vcu recon

yu took yo time

Cheers hippo when I did the temp test I was touching the larger circumference of the vcu, I struggled to turn by hand well there was good resistance I mean I could also hear the odd quiet clunk when I was forcing it by hand at first before the tie wraps snapped and I was wearing the level lol��.

The Mad Hat Man said:

yu took yo time

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Busy replying to the wrong post.

Anyway back to my point about heat and different climates, what I meant was heat is a reaction and the energy released from the vcu so it made wonder about different climates like quatar Saudi USA etc as the ambient temp is a lot higher this means the heat cannot dissipate the same from the vcu which must have an effect be it large or small, so as computers etc have different components for different climates for this reason would the vcu require different fluid?

Without wishing to state the obvious, where in the world is the ambient temp 100C?

Lybia gers to around 55/60c that's gotta have an effect of heat dissipation from anything that gives it off.

Irans had 70c recorded

And the energy required to raise the temp from 70C to 100C?

I was recording VCU temps of 12 to 15° C above ambient. I think the VCU temperature is best compared against ambient. This would give you an indication of impending problems.

The Mad Hat Man said:

And the energy required to raise the temp from 70C to 100C?

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Not sure what you mean? If the climate is hotter then heat has a harder time escaping from for force that created it, not saying it makes a diff or if I'm right or wrong I'm just wondering...

I get your point re the areas with a higher ambient temp making detecting the VCU temp more difficult - and the difference betwixt the two may be less. But then the same could be said for the colder regions, ie Norway, Russia... where the ambient temp will have an overall cooling temp so correspondingly the VCU will run cooler too. Would that then equate to the detectable temp being greater?

You could then also say that in equatorial climes with the inherent higher ambient temp's that when the front wheels slip the VCU will react faster to bring the rear wheels in 'play' - the fluid inside already being 'heated'. And of course where it's colder then there may be a lag as the VCU fast to reach a higher temp before 'doing its business'.

This temp difference and the effect it may have would no doubt be difficult to measure - and the delay/advance effect probably minimal anyway.

thequeenscheese said:

Not sure what you mean? If the climate is hotter then heat has a harder time escaping from for force that created it, not saying it makes a diff or if I'm right or wrong I'm just wondering...

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From memory.
Heat is energy. Energy is always lost. In this case, the VCU is above ambient temperature by say 10°C. So for example ambient is 15°C and the VCU measures 25°C.
If ambient temperature rises to 25°C the VCU temperature would also rise by the same 10°C.
This means that the VCU temperature and ambient temperature are nor so relevant, the difference between the two is more important.

But wouldn't the fluids property a stay the same no matter where it is, or for eg warming it up to make it thinner like if you wanted to change it yourself in a 50c plus climate ud imagine it would be warmer already which in turn will make it thinner and react differrently in the vcu? ( presuming the fluid can be heated to make it thinner) and it made me wonder if there's diff specs for different country's?

thequeenscheese said:

But wouldn't the fluids property a stay the same no matter where it is, or for eg warming it up to make it thinner like if you wanted to change it yourself in a 50c plus climate ud imagine it would be warmer already which in turn will make it thinner and react differrently in the vcu? ( presuming the fluid can be heated to make it thinner) and it made me wonder if there's diff specs for different country's?

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From what I've seen. The VCU fluid has the same properties at all ambient temperatures it is likely to used in from -25 to +50°C.

Nodge68 said:

From what I've seen. The VCU fluid has the same properties at all ambient temperatures it is likely to used in from -30 to +100°C.

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corrected for the sake of pedantry

I repeat....


It is a rapid rise in both temperature and pressure that effects the viscosity.

Fair enough,

Quick update on mine 18miles or so and its warm not hot... so for the turnip test maybe a longer run should be advised as mine was cold after 5miles

I read somewhere (specs of fluid etc)that this fluid turns to liquid a -50c......maybe that's how they get it out??.......

Unless its all gelled up and no longer responds how it should...

The Mad Hat Man said:

corrected for the sake of pedantry

I repeat....

It is a rapid rise in both temperature and pressure that effects the viscosity.

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Thanks MHM. I was referring to minimum and maximum ambient temperatures found on earth though!!

We is saying the same thing - just different .

The Mad Hat Man said:

We is saying the same thing - just different .

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Absolutely.
Ambient temperature makes no difference to the way the VCU works.