E55 intercooler pump
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Joined: Sep 2014
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Radiators need a specific "Dwell time" of their cooling fluid to release its heat. They are specific to each and every set up. There are maths involved.
No engineering degree (yet)
But this is how I understand the water to air issue being discussed;
The charge cooler isn't usually the problem. (cooler core above the motor in the intake) If cold water (coolant) always flow through it fast as hell, it will cool the charge air very well..(relative only to its size) This is NOT the problem area when considering pump speeds and flow.
It is the "radiator" (heat exchanger) portion that is very important. The water needs to run across the cooler and hang out in there "dwell" to cool off. Mainly how long that "dwell" needs to be is dependent of many factors, mainly coolant flow "in" temperature, and size and dimension of the core (thickness isn't nearly as effective as face volume" )
Obvious factors include atmospheric conditions and airflow speed.
The heat exchanger is your bottleneck because the flow should never exceed the required dwell time.
Since most will never change out the Charge cooler on top of the motor, the maximum flow characteristics are probably decided by radiator (heat exchanger) size, limited of course by available space. SOOOOO. Get the largest heat exchanger in there and calculate the pump size using the variables above. easy right!? hahahahahahhah nope.
Best I could do for now.
Thanks to anyone who read this and didn't care that they have no idea who I am.
No engineering degree (yet)
But this is how I understand the water to air issue being discussed;
The charge cooler isn't usually the problem. (cooler core above the motor in the intake) If cold water (coolant) always flow through it fast as hell, it will cool the charge air very well..(relative only to its size) This is NOT the problem area when considering pump speeds and flow.
It is the "radiator" (heat exchanger) portion that is very important. The water needs to run across the cooler and hang out in there "dwell" to cool off. Mainly how long that "dwell" needs to be is dependent of many factors, mainly coolant flow "in" temperature, and size and dimension of the core (thickness isn't nearly as effective as face volume" )
Obvious factors include atmospheric conditions and airflow speed.
The heat exchanger is your bottleneck because the flow should never exceed the required dwell time.
Since most will never change out the Charge cooler on top of the motor, the maximum flow characteristics are probably decided by radiator (heat exchanger) size, limited of course by available space. SOOOOO. Get the largest heat exchanger in there and calculate the pump size using the variables above. easy right!? hahahahahahhah nope.
Best I could do for now.
Thanks to anyone who read this and didn't care that they have no idea who I am.
Last edited by 95ONE; Nov 18, 2014 at 11:13 PM.
Senior Member
Joined: Aug 2014
Posts: 380
Likes: 1
2006 E55 AMG
Indeed. For lowest IAT's (slowest climbing, or fastest recovering), you'd want the flow (of water) to be as fast as possible across the intercooler, and as slow as allowable across the heat exchanger. Increasing pump flow is only good if accompanied by an increase in heat exchanger area.
Senior Member
Joined: Aug 2014
Posts: 380
Likes: 1
2006 E55 AMG
In simplest terms because you're trying to maximize ∆T (per area). At the intercooler end, increasing the flow of cold water maintains the largest possible differential in temperature between charge and coolant, while at the heat exchanger, slowing the flow does the same for ∆T between coolant and outside air.
