Koyo N-FLO (dual pass) radiator question
08-24-10, 01:40 PM
#52
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Aside from fitment, I think people really need to consider the additional stress introduced to the water pump with multiple pass radiators. There's a bunch of articles that state the same thing but I'll quote part of one:
"This also presents an increased load to the water pump, which means using a dual-pass radiator demands a better water pump if the system is to take advantage of the dual-pass concept." which was taken from here: http://www.carcraft.com/howto/ccrp_0...em/basics.html
Also, the Koyo N-Flo radiator is a triple pass (hence the name "N-Flo" since the flow of the coolant follows the shape of an "N") which increases the load on the water pump even more than a dual pass! Our cars already have a poorly designed water pump, PLUS the water pump pulley tends to slip already if you eliminated the air pump, so I personally would choose to stay away from the "N-Flo".
One more thing. For street cars, there's another drawback for multiple pass radiators. Another quote: "Dual-pass radiators work efficiently at high speeds in certain race-prepped systems, but do so at a cost of increased load on an engine's water pump, and inefficient low-speed cooling capacity, which can raise pressure and temperature to higher-than-desired levels", taken from here: http://www.importtuner.com/tech/impp...sis/index.html. Street driven FD's can see a lot of low speed situations so IMHO, it's better to have a single pass radiator for the street.
"This also presents an increased load to the water pump, which means using a dual-pass radiator demands a better water pump if the system is to take advantage of the dual-pass concept." which was taken from here: http://www.carcraft.com/howto/ccrp_0...em/basics.html
Also, the Koyo N-Flo radiator is a triple pass (hence the name "N-Flo" since the flow of the coolant follows the shape of an "N") which increases the load on the water pump even more than a dual pass! Our cars already have a poorly designed water pump, PLUS the water pump pulley tends to slip already if you eliminated the air pump, so I personally would choose to stay away from the "N-Flo".
One more thing. For street cars, there's another drawback for multiple pass radiators. Another quote: "Dual-pass radiators work efficiently at high speeds in certain race-prepped systems, but do so at a cost of increased load on an engine's water pump, and inefficient low-speed cooling capacity, which can raise pressure and temperature to higher-than-desired levels", taken from here: http://www.importtuner.com/tech/impp...sis/index.html. Street driven FD's can see a lot of low speed situations so IMHO, it's better to have a single pass radiator for the street.
08-24-10, 01:49 PM
#53
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I personally used single pass koyo , its a POS in my opinion , now I use a N flow and it absolutely phenominal ! but I also use an electric Mizerie water pump.
08-24-10, 02:17 PM
#54
Aside from fitment, I think people really need to consider the additional stress introduced to the water pump with multiple pass radiators. There's a bunch of articles that state the same thing but I'll quote part of one:
"This also presents an increased load to the water pump, which means using a dual-pass radiator demands a better water pump if the system is to take advantage of the dual-pass concept." which was taken from here: http://www.carcraft.com/howto/ccrp_0...em/basics.html
Also, the Koyo N-Flo radiator is a triple pass (hence the name "N-Flo" since the flow of the coolant follows the shape of an "N") which increases the load on the water pump even more than a dual pass! Our cars already have a poorly designed water pump, PLUS the water pump pulley tends to slip already if you eliminated the air pump, so I personally would choose to stay away from the "N-Flo".
One more thing. For street cars, there's another drawback for multiple pass radiators. Another quote: "Dual-pass radiators work efficiently at high speeds in certain race-prepped systems, but do so at a cost of increased load on an engine's water pump, and inefficient low-speed cooling capacity, which can raise pressure and temperature to higher-than-desired levels", taken from here: http://www.importtuner.com/tech/impp...sis/index.html. Street driven FD's can see a lot of low speed situations so IMHO, it's better to have a single pass radiator for the street.
"This also presents an increased load to the water pump, which means using a dual-pass radiator demands a better water pump if the system is to take advantage of the dual-pass concept." which was taken from here: http://www.carcraft.com/howto/ccrp_0...em/basics.html
Also, the Koyo N-Flo radiator is a triple pass (hence the name "N-Flo" since the flow of the coolant follows the shape of an "N") which increases the load on the water pump even more than a dual pass! Our cars already have a poorly designed water pump, PLUS the water pump pulley tends to slip already if you eliminated the air pump, so I personally would choose to stay away from the "N-Flo".
One more thing. For street cars, there's another drawback for multiple pass radiators. Another quote: "Dual-pass radiators work efficiently at high speeds in certain race-prepped systems, but do so at a cost of increased load on an engine's water pump, and inefficient low-speed cooling capacity, which can raise pressure and temperature to higher-than-desired levels", taken from here: http://www.importtuner.com/tech/impp...sis/index.html. Street driven FD's can see a lot of low speed situations so IMHO, it's better to have a single pass radiator for the street.
Dual pass or triple pass depends on what you think the water is passing, yes it passes through 3 areas of the radiator but only passes through 2 seperators/gates/doors. Koyo says it's a dual pass
What do you mean by POS? What were the differences in temps between regular and n-flo. You're talking day and night difference, I find that hard to believe (water pumps and rest of the cooling system being the same).
08-24-10, 05:02 PM
#55
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Single pass goes from top end tank > bottom end tank.
Dual pass goes from top end tank > bottom end tank > top end tank.
Triple pass should logically then go from top end tank > bottom end tank > top end tank > bottom end tank, which is what the N-Flow does. If Koyo calls the N-Flow a dual pass, how do you differentiate between the design of a traditional dual pass and Koyo's idea of a dual pass when there clearly is a difference?
Also, with a traditional dual pass, when coolant reaches the radiator, coolant is forced to flow at a rate that is 100% higher compared to a single pass radiator of the same overall size (because it needs to travel twice the distance through half the number of rows).
In the case of the Koyo N-Flow, when coolant reaches the radiator, coolant is forced to flow at a rate that is 200% higher compared to a single pass radiator of the same overall size. (Because it needs to travel 3 times the distance through 1/3 the amount of rows) This is another clear difference between a traditional dual pass radiator and Koyo's N-Flow, which is why I tend to think of the Koyo N-Flow as a triple pass radiator.
05-25-11, 01:45 AM
#56
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I am having a hard time fitting my M2 Large SMIC with my Koyo radiator. The IC ducting is being pressed upward by the thicker radiator. I will see if the issue is the lower brackets but I may have to do some cutting of the fan braces or ducting. Interesting the radiator seems to fit with some cars but not others.
01-03-18, 03:39 AM
#58
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I know this is a really old post but still for someone new, looking into understanding a bit better what his cooling options are, this is still very helpful.
Thanks,
Kostas.
Thanks,
Kostas.
