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Blackeagle · 11-05-2002, 04:53 PM

Here is why I was thinking in terms of splitting the flow before it reaches the CPU.

If I buy and use the high psi MD-30 pump there is going to be a 5/8" line coming off the pump to the rads. Now I am thinking that the rads would be set up to be end/end with the four inlet/outlet ports as close together as possible. The large line from the pump comes to a custom Y that splits this large line into two .5" lines going into the two rads. Then rejoin the two .5" lines into one large one again, as we don't want to send 1/2 the flow to the NB & GFX. But there are no blocks that I've looked at that can accept such a large line. And wouldn't the loss of flow caused by having a reducer just before the CPU block waste in back pressure much of what you were trying to save for the CPU by not splitting the flow before the CPU? Now if we were talking about only the Atlantis block we could consider modding the blocks inlet/outlet barbs to a over spec size. (Or perhaps the higher speed of flow is what you think would offer best gains?) But this won't work on Cathar's Little Rapids water block, the impingment jet will be the pressure point in this block not the barb, agree? And lastly, wouldn't total system flow be higher if the 5/8" lines flow were split into 3/8"&1/2" before the CPU. Then encourage in every way possible all the flow that the .5" line can possibly take to go that way by the custom Y and tubulance mods to the NB and Gfx blocks. Then both of the lines coming off the blocks to go to the res near by saving need for another Y, the outlet line of the res would be .75" instead going back to the pump. this res will be attached to the right side case wall between the MB and the 5.25" drive bays. I'm trying hard to figure ways to keep this system as tight as possible for best preformance and minimum of restrictions. And there is not a single 90 barb in it, (2 45* on the Gfx).

the MD-30 has at the beginning a flow of 4.6 gpm @ 4' which is 2X the height of anything that will be in this water system in the case (18-20"). So we would have a slight gain in flow due to that reduction in the high point of the system but it won't be much. Now with every restriction of the cooling system the flow rate is going to fall off. With a start point of 4.6+ gpm we can't afford more than a 35% reduction or I'll be below the prime flow suggested by BillA of 3 gpm. And with 2 or at least 1 large rad + CPU, NB and GFX w/bs and perhaps as much as 5' of tubing of various sizes the total restriction figure is beyond my math to figure a estimate of. Can a MD-30 handle all the above without a loss larger than 35%, is it that strong?

I wish my math background was equal to the task of understanding BillA's work better, but it isn't. I regret I don't understand nearly half the terms he uses, and in some posts less than half. I glean what I can but it isn't enough. If anyone here on this board can come up with a ballpark figure of the reduction in flow caused by the above system's restrictions I'd be VERY gratfull indeed.

g.l.amour,

Who is bigmomma and what sort of rad has this (site, company ect.) come out with? Where to find?

Thanks

Thoughts and further advise guys?

11-05-2002, 04:53 PM	#103
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	Here is why I was thinking in terms of splitting the flow before it reaches the CPU. If I buy and use the high psi MD-30 pump there is going to be a 5/8" line coming off the pump to the rads. Now I am thinking that the rads would be set up to be end/end with the four inlet/outlet ports as close together as possible. The large line from the pump comes to a custom Y that splits this large line into two .5" lines going into the two rads. Then rejoin the two .5" lines into one large one again, as we don't want to send 1/2 the flow to the NB & GFX. But there are no blocks that I've looked at that can accept such a large line. And wouldn't the loss of flow caused by having a reducer just before the CPU block waste in back pressure much of what you were trying to save for the CPU by not splitting the flow before the CPU? Now if we were talking about only the Atlantis block we could consider modding the blocks inlet/outlet barbs to a over spec size. (Or perhaps the higher speed of flow is what you think would offer best gains?) But this won't work on Cathar's Little Rapids water block, the impingment jet will be the pressure point in this block not the barb, agree? And lastly, wouldn't total system flow be higher if the 5/8" lines flow were split into 3/8"&1/2" before the CPU. Then encourage in every way possible all the flow that the .5" line can possibly take to go that way by the custom Y and tubulance mods to the NB and Gfx blocks. Then both of the lines coming off the blocks to go to the res near by saving need for another Y, the outlet line of the res would be .75" instead going back to the pump. this res will be attached to the right side case wall between the MB and the 5.25" drive bays. I'm trying hard to figure ways to keep this system as tight as possible for best preformance and minimum of restrictions. And there is not a single 90 barb in it, (2 45* on the Gfx). the MD-30 has at the beginning a flow of 4.6 gpm @ 4' which is 2X the height of anything that will be in this water system in the case (18-20"). So we would have a slight gain in flow due to that reduction in the high point of the system but it won't be much. Now with every restriction of the cooling system the flow rate is going to fall off. With a start point of 4.6+ gpm we can't afford more than a 35% reduction or I'll be below the prime flow suggested by BillA of 3 gpm. And with 2 or at least 1 large rad + CPU, NB and GFX w/bs and perhaps as much as 5' of tubing of various sizes the total restriction figure is beyond my math to figure a estimate of. Can a MD-30 handle all the above without a loss larger than 35%, is it that strong? I wish my math background was equal to the task of understanding BillA's work better, but it isn't. I regret I don't understand nearly half the terms he uses, and in some posts less than half. I glean what I can but it isn't enough. If anyone here on this board can come up with a ballpark figure of the reduction in flow caused by the above system's restrictions I'd be VERY gratfull indeed. g.l.amour, Who is bigmomma and what sort of rad has this (site, company ect.) come out with? Where to find? Thanks Thoughts and further advise guys? Last edited by Blackeagle; 11-05-2002 at 05:03 PM.