2-302 air pressure drop?/2-6.75" papst fans advice

[slicey]

hi all,
does anyone, oh....i don't know...perhaps Weapon maybe, know what the
pressure drop on this core is? high, medium or low? i'm trying to design a
w/c box and one of the main criteria is weather to design the inner
ducting for series or parallel fans. the ducting chambers will surely
increase the airflow impedance but i'm not sure how much more the core
will add to it.

also, since this is my 1st venture into to w/c, will someone please advise
me on my hardware choices. i'll list my cooling gear 1st, then my comp.
stuff next if it makes any difference?
polar flo tt, the core-you know the one i'm talking about a mcp350
modded(1/2" inlet), though i've started to question if this was the right
pump for the job? just learned from you guys that popular opinion is to
cool the GPU core only and sink the not too hot running DDR3. so....i've
got to start researching GPU coolers. also read the maze 4 was a pretty
good performer. later, i will look inside my PSU to see if w/c that is
feasible or not.
for comp. stuff, i have abit AI7, 3.2E, BFG6800GT, Antec 550 true control.
i could really use your input-good or bad
slicey

[RotorHead]

Are you asking what the pressure drop throught the radiator is for airflow??

[slicey]

but of course

[RotorHead]

2-302 ??

Is this the type of radiator?

I asume this is some type of heater core, and you want to mount 2 X 6.75 inch papst fans on it. Will they be both on one side or one on each side?

[slicey]

yup, it's a '77 bonnevile w/ac core. i'm not making my w/c box like any other i've seen, though i asked people on this forum and others to post pics of their rad boxes but only a handfull did in total unfortunately. both fans and core will be inside a sub enclosure within the box itself(if only i knew how to include a sketch) then the exhaust/intake will each follow an internal ducting pathway that leads to the underside of the box where the air can exit/enter respectfully. the inner duct walls will be lined with an acoustic pad designed to absorb reflected sound energy and maybe the padding will be covered with a perforated lining made of steel or plastic? this should decrease the turbulance of the airflow a little, while negating the effectiveness of the sound padding a bit(there is no free lunch in engineering something :rolleyes: )
i don't know how i will mount fans in relation to core just yet. if parallel, then one side only. if series, could be both on same side or one fan on each side. i'm leaning towards one of the series configs most likely, though. As you probably know, by staging fans in series, the static pressure can be increased, but this will only happen in systems with high impedance. the reason i'm "engineering" my w/c box this way, with the ducting, is to deprive the fans' noise outputs a more direct, unhindered path back to my ears. i'm merely trying to apply some fan laws in building my box so i can maybe get things right the 1st time. :wpleased:
and let's not forget the rest of my w/c setup. i need input-please,please,please! :scratch:

[RotorHead]

Ok, gotcha now,

I think with the fans that you have selected, your pressure drop through the core shouldn't be a problem if you run the fans in series.

If I understand correctly you are going to build something like this.....But with the intake and exhaust on the bottom.

http://members.cox.net/ebecquet/baffelbox.JPG

[slicey]

your right on with my idea Rotorhead, but i wasn't planning on any of those right-angle baffles inside the ducts. i'm worried about raising the system impediance too high to the point ihave to increase the voltage on the fans. at 24v they SCREAM. at 12v they are still a little loud to my ears, but that's not in the box yet. i still think i'll want to run the pair at 10v or so to make my ears happy. thanks for working on the pic!
later slicey

[Weapon]

hi all,
does anyone, oh....i don't know...perhaps Weapon maybe, know what the
pressure drop on this core is? high, medium or low? i'm trying to design a
w/c box and one of the main criteria is weather to design the inner
ducting for series or parallel fans. the ducting chambers will surely
increase the airflow impedance but i'm not sure how much more the core
will add to it.

also, since this is my 1st venture into to w/c, will someone please advise
me on my hardware choices. i'll list my cooling gear 1st, then my comp.
stuff next if it makes any difference?
polar flo tt, the core-you know the one i'm talking about a mcp350
modded(1/2" inlet), though i've started to question if this was the right
pump for the job? just learned from you guys that popular opinion is to
cool the GPU core only and sink the not too hot running DDR3. so....i've
got to start researching GPU coolers. also read the maze 4 was a pretty
good performer. later, i will look inside my PSU to see if w/c that is
feasible or not.
for comp. stuff, i have abit AI7, 3.2E, BFG6800GT, Antec 550 true control.
i could really use your input-good or bad
slicey


air pressure drop on a 302 is minimal. For example, San Ace 120s (model 109R1212H101) have a static pressure rating (Pa) of 64.7 -- when they are mounted to a 302 with shroud at 1.6" of standoff, the amount of air moving through the back of the fins almost feels like the core is not even there. With the fans you are planning on using, you should not have any problems with airflow.

As for waterflow, mod the fittings and use 1/2" ID fittings and it will be very low pressure drop.

the hardware:
waterblock - cathar's g4 or g5 followed by the swiftech 6000/6002 series and the dangerden tdx. Chosing between the tdx and the swiftech would be a matter of how much flow and head your pump can produce. The TDX is very good with the #4 accelerator nozzle when it is used with a high head pump. The new chrome topped TDX should be available before long :) but the brass topped one works well and would save a few $$.
gpu block - maze 4
waterpump - if you could find one, the original version of the rainbow lifeguard quiet one. Unfortunately, they are no more since pentair aquatics bought rainbow and changed the design. The Laing D4 (Dangerden D4, swiftech mcp650) are good but some find the high pitched sound they make annoying.

[slicey]

thanks Weapon, i have a feeling you don't wander in this forum much. anyway i spoke to an application engineer at papst and he said cooling about 200w will require around 50CFM! Don't think that will be a problem with fans w/ pressure of .75 inH2o. i give you credit for my choice of core, after the the great tutorial of yours on modding the 2-302. my dad's shop easily had all the tools to mod that puppy and it came out looking fantastic! think i'll just go w/ w/c gear i've mentioned. it may not be the most ideal, but i believe it will be fine for mild O/C action?
slicey