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Old 07-22-2005, 02:01   #1 (permalink)
Fanie
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Boiling Temp of Disco 300Tdi

Hi Group

Does anyone know off hand the boiling temp of a Disco 300tdi circa '96. I
have fitted a hewitt industries engine protection system but I find the
engine temp warning coming in a little early.

I know toyota consider a cooling test to be a fail if they get within 10degC
of the boiling point of the cooling system so I would like to get a new
sender that would kick in at about the same level ie 10deg cel below system
boiling point.

regards
Stephen


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Old 07-22-2005, 09:01   #2 (permalink)
Ali
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Re: Boiling Temp of Disco 300Tdi

Well, assuming your cooling system is pressurised to 14.7 psi, (1 bar) the
boiling point will be 100 degrees. For every 1 psi over what you have now,
will raise the boiling point by 1 celcius.

Alistair


"Fanie" <fanie@checkitsystems.com> wrote in message
news:xcednX0krNqjDH3fRVn-pg@is.co.za...
> Hi Group
>
> Does anyone know off hand the boiling temp of a Disco 300tdi circa '96. I
> have fitted a hewitt industries engine protection system but I find the
> engine temp warning coming in a little early.
>
> I know toyota consider a cooling test to be a fail if they get within
> 10degC of the boiling point of the cooling system so I would like to get a
> new sender that would kick in at about the same level ie 10deg cel below
> system boiling point.
>
> regards
> Stephen
>



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Old 07-22-2005, 13:01   #3 (permalink)
Dougal
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Re: Boiling Temp of Disco 300Tdi

Ali wrote:
>
>
> "Fanie" <fanie@checkitsystems.com> wrote in message
> news:xcednX0krNqjDH3fRVn-pg@is.co.za...
>
>>Hi Group
>>
>>Does anyone know off hand the boiling temp of a Disco 300tdi circa '96. I
>>have fitted a hewitt industries engine protection system but I find the
>>engine temp warning coming in a little early.
>>
>>I know toyota consider a cooling test to be a fail if they get within
>>10degC of the boiling point of the cooling system so I would like to get a
>>new sender that would kick in at about the same level ie 10deg cel below
>>system boiling point.
>>
>>regards
>>Stephen
>>

>
> Well, assuming your cooling system is pressurised to 14.7 psi, (1 bar) the
> boiling point will be 100 degrees. For every 1 psi over what you have now,
> will raise the boiling point by 1 celcius.
>
> Alistair >


A little expansion of Alistair's explanation may help.

At a 'normal' atmospheric pressure of 14.7 psi, (1 bar), water will boil
in the open at 100 deg C (If you live at 5000 ft the boiling point will
be somewhat lower.)

Engines run with pressurised cooling systems - typically either 7, 13 or
15 psi higher than this 14.7 psi. Using Alistair's 1 degree for each 1
psi above normal atmospheric pressure, water in a 13 psi system will
boil at about 113 deg C

Most cooling systems, however, are not filled with pure water but an
antifreeze/water mixture. This itself has an elevated boiling point
compared to pure water. A 50/50 ethylene glycol/water mixture boils at
around 106 deg C at normal pressure and at around 125 deg C with a 13
psi overpressure.

This 125 deg C figure is probably what Stephen was looking for and comes
with all the usual disclaimers as to its accuracy. Check the numbers
yourself! The 300TDi, I think, normally runs with a 15 psi pressure cap
so there is already a margin of safety in the numbers that I have quoted.

(There are many antifreeze manufacturers' sites on the internet which
carry this sort of information. This is typical:
http://www.eetcorp.com/antifreeze/antifreeze-faq.htm
Try a search including boiling point, antifreeze and pressure)
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Old 07-22-2005, 14:01   #4 (permalink)
Dougal
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Posts: n/a
Re: Boiling Temp of Disco 300Tdi

Dougal wrote:

> Ali wrote:
>
>>
>>
>> "Fanie" <fanie@checkitsystems.com> wrote in message
>> news:xcednX0krNqjDH3fRVn-pg@is.co.za...
>>
>>> Hi Group
>>>
>>> Does anyone know off hand the boiling temp of a Disco 300tdi circa
>>> '96. I have fitted a hewitt industries engine protection system but I
>>> find the engine temp warning coming in a little early.
>>>
>>> I know toyota consider a cooling test to be a fail if they get within
>>> 10degC of the boiling point of the cooling system so I would like to
>>> get a new sender that would kick in at about the same level ie 10deg
>>> cel below system boiling point.
>>>
>>> regards
>>> Stephen
>>>

>>
>> Well, assuming your cooling system is pressurised to 14.7 psi, (1 bar)
>> the boiling point will be 100 degrees. For every 1 psi over what you
>> have now, will raise the boiling point by 1 celcius.
>>
>> Alistair >

>
>
> A little expansion of Alistair's explanation may help.
>
> At a 'normal' atmospheric pressure of 14.7 psi, (1 bar), water will boil
> in the open at 100 deg C (If you live at 5000 ft the boiling point will
> be somewhat lower.)
>
> Engines run with pressurised cooling systems - typically either 7, 13 or
> 15 psi higher than this 14.7 psi. Using Alistair's 1 degree for each 1
> psi above normal atmospheric pressure, water in a 13 psi system will
> boil at about 113 deg C
>
> Most cooling systems, however, are not filled with pure water but an
> antifreeze/water mixture. This itself has an elevated boiling point
> compared to pure water. A 50/50 ethylene glycol/water mixture boils at
> around 106 deg C at normal pressure and at around 125 deg C with a 13
> psi overpressure.
>
> This 125 deg C figure is probably what Stephen was looking for and comes
> with all the usual disclaimers as to its accuracy. Check the numbers
> yourself! The 300TDi, I think, normally runs with a 15 psi pressure cap
> so there is already a margin of safety in the numbers that I have quoted.
>
> (There are many antifreeze manufacturers' sites on the internet which
> carry this sort of information. This is typical:
> http://www.eetcorp.com/antifreeze/antifreeze-faq.htm
> Try a search including boiling point, antifreeze and pressure)


I should probably add that the safest course of action is to assume a
water only system fill. An alarm setting that assumes an antifreeze
presence will not have gone off when a water only system has already boiled.
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Old 07-23-2005, 06:01   #5 (permalink)
Marc Draper
Guest
 
Posts: n/a
Re: Boiling Temp of Disco 300Tdi

In message <xcednX0krNqjDH3fRVn-pg@is.co.za>, Fanie
<fanie@checkitsystems.com> writes
>Hi Group
>
>Does anyone know off hand the boiling temp of a Disco 300tdi circa '96. I
>have fitted a hewitt industries engine protection system but I find the
>engine temp warning coming in a little early.
>
>I know toyota consider a cooling test to be a fail if they get within 10degC
>of the boiling point of the cooling system so I would like to get a new
>sender that would kick in at about the same level ie 10deg cel below system
>boiling point.




Many respected TDI engine remanufacturers put heat sensitive stickers on
their engines. They will not honour under warranty anything that is
taken over 95 degrees.
--

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