Titanium Wheel Bolts
Discussion
Saw these mentioned on rennlist a while back and wondering if anyone has tried them? Not sure the weight saving is enormous, but unsprung mass is never cheap to shed.
The manufacturer is www.poggipolini.it/ and they seem to make the bolts used on the 360 CS and in F1. Pair them up with some Dymag carbon wheels & ceramic brakes and its going to be a meaningful saving in unsprung weight.
Apparently the bolts are about 550 USD a set.
wildoliver said:
If your serious about getting some give me a call I might be able to help, I get a lot of machining work done and should be able to get some machined up quite a bit cheaper.
I'm sure I'm teaching you to suck eggs here but if you do get some machined make sure that the threads are rolled rather than cut!
wildoliver said:
If your serious about getting some give me a call I might be able to help, I get a lot of machining work done and should be able to get some machined up quite a bit cheaper.
It could just be the companies PR, but it seems like a rather involved process to make these propery with forged heads and rolled threads. Is that what you would be proposing doing?
Tim - dunno if these are allowed in motorsport or not. The manufacturer I named makes the bolts used on the 360CS though (I think anyway), so presumably they can't be that dangerous?
I agree on the rolling threads, obviously if they were cut then they would not be as strong, however I must be honest I don't really see the reason for a forged head, as long as a good engineering company is used that understands metallurgy I don't really see it being a great problem, can someone please confirm if the gt3/turbo/gt2 wheel bolts are the same as standard 996? If so I have some on my old mans I can see about getting a tester made up to see how it goes.
Edited by wildoliver on Friday 29th September 13:08
wildoliver said:
I agree on the rolling threads, obviously if they were cut then they would not be as strong, however I must be honest I don't really see the reason for a forged head, as long as a good engineering company is used that understands metallurgy I don't really see it being a great problem, can someone please confirm if the gt3/turbo/gt2 wheel bolts are the same as standard 996? If so I have some on my old mans I can see about getting a tester made up to see how it goes.
Edited by wildoliver on Friday 29th September 13:08
This is why they forge the heads :
www.poggipolini.it/default.php?t=site&pgid=22
Why they roll threads (which I'm sure you know!) :
www.poggipolini.it/default.php?t=site&pgid=23
To be honest I'm not likely to buy a set so please don't go to any expense on my account. I posted the info as a few people have asked for more info when I mentioned them, and people like Tim can't resist carbon fibre and titanium
I believe that the only non ferrous wheel fastenings allowed by the MSA are those used for centrelock hubs. Therefore I guess these titanium ones would be illegal - if anyone noticed. I would also suggest that no one could possibly notice the difference in unsprung weight on the car so the only reason to have them would be that "feel good" factor!!! On the older 911 Porsche used aluminium wheel nuts and when I changed these for steel - in my hillclimb days - I can honestly say there was absolutely no difference.
Richard.
Richard.
935 said:
I believe that the only non ferrous wheel fastenings allowed by the MSA are those used for centrelock hubs. Therefore I guess these titanium ones would be illegal - if anyone noticed. I would also suggest that no one could possibly notice the difference in unsprung weight on the car so the only reason to have them would be that "feel good" factor!!! On the older 911 Porsche used aluminium wheel nuts and when I changed these for steel - in my hillclimb days - I can honestly say there was absolutely no difference.
Richard.
Richard.
Don't tell Tim....
He's already bought 10 sets....
Yes I realise the metallurgical advantages of forging the head, I just don't see it as being necessary, unlike the rolled threads on an expense v benefit scale.
If it was me I personally would have them made from stainless cut from hex bar with a cut thread, but there is no way way I would sell them due to not being able to guarantee how they would be used, this is going to have to be one I will have to back out gracefully from I can see far too many liability issues if something goes wrong I'm afraid.
If it was me I personally would have them made from stainless cut from hex bar with a cut thread, but there is no way way I would sell them due to not being able to guarantee how they would be used, this is going to have to be one I will have to back out gracefully from I can see far too many liability issues if something goes wrong I'm afraid.
Having driven to the Porsche Speed Events this year then changing the wheels twice at every meeting both the hub and wheel nuts look in a right state
I use a wheel gun and when its *issing rain you tend not to be 100% precise
how the bolts go on
So I think I need new bolts/hubs this winter so anything which Is stronger
Im open to Ideas !
tim
I use a wheel gun and when its *issing rain you tend not to be 100% precise
how the bolts go on
So I think I need new bolts/hubs this winter so anything which Is stronger
Im open to Ideas !
tim
timmo said:
Having driven to the Porsche Speed Events this year then changing the wheels twice at every meeting both the hub and wheel nuts look in a right state
I use a wheel gun and when its *issing rain you tend not to be 100% precise
how the bolts go on
So I think I need new bolts/hubs this winter so anything which Is stronger
Im open to Ideas !
tim
I use a wheel gun and when its *issing rain you tend not to be 100% precise
how the bolts go on
So I think I need new bolts/hubs this winter so anything which Is stronger
Im open to Ideas !
tim
Ti is stronger I think, but also more susceptible to fatigue. Its probably a crap idea overall. I only started wanting them when I found out that poxy italian shed the 360 CS had them
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