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I never thought about this until reading this thread. Whenever I am changing out my wheels with CenterLocks I am always cursing Porsche. However, I think there is a benefit in rotational mass since all of the centerlock nut is in the center.
Centre locks are used to decrease tire change times on race cars. The rotational mass difference is statistically insignificant.
After having three of five aftermarket fasteners on my rear driver-side wheel fail simultaneously - at street speeds, on level ground, while driving in a straight line - I would discourage folks from bothering with non-Porsche studs/bolts/etc.
For the record: theories including any of the following data points are not required, thanks:
* Everyone and their mother uses them
* I'm the only person to whom this has ever happened
* I am obviously stupid and/or installed them improperly
Just as an FYI the original 996 bolt design has been superseded the new 997 part has a dimple in the middle of the bolt head and the head is slightly shorter.
Sets of the original bolts are difficult to find as most suppliers will have an image of the original bolt then send you the new ones with the dimple.
Interesting, me too. 16 of the bolts on my car are from ~2001 when it was made. The other 4 are from ~2016 when I replaced the wheel locks with regular bolts so I don't have to fuss with the lock socket. All 20 look identical to me, I can't tell them apart.
Grabbed world-motorsports titanium bolts last year, haven't had any back-out issues (drove from Chicago to Austin and back as well). Weight for them is 2.9 Lbs or roughly 1300 grams for the set.
After having three of five aftermarket fasteners on my rear driver-side wheel fail simultaneously - at street speeds, on level ground, while driving in a straight line - I would discourage folks from bothering with non-Porsche studs/bolts/etc.
For the record: theories including any of the following data points are not required, thanks:
* Everyone and their mother uses them
* I'm the only person to whom this has ever happened
* I am obviously stupid and/or installed them improperly
Interesting. Do you have a thread on this? I'd like to hear more.
Titanium fails abruptly unlike steel. It’s not a durable or longevity friendly metal. It’s for race cars not street cars and not for street cars sometimes driven at the track. Don’t believe me, go figure out what happened to the titanium submarines Russia built.... they were light, fast, deep diving.... and then they weren’t.
Titanium fails abruptly unlike steel. It’s not a durable or longevity friendly metal. It’s for race cars not street cars and not for street cars sometimes driven at the track. Don’t believe me, go figure out what happened to the titanium submarines Russia built.... they were light, fast, deep diving.... and then they weren’t.
Now we are comparing submarines to lug bolts? Just because a sub failed it doesn't mean a lug bolt will too. They make motorcycle engines with titanium valves, my dirt bike is one of them and they are not known for valve failures.
Now we are comparing submarines to lug bolts? Just because a sub failed it doesn't mean a lug bolt will too. They make motorcycle engines with titanium valves, my dirt bike is one of them and they are not known for valve failures.
1). Most here lack a sense of humor.
2). Most here can’t comprehend simple analogies.
3). Common sense is quite often the most uncommon thing.
Go do research on the brittle fracture properties on titanium alloys versus other alloys such as steel, aluminum, or even inconel and monel. Simple explanations don’t require dissertation level explanation.
Titanium fails abruptly and suddenly, simlarly like IMS bearings, with little to no warning. Steel is very forgiving and far more durable.
I could prattle on about stress, strain and toughness of alloys and how to measure each, but you wouldn’t get it. I have a book I can recommend or two.
The titanium submarines failed castrophically just like anything designed to be durable might when made of titanium. That’s why anyone that knows about metals would not recommend titanium lug nuts to save a few ounces. The people selling these kinds of products are after your money, I am not. Remember that if you can’t remember anything else.
F1 did a lot of parts in magnesium too, that also didn’t translate well to the non-racing world. Not all racing technology is good for your commuter.
This forum is amazing.... got folks that will worry about hydrolocking an engine in a car wash, but will ignore the brittle fracture properties of titanium, because light and bling.....
I agree that it's a total waste of money but you can't say just because it failed in one application it will do the same in another. Sounds like you are in engineering like myself so it shouldn't be a surprise if I ask where did you get your data that titanium lug bolts are prone to failure? Most failures are due to poor engineering, manufacturing and lack of testing.........or comes don't to chance. What are the chances that X% or more will fail and cost more money to the company in litigation that profit.
Not into the raging debate. I got a set about two years ago. I did so because they don't rust like my old ones did. They have never backed off, broken or anything else but sit there looking beautiful even when I am slightly negligent cleaning up the wheels. Somebody compare the material specs with standard lug bolts here https://www.world-motorsports.com/po...-bolt-set.html old rusted lug bolts with adjacent titanium lug bolt not much to say
Titanium fails abruptly unlike steel. It’s not a durable or longevity friendly metal. It’s for race cars not street cars and not for street cars sometimes driven at the track. Don’t believe me, go figure out what happened to the titanium submarines Russia built.... they were light, fast, deep diving.... and then they weren’t.
Grabbed world-motorsports titanium bolts last year, haven't had any back-out issues (drove from Chicago to Austin and back as well). Weight for them is 2.9 Lbs or roughly 1300 grams for the set.
I got mine from Acer racing, 1 year of usage, about 6 track days. Zero concerns.
05-28-2019, 01:55 PM
