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  1. #61
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    Originally posted by raventai
    just a theary on temp drop


    with the delta u may be making a venturi
    all that velocity coming out of the dela has a pretty strong foreward momentum and if the gap is not to large not much of it has a chance to escape out the gap, the vacume of the rushing air could also grab some more ambient air and drag it into the heat sink. increase velocity=decrease static (side) presure and increase ram presure. bernoulli's princapal


    this would not work as good on other heat sinks with wide fins that have more resistance to air flow or with slower fans that produce lower velocities these two instances u want a seal that will not let the ar out because of low inirtia or high resistance


    just a thought with all the veriables and no real math and enginearing we only have trial and error left
    Hmm... in that case, with someone like myself with a TT 31cfm fan, (granted on POS Coolermaster) would there be any possible benefit from partially covering up th sides of the fins, like some fan shrouds do around say an alpha? like :

  2. #62
    Joined
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    138
    I redid my Mc462 today. Went and bought a 12" piece of 9/32 aluminum tubing for 69 cents and cut four 1 1/2" lengths. The tubing wall is thin enough so the lower ones fit. With four 3"( 6/32 thread) machine screws this be the parts list for the mod.

    The reason I did this in the first place was it just seemed like there is a big dead zone in the middle of the fan. With the 53cfm Sanyo Denki, the hub of the fan is almost 1 1/2" wide. So a 1 1/2" circle right where the cpu contacts gets no air. Now I dont know if that matters or not since the base of the sink is one big chunk of copper.

    At some distance away from the fan does the dead zone receive air (ie the air spirals in) or does it simply spiral out never filling the space?

    Maybe some of the differences here are pins vs fins?


  3. #63
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    Better idea this time

    Well, the whole old fan duct thing didn't work like I wanted it to. I didn't have any metal tubing like you did, so I got to thinking. I took an 80mm wire fan grill, cut out all but the outside and inside rings, and put in on top of the HS, and then put the fan on with the longer screws and a nut on top of the fan grill holes. It is running the same on temps, but is quieter, and it's not just me going deaf, my girlfriend says it's bearable now. More lovin' for me now. hehehe Thanks Rockstarbob
    http://www.imagestation.com/album/?i...ulation_page=Y

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  4. #64
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    Originally posted by Tigsman
    Hmm... in that case, with someone like myself with a TT 31cfm fan, (granted on POS Coolermaster) would there be any possible benefit from partially covering up th sides of the fins, like some fan shrouds do around say an alpha? like


    maybe?
    it will create more back presure but more of the fin will get used as all the air will have to travel all the way down he fin


    only thing u can do is try it and see


    I think alpha dose that because of the way they mount thier fans upside down. air aproaches a fan in a semicircle and exits in a tight cone if it did not have the shroud the majority of the air would only pass through the top of the fins


    with a down facing fan u have velocity and inirtia on your side making more use of the whole fin top to bottom


    give it a try easy enuf to try it with electrical tape try few diffrent heights



    P.S. has anyone ever tried a "bell mouth" inlet on a fan? we use them when testing jet engines it is supose to alighn the incoming air inprove preformance and simulate the ram pressure that is present during flight. dought it would make a noticeable diffrece here just wondering

  5. #65
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    raventai Haven't had physics in a while(hate to think how long) but would it make sense that since the vacumn zone is dependent on the velocity of the flow of air would it make sense that on the SK6 a 30CFM should be raised say 2-4; a 38CFM 6-8 and 57 CFM 8-10.

    It would seem that each HSF is going to have different varialbles in relation to flow to vacumn creation and I am just wondering if anybody has tried different heights with different fans on just one type of HSF.

    Am getting the SK6 hopefully on Thursday and will be able to try out 60mm fans at 30 and 38 and 45CFM on Saturday.Tom

  6. #66
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    What is a bell mouth?

  7. #67
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    Newnan GA, USA
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    bell mouth


    like i said dont think it would make much of a diffrence but if someone has something lying arround to try it they may be pleasently suprized

  8. #68
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    Very nice idea. It would keep the pigeons from being sucked into the Delta also.

  9. #69
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    Cool, like the old intake stacks on a 60's Grand Prix car!

    A_Sr.
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  10. #70
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    yes same thing same reason

  11. #71
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    Originally posted by raventai
    P.S. has anyone ever tried a "bell mouth" inlet on a fan? we use them when testing jet engines it is supose to alighn the incoming air inprove preformance and simulate the ram pressure that is present during flight. dought it would make a noticeable diffrece here just wondering
    I would think not because of 2 reasons. #1, the short distance the air will be traveling and #2, because a bell mouth is supposed to capture air outside the radius of the bell. If you put a fan in front of it going 300mph it would be less efficient then if the bike was traveling 300mph and capturing all the air that it can. just my 2.

    p.s. I'll give that tape trick a try.

  12. #72
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  13. #73
    XariX is offline Last Bastion of odd Info
    Joined
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    Question

    As much as everyone has asked for them. i am still seeing no pictures of this acclaimed breather mod. Though it's benefits seem great, one guy even gets more lovin'. Maybe some of the site gods could do a How To article. but pictures are a must for some of the less technical users. Side note: Anyone have experience with the vantec CCK-6035d?
    Yar.

  14. #74
    Joined
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    USA
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    CCK-6035D

    I've got experience with the Vantec. I've been following this thread & I'll tell you what, if some of these guys had access to a machine shop, I think we as consumers would really benifit from it! Some of you catz have some deep ideas & I feel like that's who us regular joes need to have in the loop as far as development goes... I've gotten to the point where when I take off my case, my temps shoot up so I think my temp battle is over ...oO yeah, The Vantec CCK-6035D ROCKZ!
    /\/\UF/-\S/-\
    Windows 7 Ultimate

  15. #75
    Joined
    Jun 2001
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    Tucson AZ USA
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    Originally posted by XariX
    As much as everyone has asked for them. i am still seeing no pictures of this acclaimed breather mod. Though it's benefits seem great, one guy even gets more lovin'. Maybe some of the site gods could do a How To article. but pictures are a must for some of the less technical users. Side note: Anyone have experience with the vantec CCK-6035d?
    Here is a picture of a Delta 38, on top of the Taisol.
    I hope the picture posts, my first pict post on this site.
    The shims are nylon,12 mm's long. I used drywall screws, the folks at the hardware didn't have any 1 3/4" #6 sheet metal screws. But they had toasters and frying pans?

    Anyway, this cost me $1.25 for the shims and the screws.




    Hey, if anybody can tell me a little about sizing snaps I sure could use a lesson! LOL At least the detail is nice, I really enjoy the picture element of this computer stuff.

    EDIT:
    Done. Special thanks to raventai , for help with picture posting.

    Jim L
    Last edited by Sparx; 08-23-2001 at 06:42 PM.


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