The UK/IERE Land Rover Owner Daily Digest

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Date: Sat, 24 Feb 1996 08:38:23 GMT
From: Gerald Tan <gtan@bbchw.demon.co.uk>
Subject: Re: Missing thermostats

If:
1. I finish all my other chores this weekend and
2. If I could find my "Steam Tables" to do the calculations

I will try and come up with some mathematical representations of what actually 
happens....but don't hold your breath. 

Gerald.
-- 
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| My own opinions, not those of my employer!    |

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Date: Fri, 23 Feb 1996 17:29:10 +0000
From: Ian Robinson <ian@fourx4.demon.co.uk>
Subject: Re: missing theremostats

In message <825083502.9082.0@vrsolns.demon.co.uk>, Mike
<MIKE@vrsolns.co.uk> writes
>I am afraid I do not understand nor accept the pseudo-scientific 
>"theory" which has been put forward.

I can accept the logic that was being put forward here.

>As all qualified engineers know, theory is always accompanied by some 
>mathematics and if I can find some time shortly I will come up with 
>some.

Trouble is there aren't too many qualified engineers out there sorting
out Land Rover's without thermostats at 20 per hour garage charges so
we put our trust in the fact that Land Rover have spent millions in R&D
over the years and if they say their vehicle should have a stat I see
little point in argueing
>In the meantime I will leave you all a few thoughts to ponder:
>The temperature rise of the coolant due to passing through the engine 
>is inversely proportional to the flow rate.

And presumably the temperatures that it meets on the way. So I guess
that you'll be taking account of the different fuel, the methods of
combustion, the method of fuel introduction, the thickness of cylinder
liner walls etc.
>The temperature profile of the coolant as it passes along the 
>radiator is approximately an exponential decay aiming for ambient. 
	 [ truncated by lro-digester (was 6 lines)]
>The flow rate determines how much of this decay is present before the 
>coolant exits the radiator.
I think this supports the agruement that was being put forward to say
that you want quick flow around the engine so that a given volume of
water doesn't get too hot and a slow flow around the radiator so that
it's got pleanty of time to cool, therefore don't remove the stat.

'init ?
 
>Temperatures which have been mentioned, around 100 degC into the 
>radiator, are high for normal engines. the coolant only experiences 
	 [ truncated by lro-digester (was 6 lines)]
>cylinder head and it is for this reason that the system is 
>pressurised.
By this pseudo-scientific "theory" then surely a normal engine wouldn't
require a radiator at all because you are saying that the 100' is a max
and we all know that water at 9 or 15 psi doesn't boil at 100'
 
>Further complications arise due to the effects of the by-pass system 
>which provides hot water for the vehicle interior heater, on some 
>systems for heating inlet manifolds and on occasions for oil coolers. 
                                
Not for oil coolers on Land Rovers.

>Perhaps the reason for restriction plates is to ensure an adequate 
>flow through the by-pass. 
>systems for heating inlet manifolds and on occasions for oil coolers. 
Dunno. 

>It should be noted that if any particular molecule of water is in a 
>particular region for a shorter time it is there more often!
>systems for heating inlet manifolds and on occasions for oil coolers. 
Hmmm, unless slowed down on it's way back there.

>Judging by some of the addresses, there should be some engineer, 
>physicist or mathematician out there who can come up with an equation 
>linking coolant temperature to flow rate - in the steady state, lets 
>not worry about delays and transients.

Let's not worry about it too much. When they are as Land Rover designed
them they work quite well in all sorts of ambients !

Enjoys your sums, I'm off to fix one that doesn't know it's got 8 pots.
Now there's a problem !

Regards, Ian
                Forest Landrovers' 4 x 4 Centre
                Royal Forest of Dean, Glos, UK
                +44 (0)1594 822606/(0)402 000132

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From: smitha@mail.CandW.lc
Date: Sat, 24 Feb 1996 17:08:11 -0500
Subject: 300 Tdi fuel filter

Help! Can anyone tell me the part number for the fuel filter replacement 
for the 300 Tdi? What I have is labelled AEV 2147L, on the LR box.
Many thanks
Allan Smith
St. Lucia

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From: smitha@mail.CandW.lc
Date: Sat, 24 Feb 1996 17:44:15 -0500
Subject: Instrument access

Many thanks to the person who sent the suggestion for getting at 
instruments - it worked a treat, but I managed to lose the message after 
reading so couldn't respond directly.
Allan Smith
St. Lucia

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