Tyre pressures and temps.

[Hutch]

Got away from RMK, (Rural Milton Keynes) on route to Gwithian, Cornwall, With a stop at Peak view cl site Rooksbridge, BS26 2UA. FSP, £18 . Just south of Sedgemoor services. Lovely little local pub 10 minutes walk from the site.

Left RMK and watching the Tyre pal, left home both tyres at 64 psi and 17 ⁰c( doesn't happen often) once out of RMK and on straight road I noticed the tyre pressures were matched at 71 psi but the left tyre was showing 22⁰c and the right 24⁰c .

As we went through rain the tyre pressures matched, also the tyre temps matched with the 2 ⁰c difference. ie 69 psi, and 20 ⁰c /22⁰c.
Checked the next day,,and the reading matched the day before, the tyre pressures matched The right hand Tyre was 2⁰c above the left.

All I can think of is my cars exhaust is on the right hand side of the car. Giving the rise in temperature.

Anyone else noticed this.

 

[RogerL]

It may be a minor difference in brake shoe clearance - or minor differences in the TPMS battery state of charge.

 

[toad a caravan]

Hutch,are you stopping in Cornwall?

 

[Buckman]

Could be a variation in the compounds in the tyre as have noticed this on many occasions even with the tyres on the car?

 

[Beardy]

Could be a variation in the compounds in the tyre as have noticed this on many occasions even with the tyres on the car?

Is it easier to spot with the tyres off the car?

 

[Beardy]

All I can think of is my cars exhaust is on the right hand side of the car. Giving the rise in temperature.

Anyone else noticed this.

I doubt that its relevant in your case, but I've noticed a slight difference in pressure when the car has been parked with the sun on one side for a couple of hours. (I don't have temperature monitoring).

You do have quite a significant change in pressure though, 10 degrees C is supposed to change the pressure by 1 to 2 PSI, you're seeing much more than that.

 

[Hutch]

I doubt that its relevant in your case, but I've noticed a slight difference in pressure when the car has been parked with the sun on one side for a couple of hours. (I don't have temperature monitoring).

You do have quite a significant change in pressure though, 10 degrees C is supposed to change the pressure by 1 to 2 PSI, you're seeing much more than that.

I have always noticed a change in pressure of 5 to 7 psi cold to running, but never noticed a difference in temps. Except if the sun is on one side, it's just that every thing was identical before setting off.

 

[Hutch]

Hutch,are you stopping in Cornwall?

Yes, we are at Gwithian Farm caravan site, 3 miles from Hale , until 29th.

 

[Dustydog]

Yes, we are at Gwithian Farm caravan site, 3 miles from Hale , until 29th.

You devil! Only a spit from the Red River🍺🍺🍷🍷

 

[Hutch]

You devil! Only a spit from the Red River🍺🍺🍷🍷

Pitch 3, less than 100 yards.

 

[Sam Vimes]

Never ceases to amaze me that for years we managed without such devices and now we have them we get worried over the small variations that have probably always occured.

 

[ProfJohnL]

We seem to lulled iso easily into a false sense of security when anything is "digitally controlled"

The differences reported in this thread might all be within the equipment's specified limits of accuracy.

 

[RogerL]

We seem to lulled iso easily into a false sense of security when anything is "digitally controlled"

The differences reported in this thread might all be within the equipment's specified limits of accuracy.

I recall doing some consultancy work in the '80s for Otter Controls, who made fixed temperature thermostatic switches for the car industry - the switches couldn't be made with any level of consistency so every single one was tested and calibrated with wealthier car makers paying a higher price for a smaller range variation and the mass manufacturers paying a lower price for a much wider temperation variation.

Whilst I imagine the equivalent modern product has smaller numeric variations I'd expect the principle to be the same.