electric fan 300tdi

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Running an electric fan constantly would be a waste and it wouldnt last long at all.
If you understand what heat soak is you will understand why a viscous is better in that respect.
Kenlowe dont rate their fans for continous operation.
Not sure what there duty cycle is but i bet its pretty low.

Based on the several land rovers i have owned, 200 no viscous needed elec fan will do fine, basic 300tdi no a/c and manual same as 200, 300tdi with a/c or/and auto stick with the viscous as it will suffer from heatsoak and will over heat, i can vouch for this, TD5 stick with the viscous as the engines are to bloody expensive!

Lynall
 
Last edited:
lynall said:
Running an electric fan constantly would be a waste and it wouldnt last long at all.
If you understand what heat soak is you will understand why a viscous is better in that respect.
Kenlowe dont rate their fans for continous operation.
Not sure what there duty cycle is but i bet its pretty low.

Based on the several land rovers i have owned, 200 no viscous needed elec fan will do fine, basic 300tdi no a/c and manual same as 200, 300tdi with a/c or/and auto stick with the viscous as it will suffer from heatsoak and will over heat, i can vouch for this, TD5 stick with the viscous as the engines are to bloody expensive!

Lynall
Click to expand...

i was hoping to use it on hills only when towing the caravan i dont think ide need it any other time it didnt have a fan at all i put the viscous on due to first time i hit a hill towing and temp went through the roof
 
ok checked the rad seems cool on one side,whats the best way to clear it as its a relativly new rad,will the simple rad flush do also which antifreeze do i use,is it just the blue glycol or other stuff
rich
 
lynall said:
If you understand what heat soak is you will understand why a viscous is better in that respect.
Lynall
Click to expand...

I understand exactly what heat soak is and fail to understand why a viscous fan is better than an electric. In fact the opposite is true. Better still would be an EWP as I regularly advocate for owners of K series engines!

For those that arent as familiar... “heat soak” refers to a raise in the engine coolant system temperature and pressure after the engine is turned off.
At this time, the combustion process is terminated. This terminates the momentum of the crankshaft, which in turn stops the turning of the water pump. As the coolant is no longer being circulated, the engine block and cylinder temperature increase for a period of approximately 3 to 10 minutes, depending on the engine design and additional components. During this time, the engine block radiates heat to the air surrounding the engine, which slowly cools the engine. However, the cooling process occurs slowly, and as a result, the temperature of the engine block transfers the heat to the coolant. The coolant temperature then increases, which in turn increases the pressure inside the coolant system. This is why the vehicle's coolant temperature gauge increases over a period of time after the engine has been turned off. (ref. http://cjbfire.com/Heatsoak.pdf)
As Heatsoak is to do with the lack of heat removal due to the sudden stopping of coolant flow, how can a viscous fan (which stops with the engine) be better than an electric fan which can be continued to be powered after shutdown. I would accept that neither is particularly good at removing heatsoak, but the electric fan has to be (marginally) better than a viscous, because it can, at least, continue to provide air cooling and prospectively thermo-dynamic cooling, which a stopped viscous fan cannot achieve.
 
I agree with what you say,but if we rewind to just before the engine is switched off,with a viscous the temp in the rad will be cooler (the viscous moves air whether locked or not) than an electric(assuming it hasen't reached switch point),so there is a greater reservoir of colder water to deal with heat soak-but as you say only the electric can switch back on and do something after key turn off
 
what mhm is trying to talk about is latent energy,but viscous is better than electric,after you turn engine off it will only get cooler because of the amount of energy created while runing couneratcs any heat soak ****
 
The Mad Hat Man said:
I understand exactly what heat soak is and fail to understand why a viscous fan is better than an electric. In fact the opposite is true. Better still would be an EWP as I regularly advocate for owners of K series engines!

For those that arent as familiar... “heat soak” refers to a raise in the engine coolant system temperature and pressure after the engine is turned off.
At this time, the combustion process is terminated. This terminates the momentum of the crankshaft, which in turn stops the turning of the water pump. As the coolant is no longer being circulated, the engine block and cylinder temperature increase for a period of approximately 3 to 10 minutes, depending on the engine design and additional components. During this time, the engine block radiates heat to the air surrounding the engine, which slowly cools the engine. However, the cooling process occurs slowly, and as a result, the temperature of the engine block transfers the heat to the coolant. The coolant temperature then increases, which in turn increases the pressure inside the coolant system. This is why the vehicle's coolant temperature gauge increases over a period of time after the engine has been turned off. (ref. http://cjbfire.com/Heatsoak.pdf)
As Heatsoak is to do with the lack of heat removal due to the sudden stopping of coolant flow, how can a viscous fan (which stops with the engine) be better than an electric fan which can be continued to be powered after shutdown. I would accept that neither is particularly good at removing heatsoak, but the electric fan has to be (marginally) better than a viscous, because it can, at least, continue to provide air cooling and prospectively thermo-dynamic cooling, which a stopped viscous fan cannot achieve.
Click to expand...

In a nut shell as the viscous is moving air all the time it will be cooling the engine not just via the rad but the engine block/head etc with the passing air flow.
This is the downfall of the electric fan, ie no cooling at slow speed.
Plus the electric cannot be as good/reliable as a viscous, ive never seen an electric rad fan on any of the trucks i work on, i think most of the vans we see are also viscous, but as i avoid small stuff like the plague i cant be 100 percent on that!
I think if you want hassle free motoring stick with the std fan.


Lynall
 
lynall said:
In a nut shell as the viscous is moving air all the time it will be cooling the engine not just via the rad but the engine block/head etc with the passing air flow.
This is the downfall of the electric fan, ie no cooling at slow speed.
Plus the electric cannot be as good/reliable as a viscous, ive never seen an electric rad fan on any of the trucks i work on, i think most of the vans we see are also viscous, but as i avoid small stuff like the plague i cant be 100 percent on that!
I think if you want hassle free motoring stick with the std fan.


Lynall
Click to expand...

I think yu misunderstand how these fans work?

A viscous fan is attached to the engine, so....
A) it only works when the engine is running.
B) the airflow is directly proportional to the engine speed, not to the cooling required.

An electric fan is ( or can be) driven independently of the engine and therefore......
A) can be turned on or off by the cooling requirements, irrespective of engine speed.
B) the airflow is controlled purely by the fan controls, so that it enables quicker warm-up periods, longer cooling (after the engine is turned off), and the option to turn it off completely if wading.

In short, an electric fan can do everything a viscous fan can do, and more. It has to be the better option.
 
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