Bugatti Veyron wheels? Mental.
Discussion
zeDuffMan said:
I don't think it's an issue of whether millionaires can afford it or not, it's more they don't like being totally ripped off. I've read a few stories of owners that are sick of the high mandatory maintenance costs associated with the Veyron. And if you don't stick to the schedule, Bugatti won't touch the car at all.
Yep, it does sound like either crap engineering or a rip off. Pity this thread got derailed by the valve cap debate.
TA14 said:
zeDuffMan said:
I don't think it's an issue of whether millionaires can afford it or not, it's more they don't like being totally ripped off. I've read a few stories of owners that are sick of the high mandatory maintenance costs associated with the Veyron. And if you don't stick to the schedule, Bugatti won't touch the car at all.
Yep, it does sound like either crap engineering or a rip off. Pity this thread got derailed by the valve cap debate.
Definitly a rip off way for Bugatti to claw some money back on the car.
King Herald said:
BigBen said:
King Herald said:
None of you rocket scientists have ever seen a proper valve cap then: metal, with an o ring seal inside? No, thought not.
Ah you mean like the ones not used on the wheels of most cars?http://en.wikipedia.org/wiki/Schrader_valve
"Some valve caps have a rubber-washer seal (or a synthetic-rubber-washer seal) inside to help make a hermetic seal (airtight seal). Such a rubber-washer-sealing-type cap also helps prevent air from escaping from a slightly leaking valve".
http://www.tirerack.com/tires/tiretech/techpage.js...
"High-speed pressure loss and core contamination are several of the reasons why valve caps should always be used. In case anything disrupts the valve core's seal, the valve cap provides a backup seal that prevents air from escaping. And while using valve caps will make it take longer to check tire pressures in the pits at a racetrack, the consequence of having a tire lose pressure is much worse".
http://www.agcoauto.com/content/news/p2_articleid/...
"The valve stem cap is extremely simple, yet misunderstood and can be the cause of a good many problems. Tires that do not hold air are often caused by missing valve stem caps. Vehicles often come in for wheel alignment only to find a low tire, caused by a missing valve stem cap"
"The Schrader valve is intended to allow for inflation, deflation and as a temporary seal. It is not designed to be a full-time seal. Sealing the stem is the job of the valve stem cap. Without the cap, the tire will eventually loose air."
Need I go on, stating the obvious and the sensible? What do you all naysayers seem to think the gain is by denying the logical??? If you're happy to do 100mph with your tyre air held in by the same valve core your child's bicycle has in its tyres, feel free, but I like to err on the side of caution.
007 VXR said:
Monty Python said:
The info I have is that every fourth tyre change the wheels are stress tested for cracks and only replaced if necessary.
Just read that as well.Cemesis said:
King Herald said:
Drivel!
The valves are there merely to let you inflate the tyres. The valve CAPS are there to seal the tyres.
Therefore the valve being 'lifted by centrifugal force' will allow nothing leak from the tyre.
Basic car maintenance 101, my friend, always use valve caps.
The cap is there to stop debris getting in the valve. A plastic cap will obviously not seal the air in the tyre.The valves are there merely to let you inflate the tyres. The valve CAPS are there to seal the tyres.
Therefore the valve being 'lifted by centrifugal force' will allow nothing leak from the tyre.
Basic car maintenance 101, my friend, always use valve caps.
Impasse said:
007 VXR said:
Monty Python said:
The info I have is that every fourth tyre change the wheels are stress tested for cracks and only replaced if necessary.
Just read that as well.TA14 said:
I do wonder about the Veyron and it's running costs. Most posters on the internet seem to suggest that it costs about five to ten times the cost of running an F1
10K for a new fuel tank ?did you mean F40?
an F1 car costs a whole lot more.
Edited by 007 VXR on Monday 30th March 11:53
Edited by 007 VXR on Monday 30th March 11:53
king valve cap debate!!!007 VXR said:
TA14 said:
I do wonder about the Veyron and it's running costs. Most posters on the internet seem to suggest that it costs about five to ten times the cost of running an F1
10K for a new fuel tank ?did you mean F40?
an F1 car costs a whole lot more.
Edited by 007 VXR on Monday 30th March 11:53
Edited by 007 VXR on Monday 30th March 11:53
BigBen said:
Clearly they are a good belt and braces idea, but I stand by the fact they are not used on most cars. In fact I am fairly sure the faster of my cars has valve caps rather than dust caps, I am also sure the others don't, I suspect the major vehicle OEMs would not be selling cars which were unsafe at higher speeds for want of a 3p part.
Even the cheapest plastic OEM 'dust' cap will seal the valve, make it air tight. Baring in mind the actual valve core is the same as you find in a childs bicycle, I'd be worried about not having a valve cap of any sort on it.
Mr2Mike said:
marmitemania said:
Leptons said:
marmitemania said:
No it does not depend on that at all. A little spring and the pressure in the tyre which is huge at even 20 psi keep the valve core closed. The only way centrifugal force would not keep the valve closed is if the valve was mounted horizontally in the centre of the wheel IE right in the very centre where the hub nut and the end of the drive shaft is, anywhere outside of dead centre and centrifugal forces will act. I can't believe that some people cannot grasp this.
Not very clever are you. Allow me to explain:Imagine a wheel. Draw a centre line across the wheel. Now if the valve is mounted on the O/D of the wheel on the Centre line and the valve head is pointing Towards the centre of the wheel, in theory if the wheel spins fast enough the valve could open under its own weight.
The only way the Valve could keep itself shut is if it's mounted on the centre line with its head facing towards the O/D.
So yes. It does depend where the valve is mounted on the wheel.
I had somehow pictured it in head that the valve was on the outside of the rim where the tyre would be. I had a total mindfu@k!!
King Herald said:
Even the cheapest plastic OEM 'dust' cap will seal the valve, make it air tight.
Baring in mind the actual valve core is the same as you find in a childs bicycle, I'd be worried about not having a valve cap of any sort on it.
At the danger of wading into the most boring argument on PH, I feel you need some defending King Herald - you are of course, despite everyones incredulity, correct.Baring in mind the actual valve core is the same as you find in a childs bicycle, I'd be worried about not having a valve cap of any sort on it.
"Valves and their components are ordinarily made of rubber, so they are subject to deterioration over time. Replacing them when you buy new tyres is an inexpensive way to protect your tyres, vehicle and yourself. At high speeds, a cracked, deteriorated rubber valve stem can bend from centrifugal force and allow air loss. The valve cap is also important. It’s the primary air seal and helps to keep out dust and dirt particles."
http://www.michelin.co.uk/tyres/learn-share/care-g...
The valve cap / dust cap (call it what you will) is indeed the primary air seal. This is common advice in the tyre industry and the quote above is from Michelin.
I don't normally mention my line of work on here (as it's not relevant), but it's in tyres (and not fitting them), but if you don't believe me, that's cool - hence the link from a manufacturer above.
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