Rear mounted Radiator

[rob-mu]

Just a few questions on doing this as I can't find much on the net about it.If i run a oil cooler as well should i leave that in the front or take it back to the deck also?.If i run a decent electric water pump is there any harm in leaving the belt driven one in?.The electric pump can do 110lpm
Thanks,Rob

[haynzy]

should be sweet without the lecky pump although it would come in handy, sometimes too much water flow can be detrimental as it doesnt spend enough time in the radiator to cool it down.

[flyingbrick]

doesnt spend enough time in the radiator to cool it down.

Sorry- this is false.

It spends less time in the radiator to cool down.....but it also spends less time in the engine to heat up. Its all relative

[haynzy]

doesnt spend enough time in the radiator to cool it down.

Sorry- this is false.

It spends less time in the radiator to cool down.....but it also spends less time in the engine to heat up. Its all relative

explain why if the thermostat is removed in my hilux it runs 10deg hotter?

[rangimotors]

doesnt spend enough time in the radiator to cool it down.

Sorry- this is false.

It spends less time in the radiator to cool down.....but it also spends less time in the engine to heat up. Its all relative

have you tried it? i think you will find that haynzy is correct depending where you have your sensor for water temp it may appear that the water is staying nice and cold when its flowing fast but it works the other way as well, the water needs to travel slow enough to take the heat from the engine and slow enough to cool that heat in the radiator. Same principle goes when people say just take out the thermostat, it (talking about the engine NOT the water temp) will run hotter with no thermostat than it will with a correct thermostat or one with a hole drilled in the side to increase flow but still have it restricted.

[flyingbrick]

Its not much different to someone saying "your radiator will stay cooler if you drive slower- because te air will be moving slower over the radiator and so will be able to absorb more heat"

I'm happy to be proven wrong- I'm absolutely no genius when it comes to physics (or anything for that matter ). This discussion comes up all the time- usually when people are discussing LPM of a w2a intercoolers pump.....

but again- if the water is losing less heat by moving faster through the radiator then its also going to be gaining less heat because its moving faster around the warm IC core.

Tomorrow could be the day I am proven wrong on this (its a little late to expect much tonight)

[Sadam_Husain]

but again- if the water is losing less heat by moving faster through the radiator then its also going to be gaining less heat because its moving faster around the warm IC core.

Thats correct and the whole idea of the water in the block is to obsorve as much heat as possible out of the engine and transfer it into the radiator so it can obsorve the heat back out of the water to go back into the engine to repeat the cycle

[flyingbrick]

but again- if the water is losing less heat by moving faster through the radiator then its also going to be gaining less heat because its moving faster around the warm IC core.

Thats correct and the whole idea of the water in the block is to obsorve as much heat as possible out of the engine and transfer it into the radiator so it can obsorve the heat back out of the water to go back into the engine to repeat the cycle

water starts absorbing heat from the block the instant its in there. It doesn't have to sit around for a specified amount of time before it starts drawing heat away from the steel.

Put your hand in two freezing cold rivers. One river is fast, one is slow. Your hand is not going to get colder in the slow moving river simply because each water molecule has longer on your hand to remove any heat.

Sorry if i read your post wrong

[Sadam_Husain]

Sorry if i read your post wrong

[rob-mu]

And the part about oil cooler?

[Sadam_Husain]

Theres a bit of info here Rob, I think theres a few other threads worth searching out in the archives


http://www.offroadexpress.co.nz/Forums/ ... 22&t=17097

[rob-mu]

Cheers bud,I had a good search around.Must of missed that one

[vvega]

doesnt spend enough time in the radiator to cool it down.

Sorry- this is false.

It spends less time in the radiator to cool down.....but it also spends less time in the engine to heat up. Its all relative

explain why if the thermostat is removed in my hilux it runs 10deg hotter?

pump cavatation :d

sorry bro just been a arse

[Heath]

Dont some of these lecky pumps have a thermostat in them so the pump speed is temp dependant?

[niblik]

the latent temp of the engine heat with continual operation and the delta T (temperature difference) between that and the radiators cooled water is what will cause cooling and overall temp control and management in your engine too.. sure the fast slow river example is all good, if your engine had a continually refreshed source of cool water? eventually, the longer the engine would run, the hotter the water would get till it reached its maximum absorption rate (not enough temp difference between incomin water and engine temp) because it is getting supplied with a constant amount of heat and thus would need adequate 'temp droppin' time in the radiator.. either get a bigger radiator for more effective cooling or slow it to get that adequate cooling effect..

to me its a fine line of what works really..

and the end of the day, i know what i'm tryin to say but its hard to put it on here.. 'me no unnerstan' styles..

also on the movin the liquid thing, dieselboy was sayin that the water is a non compressable and should be moved around in the rear mount radiator application ok, so all good news there fer yee..

[darinz]

heat transfer happens best when the temp difference is the greatest. As an extreme example, put a red hot piece of steel into a bucket of water, almost instantly it looses most of it's heat. BUT how long does it take to cool it to the same temperature as the water? A loooooooong time.
Take this same concept and apply it to a cooling system. What you want to do is get the water quickly into and out of where it chages temp. Then quickly move it around again as that way it is more efficient at removing heat.
A thermostat is about keeping the engine hot and so slowing the water flow down to decrease the cooling.

The theory about intercoolers is that if they are too big you don't get enough surface area contact to allow efficient heat transfer. It isn't about speed of flow. Except the w2a water pump size arguement that is exactly the same as this one.

Go here for a way better explanation!
http://www.pirate4x4.com/tech/billavist ... sRadReview

[flyingbrick]

Thanks Darin. Will read

[chrome]

sorry to hijack but on a radiator fan setup and the fan cables are a four pin plug what are all the wires? two will run it but above you mention a thermostat, is this part of that?

[new2zukes]

hi might be a 2 speed one one will be for just idleing and when thermostat gets over certain temperature it will kick into double speed. as for thermostat that should be attached to the outside of the radiator with a 2 pin plug on it. hope this helps.

martin