Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Please play nicely.  No one wants to listen/read a keyboard warriors rants....

Pages: 1 2 [3] 4  All   Go Down

Author Topic: Tyres  (Read 7043 times)

0 Members and 1 Guest are viewing this topic.

ronnyd

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Bury St Edmunds Suffolk
  • Posts: 8591
    • Vectra 1.8 SRI Silver
    • View Profile
Re: Tyres
« Reply #30 on: 02 March 2018, 19:22:25 »

An offer he couldn,t refuse. :y
Logged

johnnydog

  • Omega Knight
  • *****
  • Offline Offline
  • Gender: Male
  • Lancashire
  • Posts: 1789
    • 2.6 & 3.2 sal, 3.2 est
    • View Profile
Re: Tyres
« Reply #31 on: 04 March 2018, 00:52:27 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
Logged
2002 3.2 Elite saloon, 2003 3.2 Elite estate, 2003 2.6 Elite saloon

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 105837
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: Tyres
« Reply #32 on: 04 March 2018, 09:23:59 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
I am racking my brains the last time we had what I'd class bad (in reference to winter tyres) weather here in Blighty.  I reckon it was about 10 or more years ago when we were my outside thermometer was reading -18C, and our water meters kept freezing up.

Obviously, some parts of the country suffered a lot of flooding 2 or 3 years back, but winter tyres wouldn't have helped there.


So I stand by my comments that we do not have enough bad weather here that means a quality summer tyre isn't able to cope.


I bought some snow chains about 10yrs ago for the Omega. So far, the only benefit I can see from them is the extra weight with them in the boot over the rear axle.  Never fitted, apart from to see how to fit them.
Logged
Grumpy old man

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 105837
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: Tyres
« Reply #33 on: 04 March 2018, 09:27:36 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
And to back it up, look how mainstream media have got excited over this cold snap for the past few days, where, to be honest, the only issue has been the wind causing drifts, not the amount of snowfall.

Christ, we had more in early December.
Logged
Grumpy old man

robson

  • Omega Knight
  • *****
  • Offline Offline
  • Gender: Male
  • Nr Ashford Kent
  • Posts: 1825
    • 2.6 facelift 2003
    • View Profile
Re: Tyres
« Reply #34 on: 05 March 2018, 13:18:41 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.
Logged

Entwood

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • North Wiltshire
  • Posts: 19566
  • My Old 3.2 V6 Elite (LPG)
    • Audi A6 Allroad 3.0 DTI
    • View Profile
Re: Tyres
« Reply #35 on: 05 March 2018, 13:23:15 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.

My TPMS was bleating quite a lot during the cold spell, over 6 psi low in all 4 tyres, until I'd driven about 10-15 miles when they were back to normal-ish....

HUGE difference in pressure when the tyre temp is -6 C to when it is at +7 C, and in the summer they get very much warmer !! It's only since i got the TPMS that I realised just how much the pressures change with temperature ... I "knew" it in the back of my mind .. but had never given it much notice !!

:)
Logged

Migv6 le Frog Fan

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Webs End.
  • Posts: 11732
  • Nicole's Papa
    • 3.2 Elite. Boxster. C1.
    • View Profile
Re: Tyres
« Reply #36 on: 05 March 2018, 13:27:40 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\
Logged
Women are like an AR35. lovely things, but nobody really understands how they work.

Doctor Gollum

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • In a colds and darks puddleses
  • Posts: 28089
  • If you can't eat them, join them...
    • Feetses.
    • View Profile
Re: Tyres
« Reply #37 on: 05 March 2018, 13:51:39 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\
Nah, more volume in a given space=higher pressure  ;)
Logged
Onanists always think outside the box.

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36266
    • Jaguar XE 25t, Westfield
    • View Profile
Re: Tyres
« Reply #38 on: 05 March 2018, 14:04:07 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.

My TPMS was bleating quite a lot during the cold spell, over 6 psi low in all 4 tyres, until I'd driven about 10-15 miles when they were back to normal-ish....

HUGE difference in pressure when the tyre temp is -6 C to when it is at +7 C, and in the summer they get very much warmer !! It's only since i got the TPMS that I realised just how much the pressures change with temperature ... I "knew" it in the back of my mind .. but had never given it much notice !!

:)

Interesting. On the other hand, you probably want to be running lower pressures when it's that cold to get a bit of heat into the tyres and provide better grip on snow and ice, so it's perhaps just nature working in our favour?
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

Doctor Gollum

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • In a colds and darks puddleses
  • Posts: 28089
  • If you can't eat them, join them...
    • Feetses.
    • View Profile
Re: Tyres
« Reply #39 on: 05 March 2018, 14:28:23 »

A softer tyre would provide a marginally greater footprint...

One of those things that can easily be overthought...
Logged
Onanists always think outside the box.

Entwood

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • North Wiltshire
  • Posts: 19566
  • My Old 3.2 V6 Elite (LPG)
    • Audi A6 Allroad 3.0 DTI
    • View Profile
Re: Tyres
« Reply #40 on: 05 March 2018, 15:08:00 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\

Nope .. tyre changes size by very little so is a, relatively, fixed volume. ...

Charles Law, Boyles Law, Gay-Lussacs  Law.... put together to form the Combined gas laws  and you get

"The ratio between the pressure-volume product and the temperature of a system remains constant"  or PV/T=k or PV=kT

In your tyre the constant k and the Volume V don't change, so if T goes down, so must P ...   :)

I had just never realised by how much P changes with T ...
Logged

tunnie

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • Surrey
  • Posts: 37511
    • Zafira Tourer & BMW 435i
    • View Profile
Re: Tyres
« Reply #41 on: 05 March 2018, 15:52:19 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.
Logged

Entwood

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • North Wiltshire
  • Posts: 19566
  • My Old 3.2 V6 Elite (LPG)
    • Audi A6 Allroad 3.0 DTI
    • View Profile
Re: Tyres
« Reply #42 on: 05 March 2018, 16:03:48 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.

That's the theory, and why dry Nitrogen is used in aircraft tyres. .....   One of the biggest constituents of "normal" air is water vapour, and it changes volume with temperature by a large degree, it also condenses out, then freezes, at low temperatures. As aircraft tyres are subject to temperatures of -40 odd C at altitude, and they don't warm up much in the descent, IF water vapour was allowed into the tyres it would be a frozen lump at the bottom of the wheel at the point of touchdown, at which point the wheel is still stationary ... it then, very rapidly, gets spun up to a high rotational speed .... that lump of ice would cause MAJOR imbalance and SEVERE vibrations !!! (been there, got the T-shirt.... tyre was severely damaged.. but we expected it .. :) This was a C130 tyre which is HUGE )



I guess car tyres suffer the same, but to a far smaller degree, due to the much lower volume of air.
« Last Edit: 05 March 2018, 16:12:38 by Entwood »
Logged

Bigron

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Witham, Essex
  • Posts: 4808
    • Omega 2.6 V6 Auto '51 Reg
    • View Profile
Re: Tyres
« Reply #43 on: 05 March 2018, 17:01:53 »

Thanks for that explanation, Nige; I thought nitrogen in my car tyres was just another "Emperor's New Clothes" con trick when offered it at Kwik-Shit some time ago!  ::)

Ron.
Logged

tunnie

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • Surrey
  • Posts: 37511
    • Zafira Tourer & BMW 435i
    • View Profile
Re: Tyres
« Reply #44 on: 05 March 2018, 17:09:07 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.

That's the theory, and why dry Nitrogen is used in aircraft tyres. .....   One of the biggest constituents of "normal" air is water vapour, and it changes volume with temperature by a large degree, it also condenses out, then freezes, at low temperatures. As aircraft tyres are subject to temperatures of -40 odd C at altitude, and they don't warm up much in the descent, IF water vapour was allowed into the tyres it would be a frozen lump at the bottom of the wheel at the point of touchdown, at which point the wheel is still stationary ... it then, very rapidly, gets spun up to a high rotational speed .... that lump of ice would cause MAJOR imbalance and SEVERE vibrations !!! (been there, got the T-shirt.... tyre was severely damaged.. but we expected it .. :) This was a C130 tyre which is HUGE )



I guess car tyres suffer the same, but to a far smaller degree, due to the much lower volume of air.

Thanks, those C130 tyres put things into perspective!
Logged
Pages: 1 2 [3] 4  All   Go Up
 

Page created in 0.04 seconds with 18 queries.