To be honest a few people have had a crack at this without success. But I have never seen ALL the principles that have been discussed implemented.
I appreciate its down to the packaging and amount of space available. Certaintly some principles are more important than others.
Lets take shrouding. I have just looked at one manufacturers web site that suggests the difference in effectiveness between a unshrouded and shrouded fan is in the order of 40%. Then there is the fan itself that you are using. Again I expect you chose that one as it has a slim profile rather than maximum airflow. Unfortunate fact of life that the more powerfull the fan, the more current draw, the bigger the motor. Then there is the blades where the straight ones are more effective. So there might be some scope for improvement there.
Both of these isues are of course dependant on the core depth taking up the available space. So the question is which of these is more important in terms of regulating the temperature where surface area and airflow seem to be the priority.
Spal do a nice twin 280mm dual fan with integral shroud which is close to the 600X400 core size. In fact its almost the same dimensions as the V6 rad. Not cheap. I guess thats why I liked the idea of using that V6 dual fan shroud which could be modified to take either slimmer fans asuming the OE ones did not fit and were not up do the job. Of course without any dimensions its difficult to see how much space they take up. So I guess we have about 110mm (55mm for the rad core + 50mm for the fan). The shroud itself might not be very deep but clearly the compromise is the rad core depth. Is there a reason why the thread for the viscous fan couldn't be removed to gain same space?
Another solution although its not very bling is to duplicate the OE arrangement with a viscous fan and a seperate shrouded electric fan. Thats what the S6 plus used. Seem to recall the S6 C4 used a bigger viscous than say the TDi models. Both have seperate shrouds. Thats assuming the thread on the boss is the same.The supplementary electric fan is mounted on its own shroud. Again it may mean replacing the OE fan with a slimmer one more powerful one. The dimensions of depth are within a few mm so should be to hard to adapt. Indeed it migh be possible to use two of those shrouds to cover most of the radiator surface area assuming you would be going to a larger rad, close to OE sized core
Its sort of counter intuitive as to why the OE rad is not adequate when it seems to have close to the core size required. Perhaps people are using old clogged up ones or not incorporating all of the principles we have covered. As Alex as mentioned they may be improvements to have in core effeciency.
Guess you will have do do your own research and satisfy yourself in terms of cooling what are the most important considerations, including other issues outside of the cooling system such as oil temperature for example. If the issue is primarily airflow through the rad then its prudent to look at how to improve that. Basically whats we have been suggesting.
I appreciate its down to the packaging and amount of space available. Certaintly some principles are more important than others.
Lets take shrouding. I have just looked at one manufacturers web site that suggests the difference in effectiveness between a unshrouded and shrouded fan is in the order of 40%. Then there is the fan itself that you are using. Again I expect you chose that one as it has a slim profile rather than maximum airflow. Unfortunate fact of life that the more powerfull the fan, the more current draw, the bigger the motor. Then there is the blades where the straight ones are more effective. So there might be some scope for improvement there.
Both of these isues are of course dependant on the core depth taking up the available space. So the question is which of these is more important in terms of regulating the temperature where surface area and airflow seem to be the priority.
Spal do a nice twin 280mm dual fan with integral shroud which is close to the 600X400 core size. In fact its almost the same dimensions as the V6 rad. Not cheap. I guess thats why I liked the idea of using that V6 dual fan shroud which could be modified to take either slimmer fans asuming the OE ones did not fit and were not up do the job. Of course without any dimensions its difficult to see how much space they take up. So I guess we have about 110mm (55mm for the rad core + 50mm for the fan). The shroud itself might not be very deep but clearly the compromise is the rad core depth. Is there a reason why the thread for the viscous fan couldn't be removed to gain same space?
Another solution although its not very bling is to duplicate the OE arrangement with a viscous fan and a seperate shrouded electric fan. Thats what the S6 plus used. Seem to recall the S6 C4 used a bigger viscous than say the TDi models. Both have seperate shrouds. Thats assuming the thread on the boss is the same.The supplementary electric fan is mounted on its own shroud. Again it may mean replacing the OE fan with a slimmer one more powerful one. The dimensions of depth are within a few mm so should be to hard to adapt. Indeed it migh be possible to use two of those shrouds to cover most of the radiator surface area assuming you would be going to a larger rad, close to OE sized core
Its sort of counter intuitive as to why the OE rad is not adequate when it seems to have close to the core size required. Perhaps people are using old clogged up ones or not incorporating all of the principles we have covered. As Alex as mentioned they may be improvements to have in core effeciency.
Guess you will have do do your own research and satisfy yourself in terms of cooling what are the most important considerations, including other issues outside of the cooling system such as oil temperature for example. If the issue is primarily airflow through the rad then its prudent to look at how to improve that. Basically whats we have been suggesting.
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