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Old 6th November 2012, 00:16   #71
Dragrad
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Quote:
Originally Posted by SapperGB View Post
bumping this post as its getting lost and wondering if some aspects could be filtered into a sticky?
A bit too much for selective stickies although some have made it into The How To forum
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Old 6th November 2012, 20:42   #72
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Quote:
Originally Posted by SapperGB View Post
bumping this post as its getting lost and wondering if some aspects could be filtered into a sticky?
I made it a sticky when I first created it but like many threads on forums they get hijacked and go off topic unless heavily moderated or closed and the point of this thread was to simply collate useful info I used to delete all sorts of posts from it in the early days.

I guess it went so off topic or because of my resignation from the club after falling foul with a certain couple of now extremely ex management colleagues it got unstuck.

Plus a lot is probably out of date now anyway.
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Old 25th November 2012, 20:10   #73
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Posting this here cos nobody really seems to know what chemical actions take place inside a charged battery as it starts to discharge. So here it is.

Basically lead to lead sulphate and acid to water. Follow the colour scheme. The two plates end up as lead sulphate when the battery is discharged. PbSO4.

When recharged the negative plate is pure lead. Pb. The positive plate becomes lead dioxide. PbO2.

The red ++ indicates two ions and the blue = indicates two electrons.

H2SO4 is the sulphuric acid.

H2O is the water.

Pb0 is lead oxide.

The battery is shown discharging. The direction of the chemical reactions is reversed on charging.

A battery must NEVER be left in a discharged state as the lead sulphate crystals on the two plates compact over a period of several months to a solid layer and kill the battery.

Charging and discharging keeps this sulphate layer to a minimum and increases the lifespan of the battery.



Colvert.

( Look after your battery and it will look after you. Lol )

PS. Click on thumbnail and have a study of it. The colours show how the chemicals combine and what compounds they form. The coloured arrows show the order in which the reactions take place.



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File Type: jpg Battery chemical reactions.0001.jpg (135.9 KB, 635 views)
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Old 13th December 2012, 20:54   #74
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Quote:
Originally Posted by Keith View Post
Sound clip of the dreaded Manifold rattle

For reference
http://media.putfile.com/Mg-ZT-190-Vis-Fail-Noise
dead link?
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Old 14th December 2012, 17:47   #75
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dead link?
Yes it is. Just vanished !!
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Old 4th February 2013, 13:32   #76
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http://www.aronline.co.uk/blogs/fact...essay-k-series



(Try number 2. Lol )

Got it, it works this time. lol.

When you get there also click on the bit further down the page-----'WHAT MAKES IT TICK'. This gives much more detail about the 1.8 engine development.



Colvert.
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Old 26th July 2013, 08:58   #77
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Default Cooling Fan Circuit Diagrams

I modified my CDT to run a single speed fan a few years ago, and noticed that the Rover circuit diagram was incorrect, so drew these diagrams up.

The diesel engines run quite cool so will work fine with a single speed fan in the UK climate, but I wouldn't do this with the petrol engined models, as they need all the cooling they can get.

If you do fit a non standard fan the correct rated fuse must be used to protect the circuit. I fitted a 25 amp fuse that was originally used with the donor fan, but of course this may vary.



[IMG][/IMG]



[IMG][/IMG]



[IMG][/IMG]







Hope this helps.

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Old 26th July 2013, 18:52   #78
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That's a really interesting post Mike. If I get trouble with my diesel fan I'll definitely fix it up with a one speed one.


Good one


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Old 28th July 2013, 09:24   #79
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Thanks Colvert. The official Rover wiring diagram I saw for the diesel fan was incorrect as it showed the high speed relay supplying a positive voltage, when in reality it is a ground connection.
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Old 24th October 2013, 21:02   #80
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Think I'll plonk this in here. Might be handy for someone.


Rate of battery charging.----The main thing is to keep the battery temperature low. ( Around bath water temperature. ) Much hotter than this and the water content will start to get boiled off.

In the days when batteries had filler caps you could look inside to see what was happening. 20 amps for any length of time and you'd see fierce action as bubbles came up past the plates.

The regulator is there to stop this happening. Fast chargers that are some times used by garages can drastically shorten the life of batteries. ( Avoid fast chargers like the plague. )

With the latest modern batteries the fluid levels drop but can no longer be checked. Also paste can be forced out of the lead/antimony grids and fall to the bottom of the battery.

None of this does the battery any good.

RE---- Charging rates and capacity.

A batteries voltage does not change much from full to empty. Somewhere around one volt is normal unless the battery has been subjected to deep discharge.

Capacity however goes through an enormous change.

The analogy of two water tanks describes it perfectly.

Two tanks 3 feet high.

Tank 1 being a foot diameter.

Tank 2 being 10 feet diameter.

With reference to a battery the pressure in both is identical. ( Read DEPTH as VOLTAGE. )

The volume/ capacity in tank 2 is vastly greater than in tank 1 even though the depth/ voltage is identical.

Connect the tanks together and there is no flow from one to the other.

Raise the level in either tank and water will start to transfer from the higher to the lower. ( battery 12 volts---Charger 14 volts. Current starts to flow. Battery charges. )

Batteries------Around 12 volts discharged. Apply a higher voltage such as the alternator supplies ( !4.4 volts approx ) and current starts to flow into the battery increasing its capacity. ( Amount of electricity stored within it and available for work. ) During this time the battery internal voltage slowly increases and the current flow slowly decreases. The battery temperature starts to drop.

14.4 volts translates into around 5 amps roughly.

Any voltage increase above this will increase the current supply in proportion.

The higher the voltage the hotter the battery will get. ( As said above, avoid garage fast chargers like the plague. )

A discharged Diesel engine battery will take around 30 hours on a standard charger.




Colvert. ( Refer to post 73 too for a bit more info. Lol. )
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