that data... ARP wouldn't because of what I suspect is liability
And that's where a guy like you comes in. You are a mechanical engineer with the certifications to calculate and provide such data. Care to do an analysis and publish the results?
I agree. I'm not talking about balls on when in the range is acceptable. kinda like measuring with a micrometer and cutting with a chain saw, lol
No, but I know you are deeply rooted in the business. Its probably just a phone call away.
Tom: Going to the track isn't something that's gonna happen in Sarah's life and hopefully, T or someone will come up with a torque RANGE at least for Ti and lubricant. I sure don't want those pretty lugs and nuts just sitting on the bench in the garage. :-)
don't get me wrong. I have two sets of them. They are works of art. Just someone with some engineering skills needs to establish a setting.
The factory studs are an M14 x 1.5 size. That correlates to a .551 (or ~9/16") and the closest number of threads on the chart would be 18, so look at the 9/16" x 18tpi columns. I forget what grade the factory studs are but I'll look to see what I've pressed out in the past. Regardless, charts like the ones linked are still generic as there are quite a few variables that have an impact that aren't necessarily given consideration.
I use 120 ft/lb on R's with Signature SV902s and titanium lug nuts.
