Working temp range LC100
Submitted: Tuesday, Aug 18, 2009 at 22:30
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viz
Last weekend I installed an Engine Watchdog temperature sensor - good idea I think if you want to have some backup protection in case of a holed radiator or hose - the standard temperature sensor in the motor will not tell you if the
water level drops suddenly. Ruined a good V8 that way once...
While easy to fit, it is a bit clumsy to mount - could be a smaller unit. It seems to be quite accurate and the principal behind it seems at first glance to be sound. We will see shortly, once we hit the sand duns of the Simpson...
Question for you tech minded folks out there: what is the working temperature of a LC105 petrol 4.5? At what temp do you need to be concerned? There is an alarm on this unit and I am wondering what to set it to - I did a fang around the block and got the temp up to 80ºC, which seemed reasonable...
viz
Reply By: Member - Mike DID - Tuesday, Aug 18, 2009 at 22:41
Tuesday, Aug 18, 2009 at 22:41
Where did you mount the Temperature Sensor ?
It has to be mounted so that it still gets the heat from the Engine if the
water level drops.
AnswerID:
379531
Follow Up By: viz - Wednesday, Aug 19, 2009 at 05:27
Wednesday, Aug 19, 2009 at 05:27
I mounted it on a thermostat housing bolt, avoiding as much as possible other heat sources.
viz
FollowupID:
646899
Reply By: Member - Graham H (QLD) - Tuesday, Aug 18, 2009 at 22:43
Tuesday, Aug 18, 2009 at 22:43
My diesel runs at 76-83 deg depending on how hard its pushed.
Even towing it doesnt get much hotter.
AnswerID:
379532
Follow Up By: viz - Wednesday, Aug 19, 2009 at 12:31
Wednesday, Aug 19, 2009 at 12:31
Well there is a benchmark that I can follow, albeit diesel (
mine is petrol). Thanks for that.
viz
FollowupID:
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Follow Up By: Member - Amy G (SA) - Wednesday, Aug 19, 2009 at 12:52
Wednesday, Aug 19, 2009 at 12:52
Same operating temp range on an Engine Watchdog for my diesel too.
FollowupID:
646934
Follow Up By: mowing - Wednesday, Aug 19, 2009 at 18:38
Wednesday, Aug 19, 2009 at 18:38
Graham, Does your EGT gauge correspond with the temp alarm on the block. i.e. the EGT goes up in line with the block temp. Nothing scientific, just curious.
Regards
Mark
FollowupID:
646961
Follow Up By: Member - ross m (WA) - Wednesday, Aug 19, 2009 at 20:17
Wednesday, Aug 19, 2009 at 20:17
I dont have an EGT ,but I have the Watchdog. It definately goes up if you abuse the pedal but I doubt its as spontaneous as an EGT.
I have the sensor mounted to the coolant outllet bolt closest to the timing belt on a 1HZ toyota diesel.
It too sits around the 75-85c range. Going down big hills sees it drop off to 66c and heavy sand driving in summer gets it too 95c
FollowupID:
646980
Reply By: Member - Mike DID - Tuesday, Aug 18, 2009 at 22:46
Tuesday, Aug 18, 2009 at 22:46
The Thermostat is designed to keep the
water at a constant temperature despite the varying heat output from the engine as the load varies.
Once the
water temperature rises above the regulated temperature, it's an indication that the cooling system can't cope with the amount of heat being produced and you have to reduce workload.
You're best off monitoring the temperature with your engine and your temperature sensor position and seeing what's the maxiumum it rises to under normal conditions - if rises above that, it's time take action.
AnswerID:
379534
Reply By: Rockape - Wednesday, Aug 19, 2009 at 09:52
Wednesday, Aug 19, 2009 at 09:52
I have my alarm set at 210 degrees, which is way less than the boiling point of the coolant.
Have a good one
AnswerID:
379554
Follow Up By: Member - Graham H (QLD) - Wednesday, Aug 19, 2009 at 10:51
Wednesday, Aug 19, 2009 at 10:51
Most modern temp gauges use celsius which reaches boiling point at 100c
That is why I said
mine runs at about 80c
Makes it easier if we all talk the same language.
FollowupID:
646921
Follow Up By: Rockape - Wednesday, Aug 19, 2009 at 11:16
Wednesday, Aug 19, 2009 at 11:16
Graham,
My gauge has both a celsius and Fahrenheit scale, should have said my alarm is aet at 99c
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Follow Up By: viz - Wednesday, Aug 19, 2009 at 12:35
Wednesday, Aug 19, 2009 at 12:35
Uhmm farenheit, farenheit - which century was that??? ;)
(Gets out the conversion calculator)
99ºC. Thanks!
Water under pressure has a different boiling point, so the boiling point of
water in the radiator would be...... ??? What pressure is that cap - night have to go down to the garage again and have another look.
viz
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Follow Up By: Member - Graham H (QLD) - Wednesday, Aug 19, 2009 at 14:38
Wednesday, Aug 19, 2009 at 14:38
Ha ha Now you have your calculator out heres a calculation
One car i had the cap was 13lb and its boiling point was approx 236F.
So a conversion will give us ??????
FollowupID:
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Follow Up By: viz - Wednesday, Aug 19, 2009 at 20:18
Wednesday, Aug 19, 2009 at 20:18
You're baaaad! Another Fahrenheit man
236ºF = 113ºC
For the sake of the exercise (had to hit the books again)
Boyle's Law: P1/T1=P2/T2; Units: ºK and Bar
At 113ºC gives 20psi give or take a 0.p or two. The cap should have blown its top.
13lb you say???
viz
FollowupID:
646981
Follow Up By: Member - John R (QLD) - Wednesday, Aug 19, 2009 at 21:08
Wednesday, Aug 19, 2009 at 21:08
Sorry viz, Boyle's Law only applies to gases, not the boiling point of
water. What you need is a table of boiling points of
water at different external pressures (remembering that the cap pressure is additional to normal atmospheric pressure, a bit over 14 psi). So a 13 psi cap would result in a total max pressure of about 27 psi, at which pressure
water boils at 118C (244F) according to my reference book.
Cheers, John
FollowupID:
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Follow Up By: viz - Wednesday, Aug 19, 2009 at 21:29
Wednesday, Aug 19, 2009 at 21:29
:(
I was hoping that someone would not come up with that. I had a look at those tables, my eyes crossed so I decided it was easier to treat it as a gas (- I think I should have referred to Gay-Lussac rather than Boyle).
viz
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