PowerWatch <http://www.powerwatch.com> had (1997-8) a 'Quieting Down your Power Machine' thread which was 'retired' a few years ago.
I saved some of the significant postings from that thread if anyone wants to review them - e-mail a request 'off-list.' ********************************** Summary... There's usually a third fan in the power supply which is often the noisiest. Silencer fans from Power-On products <http://www.power-on.com/sales-2.htm> were then recommended...though I found them locally also. Somewhat less airflow, as I recall. Air Volume: 28 CFM Max. Static Pressure: 0.07 Fan Speed: 1600 RPM Acoustical Noise: 20dB(A) Rated Voltage: 12VDC Operating Range: 6-14VDC Current: 75mA Power Consumption: 0.9W Bearings: ball bearings Lead Wire: AWG 24, red & black Size: 80x80x25 mm. Weight: 2.79 oz For splicing wires either 'push-button' or 'crimp' connectors from Radio Shack easier/better than splicing and soldering (the recommended alternative). ****************************************** I replaced all three fans in my PCP210 MT (80 mm in power supply and back of case; 60 mm on top of CPU heat -sink) w/all 80 mm - heat-sink plastic bracket accepts that - took 1 hour - once I figured out how to get the power supply out so I could get into it. G3/400 upgrade made no difference, as G3 use less power/generates less heat than 604e. Personally I couldn't imagine anyone not wanting to do this... Made ENORMOUS difference in noise level... My 'quiet' APS/IBM external drive was now louder than PCP210. bill fuller =========================================== At 1:04 PM -0400 7/13/02, Power Computing List wrote: >At 22:04:37 -0700 7/12/02, Jay Pricer <[EMAIL PROTECTED] wrote: > >Subject: PCP Fan Replacement > >I recently replaced the noisy/vibrating fans in my PCP240 and wanted to >share for anyone annoyed by their PowerComputing Box. >I recently replaced the noisy/vibrating fans in my PCP240 and wanted to >share for anyone annoyed by their PowerComputing Box. > >There are two fans in this box, one 60mm fan over the processor daughter >card and one 80mm fan on the back of the box. By unplugging each fan and >running the machine I found that the processor fan contributed the most >noise. I attribute that to the plastic bracket that holds the processor fan >which is in turn mounted to a cross bar thingy (tech term). The fan just >vibrates the whole works. I had tried foam pads, tightening screws and >ofcourse duct tape all with minor success. The back fan is securely mounted >directly to the box which removes all that vibration noise. > >So after five years with this box I finally decided to do something serious >about it. [snipped] >The 60mm Panaflo fans compared to the Nidec was > L1A Nidec >Airflow 14.1 CFM 0.5 m3/min (roughly equivalent) >Noise 25 dB-A 35 dB-A (log 10 scale, so 10x as loud!?) >Power 1.32 watts 2.14 watts (38% less power used) > >Putting them in was pretty easy with the just the normal precautions and >pray not to drop a screw on the motherboard. The only hack was the >connectors to the the motherboard. One fan came with just bare wires, so I >snipped off the connector from the old fan and twisted and taped it on to >the new fan. The other fan came with a slightly different connector that I >was able to scrape off a small part that didn't fit to get it to go on to >the MB connector. > >Result is a much quieter system which really makes a difference. I didn't >realize how nagging and nerve racking it was until it was gone and don't >have to hit the box to try to get it to be quiet. Anyway, hope this helps >someone out and would like to hear if anyone else has been messing with fan >noise. >------------------------------ > >At 10:21:39 -0800 7/13/02, Michael S. Macdonald <[EMAIL PROTECTED]> wrote: > >Subject: Re: PCP Fan Replacement [snipped] >Jay, I posted a note a while back about excessive vibration coming from the >Nidec fan in my PCP. I actually replaced the fan with a nidec from a Mac 2Si. >The 2Si fan was the same size, but drew less power and was thicker, and, >despite being many years older, substantially smoother running. >I attributed this to the 2Si nidec being made in Japan whilst the PCP nidec >was made in China. > >I also had another PCP with a processor fan which failed altogether. I >think that PCP owners should take note that excessive vibration on the fan >that sits in that CPU hold bown bracket may contribute to problems over >time. > >I recommend that if you splice a connector onto one of these fans, that the >wires be twisted and soldered berfore taping to ensure a solid connection. >A soldering kit for computer tinkering is about >$10 - $15 and mine has had far more use than I originally envisioned. -- Power Computing is sponsored by <http://lowendmac.com/> and... 123Inkjets.com <http://lowendmac.com/ad/123inkjets.html> Support Low End Mac <http://lowendmac.com/lists/support.html> Power Computing list info: <http://lowendmac.com/power/list.html> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> List archive: <http://www.mail-archive.com/powercomputing%40mail.maclaunch.com/> Using a Macintosh? 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