Bugatti Veyron wheels? Mental.
Discussion
SeeNoWeevil said:
I'm actually finding the Veyron talk (the justification for more expense *not* painting a carbon car specifically) *and* the valve talk quite interesting (I thought valve caps were for keeping the valve clean but the 'seal' guys have won me over). This thread is like a buy-one-get-one-free.
Does the Veyron have shiny metal (carbon?) valve caps with a logo or boring black plastic ones?
Someone needs to pop down to their local VW dealership and try to order a Veyron dust cap. I'm guessing its CNCed out of unobtanium and they recommend its replacement every 10k turns of the wheel due to disorientation of the molecular structure caused by the earth's magnetic field.Does the Veyron have shiny metal (carbon?) valve caps with a logo or boring black plastic ones?
btw test rig for the valve can will be done tomorrow.
SeeNoWeevil said:
I'm actually finding the Veyron talk (the justification for more expense *not* painting a carbon car specifically) *and* the valve talk quite interesting (I thought valve caps were for keeping the valve clean but the 'seal' guys have won me over). This thread is like a buy-one-get-one-free.
Does the Veyron have shiny metal (carbon?) valve caps with a logo or boring black plastic ones?
I think Halfords have some bare carbon ones in their range of Veyron accessories, top shelf, next to the lightweight furry dice. Does the Veyron have shiny metal (carbon?) valve caps with a logo or boring black plastic ones?
Sorry for the delay but I've been stuffing my face with chocolate eggs.
Here's the rig:
I have a newfound respect for those who have to make leak proof welds for a living. I had about a dozen leaks first time round.
The short valve is the inlet, it has a valve core. The long valve is the valve cap tester, no core. The first cap I tried leaked. When I had a look inside the seal had an obvious defect. The seal is moulded into the cap, it's all made of the same black plastic.
The second cap I tried has no obvious leaks. My compressor goes to 105psi. Using a gauge loses a few psi, down to about 98psi. So if I test it again it should show 90psi. I've now capped the inlet valve.
Place your bets.
Here's the rig:
I have a newfound respect for those who have to make leak proof welds for a living. I had about a dozen leaks first time round.
The short valve is the inlet, it has a valve core. The long valve is the valve cap tester, no core. The first cap I tried leaked. When I had a look inside the seal had an obvious defect. The seal is moulded into the cap, it's all made of the same black plastic.
The second cap I tried has no obvious leaks. My compressor goes to 105psi. Using a gauge loses a few psi, down to about 98psi. So if I test it again it should show 90psi. I've now capped the inlet valve.
Place your bets.
I'd hold that whole test rig under water for a while, as I'd wager you are losing air from the porous welds rather than the valve cap. 
You can hold 30psi back with your finger, over a hole the size of a tyre valve, no fancy cap with O ring required, so the simple cheap plastic cap should seal it, at 30psi anyway
You can hold 30psi back with your finger, over a hole the size of a tyre valve, no fancy cap with O ring required, so the simple cheap plastic cap should seal it, at 30psi anyway
I've done some industry approved testing (fairy liquid) on the whole thing and it seems OK. I think I'm ready to move onto nuclear reactors now 
I am slightly bothered that the first cap didn't seal. I reckon if you used a metal cap with a proper o-ring it would seal very reliably. The plastic ones, based on my sample size of two, are maybe not that good.
I am slightly bothered that the first cap didn't seal. I reckon if you used a metal cap with a proper o-ring it would seal very reliably. The plastic ones, based on my sample size of two, are maybe not that good.
Gibbo998 said:
How can you bunch of tossers turn an interesting thread, that could have bought some gems about one of the World's greatest super cars, into a mind numbing discussion on valves!!!
Please get a life, you w
kers.
It's become quite clear that 10p plastic dust caps are more interesting than a set of VW wheels. So why don't you jog on you stupid arse. Please get a life, you w
kers.007 VXR said:
projectgt said:
I know of an F1 driver who got rid of his Veyron because of the cost of wheels/tyres...thought it was utterly ridiculous.
anyone that buys one will know the cost before buying, so cant see the issue , unless he is stupid?Anyway back on topic I had occasion to look at the valve caps on my car today and saw they had rubber o-rings to aid air retention, did not know that before this thread.
I believe Harry Metcalfe in Evo put it fairly succinctly when talking about insurance for a McLaren F1...
I may be paraphrasing, but it went along the lines of "Just because these people can afford something, doesn't mean they like spending the money"
I know plenty of self-made millionaires and they are generally pretty careful with money and I know a few Ferrari owners who will shop around as they are convinced they are "being had" by Maranello pricing etc...
Let's face it, most of us on here know that BMW etc... charge an arm and a leg for an "M" disc when it isn't anything special, the Veyron wheels just seem like a much higher end version of the same thing. I'd be pretty upset with that if I had one.
I may be paraphrasing, but it went along the lines of "Just because these people can afford something, doesn't mean they like spending the money"
I know plenty of self-made millionaires and they are generally pretty careful with money and I know a few Ferrari owners who will shop around as they are convinced they are "being had" by Maranello pricing etc...
Let's face it, most of us on here know that BMW etc... charge an arm and a leg for an "M" disc when it isn't anything special, the Veyron wheels just seem like a much higher end version of the same thing. I'd be pretty upset with that if I had one.
BigBen said:
007 VXR said:
projectgt said:
I know of an F1 driver who got rid of his Veyron because of the cost of wheels/tyres...thought it was utterly ridiculous.
anyone that buys one will know the cost before buying, so cant see the issue , unless he is stupid?Anyway back on topic I had occasion to look at the valve caps on my car today and saw they had rubber o-rings to aid air retention, did not know that before this thread.
007 VXR said:
So... You buy a 1.5m car and dont read the contract you have to sign ?
I imagine that quite a few sports stars will firstly be investing all their efforts in trying to get some form of 'cross' down on the contract in the first instance and secondly have their agent with them who takes care of all these trivial matters. In short, I doubt many people ever read any contract whether they earn £20k or £20m a year. Humans are humans. Money doesn't change genetics.
For example, if the story transpired to be about Jean Allessi then no one would doubt it. If it were about Vettel then you'd be suspect.
supersingle said:
Sorry for the delay but I've been stuffing my face with chocolate eggs.
Here's the rig:
I have a newfound respect for those who have to make leak proof welds for a living. I had about a dozen leaks first time round.
The short valve is the inlet, it has a valve core. The long valve is the valve cap tester, no core. The first cap I tried leaked. When I had a look inside the seal had an obvious defect. The seal is moulded into the cap, it's all made of the same black plastic.
This is interesting. Here's the rig:
I have a newfound respect for those who have to make leak proof welds for a living. I had about a dozen leaks first time round.
The short valve is the inlet, it has a valve core. The long valve is the valve cap tester, no core. The first cap I tried leaked. When I had a look inside the seal had an obvious defect. The seal is moulded into the cap, it's all made of the same black plastic.
Perhaps the pressure in your test rig will settle to something like, say, 50 psi - as long as the valve cap is an effective seal up to about 40-50 psi then that would always be sufficient to seal a car tyre, right? Even a Veryron's at 250mph? Especially as the centrifugal force would be pushing the valve cap down onto the stem?
996TT02 said:
As for centrifugal force opening a valve, I don't know, certainly theoretically possible, the force keeping a valve closed at a given air pressure can be relatively easily determined knowing the diameter of the valve insert seal, and the centrifugal force the valve is subjected to at a certain radius and angular velocity, too, knowing the mass of this same valve insert, so if anyone is up to it they can do the measuring and maths and find out. I suspect that valve makers have this sussed out however.
The centrifugal force acts in an OUTWARD direction (obviously), so the centrifugal force on the valve core is ADDED to the force being applied to the valve core by the tyre pressure. I am making efforts to get out more. Re the original posting, I suspect the mileage change limit for a Veyron wheel would apply if the wheel was run at maximum RPM and maximum load CONTINUOUSLY. Which it obviously won't be.Edited by robinessex on Wednesday 8th April 09:58
007 VXR said:
projectgt said:
I know of an F1 driver who got rid of his Veyron because of the cost of wheels/tyres...thought it was utterly ridiculous.
anyone that buys one will know the cost before buying, so cant see the issue , unless he is stupid?007 VXR said:
So... You buy a 1.5m car and dont read the contract you have to sign?
remember it won't be in the contract - it would be in the manual and service schedule. This whole wheels issue depends on whether you believe the statement in the OP or the more reasonable proposition on p4 of this thread.robinessex said:
The centrifugal force acts in an OUTWARD direction (obviously), so the centrifugal force on the valve core is ADDED to the force being applied to the valve core by the tyre pressure.
I wonder how much of a problem that is. What pressures/forces are involved? Note that that same centrifugal force is throwing the air towards the tread of the tyre as well.Gassing Station | General Gassing | Top of Page | What's New | My Stuff