carcentric
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| posted on 6/2/05 at 04:42 PM |
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Tire pressure (F1 rain tires)
The Discovery Channel (cable network) has been running a series called Biker Build-off - a competition to build choppers on a short time schedule.
Of interest to me was a chopper trike built by Russell Mitchell (apparently an ex-Brit) that used a pair of Formula 1 rain tires on the rear axle.
When he had them mounted, they asked what pressure he wanted to run. His response was "Tire pressure? Oh . . . 20 pounds. Yeah that's
what we always run in our Formula 1 tires. (offside, to camera) How the hell should I know?"
So, now I'm wondering: What tire pressure IS used in Formula 1 rain tires? I'd think it'd be closer to mid-30's than to
20.
[Edited on 6/2/05 by carcentric]
M D "Doc" Nugent
http://www.carcentric.com
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carnut
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| posted on 6/2/05 at 04:52 PM |
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May have to run a different pressure as there isnt as much load on the tryes and they wont get the same amount of heat put into them.
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andylancaster3000
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| posted on 6/2/05 at 05:19 PM |
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F1 tyre pressures are suprisingly low... I think the slicks run at around 14-15psi mark. I wouldn't be at all suprised if that was lower! At the
end of the race the pressures may have gone up by as much 10psi due to the high temperature that the tyres generate (approx 100 degrees c)
As carnut says, in the wet there is not as much load on the tyre therefore not as much heat build up therefore lower temperatures, so to get the
correct running pressures the tyre is initially inflated to around 20psi I would imagine.
Andy
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phelpsa
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| posted on 6/2/05 at 05:22 PM |
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But at normal speeds the car weighs nearly 3t!!
Adam
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Kelvin
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| posted on 6/2/05 at 07:57 PM |
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normal base pressure is about 1.1 bar. The pressures vary depending on circuit, driver, weather (temp) etc.
they don't change pressure too much in use as they are filled with a Nitrogen gas mix, which is more stable in heated situations (no pun
intended) than normal oxygen/air)
Of course, running behind the safety car or slowly will lower the temps and thus the ride height leading to all sorts of problems.
A 20% tyre pressure drop will reduce tyre life by 15%.
kelvin
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