Noisy Delta 38cfm cure...(from front page)

[Mr B]

Just read this article....looks like it sure would quiet these fans down if you find the noise objectionable.

I've got a PEP66T, and I really don't find the noise to be too bad, especially with the side of the case on. However, having one of these fans, and being in the automotive industry, I have some of the clear silicone and electrical tape (lots, really) kicking around. In the interest of science, I'm gonna try this in the next couple of days, and see how it works.

I'm going to the in-laws for Mother's Day dinner, where I have all of my auto stuff stashed in their cellar (man, get good in-laws...they're awesome!!). I'll grab a couple of tubes of the silicone while I'm there.

I don't have any way other than by ear to test a noise differential, but will post what I find when I do this mod.

Stay tuned.....

Mr B

 

[klosters64a]

Thanks, Mr B! My concern is that I believe that the silicon glop is for caulking, and isn't an adhesive per se. Perhaps two wire fan covers, one on each side of the Delta, would be a sensible precaution. I want a Delta 38 bouncing around in my case--NOT!

 

[Mr B]

I'm thinking that myself. I will figure out some form of a passive retention, that wont allow it to fall off. Perhaps a zip tie holding the power lead to the heatsink, to at least keep it from falling too far.

Yeah, straight below is the back of my vid card...really don't want my Delta bouncing around on that....=)

I'll arrange something, that will "hold" it in place, yet still allow the silicone to handle the vibes.

Good point. Thanks for the thought on this!

Mr B

 

[awol]

how does separating the fan and hs reduce the noise? i don't understand that part. i thought the loud noise was the whine the fan creates because of the speed. so how does reducing the vibrations reduce the noise?

please clarify...

 

[Door Knob]

cel950 (May 13, 2001 12:20 p.m.):
how does separating the fan and hs reduce the noise? i don't understand that part. i thought the loud noise was the whine the fan creates because of the speed. so how does reducing the vibrations reduce the noise?

please clarify...

Yup, the vibration causes more noise. I have seen a similiar post (probably here) on how to do this with case cans using rubber gromets. Just one of many things I plan on doing when I return home to my beloved garage. Good luck Mr. B and thanks for letting us all in on your results.

 

[OpenFriday]

Ive got the delta in question and just made it run @7V. Proc temp went up 1C and sys temp went up 2 C but i cant ever hear it anymore. Thanks Shadow
This may not be for everybody but it worked for me.

 

[sifu quoc]

yeaup... i run it at 7 volts too.... and my 120mm at 5volts... the 2 exhaust 80mm are at 7 volts too

the loudest part now is still the 120's lil grumble....

system temp is always at room temp... system temp at about 33 under full load

pIII 700

 

[Mr B]

7:00 PM, Eastern Standard Time;

Just got back from dinner at the in-laws....had Chinese take out....yummy!

Mission accomplished. Retrieved 1 (one) tube of Clear RTV Silicone (Permatex...the good s***) The silicone is setting as I type.

It mentions in the text in the article (from front page) that the silicone should set for 24 hours. So, I will be testing this tomorrow night, around 10:00 PM EST. After which, I will post my results/opinions on this hsf mod.

One note thus far...if you want to run a grill, mount it before putting the silicone on the fan as described. I did, as I could see that being a messy proposition with the silicone on the fan. (I know me...I'd drop a screw, and set the fan down on my desktop, silicone side down, while I bent down to pick up the screw.....)

Stay tuned.....

Mr B

 

[OpenFriday]

Cool Mr.B cant wait to see the reasults.

 

[Phil]

the silicon stuff is not meant to be used as an adhesive but it can hold stuff in place, the heat from the heatsink will make the bond stronger over time as well, I would recomend running for a while with the fan off (I can run my cCO celeron 600 at 900mhz with 1.75v and no fan all day with my lapped FOP) if the silicon goes into the screw holes of the Alpha's shroud it will have the effect of a screw and nut as it will spread out slightly, and maybe if you put some on the top side of the screw hole on the delta it will bond with the silicon below and help hold in place, I used some silicon a while ago on all my fans and it's cuts the overall noise made by the pc down a lot

 

[Mr B]

Phil (May 13, 2001 06:51 p.m.):
if the silicon goes into the screw holes of the Alpha's shroud it will have the effect of a screw and nut as it will spread out slightly, and maybe if you put some on the top side of the screw hole on the delta it will bond with the silicon below and help hold in place

Due to design differences between the author's Alpha, and my PEP66T, I couldn't install screws (nor would I need to) to hold the shroud on. The shroud on the PEP66 is held in place by a quartet of screws on the sides of the shroud, not the top.

That leaves those holes open, and indeed, silicone was pushed down into those holes, which will strengthen the bond there.

In the article, the author put silicone on the fan, through the mount holes, to bond in a similar fashon as you describe. I did the same, as outlined in the article.

The electrical tape then serves not only as sides to direct the air into the heatsink, but also to keep it centered, and somewhat steady. I still will arrange some form of retension (passive) to ensure that the fan doesn't take a voyage south, onto my vid card.

Mr B

 

[Shadow ÒÓ]

Mr B, I like the idea but he failed to mention preformance differences. I have a few Ideas of my own I'd like to work with on my FOP 32, but since you are starting yours first, I'll wait for your results.

 

[ken257]

If the adhesion properties of the silicone are in question try some Dap Aquarium Sealant it is a good clear silicone made to build custom fish tanks and seems to have a little better bond then regular silicone.

 

[Shadow ÒÓ]

also Mr B........I'm quiet sure you're familiar with the same goop you use on engin rebuilds.......very tolerant to heat and comes in so many pretty colors. =)

 

[Slake]

I'm betting the silicone will hold like gangbusters. I used it when I was roofing and sometimes had to pull a piece of flashing off that was sealed with it and it had surprising tensile strength. The aquarium cement seems like a great idea too. Good luck Mr B.

 

[Mr B]

Thanks for the tech ideas, and the support, guys...

Had a brainstorm on a passive retention device to keep the Delta from going too far if it should detach. I'll elaborate tomorrow....

Mr B

 

[proze]

i think the silicon will cope fine holding the delta. because the delta spins so fast, it can't have very high tolerances in lateral movement or the vibration would be tremendous. mine is almost perfectly still when i hold it.

but rather have a backup thannot, i suppose. ;-)

 

[Breadfan]

I guess also if you have an FOP38 or WBK38, you could put the retainer clips back on after the silicon set...that'd keep things from falling off, but would those clips transmit much vibration? I doubt they would...hmmm may have to try this very soon...

Mike

 

[Breadfan]

Not double posting, just thought of a few things....

I wonder why I didn't think about this...I remmeber showing a friend how loud the delta 38 was when I switched to a 90mm fan on my fop38. I was sorta dissapointed becuase when I plugged it in unattached and held it, it didn't make that much noise.

I now have 2 delta 38's becuase I got a WBK to replce the fop, and put an 80mm sunon fan on it...

This will be neat to try...maybe the other delta could be used as an extra exhaust or intake fan on my case....

Mike

 

[Tachyon]

I'm not sure if anyone else has noticed, but the fan shown in the article (face up) is a Pico Ace (Sanyo Denki)....not a Delta!