ifloochies
Well-Known Member
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Have you considered the current draw of those fans when they kick in and the load it would put on the alternator?
50A sounds a bit low? Heated screen 35-40A alone! Rear heated screen, another 15-20A for all the lights etc etcThe load on the alternator is not a problem cos the average load of a Td5 is 50A tops so an extra 35-40 is not a killer for a 120A generator, only the CFM matters and when i said 2500 minimum i meant a normal UK weather, in warmer regions where the outside temp goes often above 30*C at least 4000 is needed(that's about the viscous fan's performance)
Surely the cowel restricts airflow massively when the fans arent running.the viscous isnt coweld and surely 2x220w fans outperform the viscous
It isn't really a gauge, not in the same sense as older cars. Think of it as more like 3 lights:No not at all its just something I've seen. I may look at duel fans with 4500cfm then set up on different stats to come on in stages.
I diddnt know there was only 3 levels. Mine is normally at the lowest then goes up to halfway when being worked in heat.
Ill get a gauge sorted for it when I get the fans!
I'm already getting an egt gauge because of you! And actually your the reason I'm getting a intercooler to bring my egts down a touch to try prolong its life!
I'm not up on the TD5, but as long as the electric fans move more air than the engine driven fan, in theory it should be ok with some caveats, (see below).Do you think 2 electric fans is no good still.
Removing the fan will make no difference to the rotating mass of the engine. Maybe if it were a light weight, revvy petrol engine sure, but a large, heavy, slow turning, slow accelerating diesel, no there's no noticeable difference removing 3Lb of fan.I was also thinking there is basically a lump with vairbleb restriction from the fan stuck on the crank and in my previous life In making things fast the lighter crank rods etc the better. I'm not trying to make it fast but I thought it would help the engine
A viscous linked engine driven fan is an efficient way to cool an engine. An engine fan is using power directly from the engine, i.e. no other losses in the system, except a bit of belt drag. Now consider an electric fan, with an equivalent air flow rate. You need to generate the energy (electrical) often from the same belt as the mechanical fan. Generation of electric creates a loss in energy conversion, then you have to feed that electric energy to the fans(more losses in the wiring), which then power electric motors in the fans (again more losses), effectively cancelling out any potential benefits to using them. The only reason to use electric fans, is to aid warm up times, when it's very cold (there's no increased airflow over the engine), or to overcome some inherent design error made by the vehicle manufacturer.I may look at duel fans with 4500cfm then set up on different stats to come on in stages
Of course. A turbo is air and oil cooled, although some are also water cooled too.Does the viscous fan also aid air flow around the wider engine bay i wonder? Helping disperse heat from manifold/turbo?
Does the viscous fan also aid air flow around the wider engine bay i wonder? Helping disperse heat from manifold/turbo?
No not at all its just something I've seen. I may look at duel fans with 4500cfm then set up on different stats to come on in stages.
So is that 4500cfm for just one fan, or is each fan quotes at 2250cfm ? if so putting two fans together does not increase the maximum airflow of the fans.
When side by side they are pulling there own air through the rad so the volume is
So if you have a fan that pushes 2250cfm in a theoretical, no resistance situation, putting two of them together will still only push 2250cfm.
What stacking can do though is help overcome resistance to the fan.
It is common practice among AC/water coolers to stack fans to help overcome the resistance of the radiator that the fans are blowing air through.
Much the same with sound, 100db sounder plus another 100db sounder doesn't make it 200db.
I assumed that the fans would be side by side as they are in vehiclesI agree what you are saying and that is true if the fans are on top of each other but next to each other. They can both pull 2250cfm throuh their own section of radiator
No it isn't, the air flow is still the same which is the capacity of the fan. You confused with flow and pressure.If they are side by side then they do have a joint airflow of 4500
You have mistake with the quantity of the water and air there's a difference.A bucket of water... put one 5lpm pump in it
A second bucket of water the same size...put 2 5lpm pumps in it
Wich one empties first?
Swap the water for air and the pumps for fans
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