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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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2004/10/28 11:35
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actually running a car with normal sized radiator hoses and no thermostat will make it overheat coz the water travels through the radiator too fast to do anything, you need some kinda restriction to make it stay in the radiator long enough to cool

Posted on: 2009/1/15 3:03
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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pigdog r you saying a stock car with out a thermostat will run hotter ? has i would have to beg to differ on that

Posted on: 2009/1/15 3:13
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perth airport parking
Datsun 1200 ute A14
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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Pigdog is correct,a restrictor of some sort weather it be a thermostat or a taylor made jobbie or even a thermostat with it's guts missing is needed to slow the coolant down and allow it some time to be spent in the radiator out in the air flow to cool off before it gets pumped back in.Failing to do this means the coolant never cools and gets whiped back into the engine at the same temp it left,building more and more heat on each cycle.

Now in a chilly environment a thermostat is a must as it holds the coolant within the engine until the correct temp is reached,then releases it to the radiator and so the cycle is repeated over and over until an even temp is achieved throughout the whole system.
So in summary,it's best to use a thermostat in all conditions and let the physics do the job intended.
Might i suggest you look at a 15 pound radiator cap if the old one is a bit sus.
Cheers

Posted on: 2009/1/15 3:59
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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hmmmm, allways made my cars run cooler maybe the rads where a bit block'd

guess most of the time you only remove a thermostat coz the coolin system is a bit old/block'd so then it will run cooler

Posted on: 2009/1/15 4:19
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perth airport parking
Datsun 1200 ute A14
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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If you refer to my second paragraph,in a cooler environment(not that it's too cool where you are)or if you have a largish or multi core radiator with lots of volume...and you are moving along the faster you are pushing air across the radiator the colder it can get,and it is quite possible the engine is unable to make enough heat to bring it up to correct temp,but then the opposite applys when the ambient is higher.

As a matter of interest,an actual air temperature of 0 deg celsius,with a wind speed of 64km/h gives an effective temperature of -37 deg celsius over the face of our intercoolers and radiators

Posted on: 2009/1/15 4:38
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Re: removing front mount for cooling issues....
Home away from home
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i thought this was the case. i will take off the thermostat and see what i find. thanks for agreeing pig dog and bert.... thought i was right but didn't want to satart an arguement..... hahahahah cheers

Posted on: 2009/1/15 5:10
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A15 1200 ute, 77 mini -b16a honda vtec project
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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2008/10/10 22:02
From Melbourne Australia (and likely under the car)
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A big reason to keep the thermostat in there is that it preloads the water pump and helps prevent any cavitation or aeration. Secondly, it increases the water pressure (at higher rpm, when the pump is moving) in the block/head since the thermostat acts as a restriction. This prevents steam pocket formation and also improves the heat transfer properties of the coolant.

This little tid bit of info might shed some light on why there's been a few traumatic stories (admittedly none I'm aware of on this forum) of peoplle fitting electric water pump conversions (some of which mandate the removal of the thermostat - ostensibly because they use pump speed to regulate temp, but far more likely because their pumps just can't push any water against a restriction and develop this preload/pressure in the block/head.

It's pretty easy to see this effect in practice, with the motor warmed up and the thermostat being known to be open, if you lift the revs to about 3500 you'll see the water level drop in the radiator, since the water in the block is under higher pressure/slightly more dense (water of course isn't exactly compressible, but there are trace amounts of free O2 in there that are, among other things.

Another really odd thing - if you manipulate the surface tension of water you can improve the above effects. You could get the 'water wetter' or other expensive stuff, or just use a couple of drops (and I seriously mean just a couple of drops) of liquid soap in there.

----

Aside from these 'internal' shenanigans, I'd suggest a good long look at the fan shrouding. Air will take the easiest course possible, and without enough shrouding to force the air to go through the core and past a 'pulling' fan, you'll just get it pulling air from practically everywhere else. I've seen factory installs where a fan shroud was damaged in a crash, and people chased their tails with bigger rads with more rows, colder thermostats, pulling the head and running 2 stacked head gaskets - none of which did stuff all, and then a replacement shroud from a wrecker and it was 'all good' once again. If your thermo fans don't have one, or one that is tightly sealed around the core, look there first imho.

Posted on: 2009/1/15 6:08
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John McKenzie
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Re: removing front mount for cooling issues....
Home away from home
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2008/1/30 10:17
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your problem is airflow as it only occurs when car is stationary

1) use a thermostat.always.
2)electric fans are ####e(unless factory fitted)
3)air must go through not around radiator.good shrouding is a must.sometimes a piece of gaffer tape will yield a better results than a $1000 radiator because the airflow is the problem,not the water.

btw water wetter works! approx 5 - 10 deg c but get the system right first
dazza

Posted on: 2009/1/15 11:36
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Re: removing front mount for cooling issues....
No life (a.k.a. DattoMaster)
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2003/9/2 6:01
From SE Melbourne
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Are your thermofans turning on when the car gets hot?

Let it idle in the driveway for 10min and see if the fans turn on.

Posted on: 2009/1/16 0:23
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Mildman, Datsunless
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