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thermal paste ? 200 1992

posted by  riverbend on  Wed Mar 16 16:31 CST 2016
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last visit: Wed Oct 22 15:29 CST 2014
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What are you using for heatsink paste for the ignition amplifier ? Radio Shacks around here are long gone.

Thanks

Greg







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    thermal paste ? 200 1992

    uid 27's pic
    posted by  Art Benstein on  Thu Mar 17 09:44 CST 2016
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    last visit: Fri Oct 17 20:10 CST 2014
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    Seriously, if I did not have a lifetime supply of all manner of Wakefield compound equivalents, I'd grab a tube of Desitin. Then place an on-line order.

    Before Wakefield Compound was marketed, most heat sink interfaces used silicone grease to fill the micro-gaps and aid in heat transfer. You probably already have plenty of that around as "dielectric grease" or "connector grease" and don't even need to go to the store for diaper rash ointment.

    The thermal paste replacement is, in my opinion, a non-issue. As an experiment, in our '89 wagon, I've been running the ignition power stage with the heat sink mounted dry and dangling from the connector (not affixed to the fender) so I can pull it out and feel the temp rise after a hard drive. It is warm, but evenly so, and never so warm I cannot hold it in my hand, a temperature which is well below that of semiconductor ratings.

    An exception might exist if the ignition coil is faulty, from leakage or shorted turns. This might place additional stress on the power stage so that it would fail if the heat sink performance failed under a hot hood. But I think most success stories arise just from the act of "connector reseating" that occurs during troubleshooting.


    --
    Art Benstein near Baltimore

    Forget the health food. I need all the preservatives I can get.








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      thermal paste ? 200 1992

      posted by  Onkel Udo II on  Thu Mar 17 10:18 CST 2016
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      last visit: Fri Oct 24 08:50 CST 2014
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      Based on this, what do you believe the failure mode to be when they actually are failed? I have had two instances now where a known good is swapped in for troubleshooting and the car magically runs. Swap the old unit back in and it does not.








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        thermal paste ? 200 1992

        uid 27's pic
        posted by  Art Benstein on  Thu Mar 17 10:57 CST 2016
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        last visit: Fri Oct 17 20:10 CST 2014
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        Onkel, I don't know.

        As I related in a post some time ago, I thought I finally had a power stage failure to analyze, when its replacement seemed to "fix" the no-spark problem.

        However, I was in a hurry, and did not verify the original repeated the failure. That very suspect unit is the one hanging in the air now over a year later. I was hoping to get my brother to put a microscope to it and give you the answer to your question, at least for this one example.

        I suspect most of us are not as diligent as you were to re-test the suspect unit, so the replacement and its cost are instantly justified. You're welcome to pop your dud in the mail to me, and get a report (eventually) in return, but even then, just the few we are allowed to see do not comprise a large enough sampling to determine the usual failure mode. But, heat cycling over time is certainly the largest stress to assembled electronics.



        benstein@cleanflametrap dotcom
        --
        Art Benstein near Baltimore

        Wisdom comes with age, but sometimes age comes alone.








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          thermal paste ? 200 1992

          posted by  Onkel Udo II on  Fri Mar 18 04:38 CST 2016
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          last visit: Fri Oct 24 08:50 CST 2014
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          I may be diligent about "rechecking" to verify it was a part failure (actually, it was using my DD to test other peoples' cars) but I never keep known bad parts and in both cases I would not have gotten them back anyway.








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    thermal paste ? 200 1992

    posted by  Steve on  Thu Mar 17 09:02 CST 2016
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    last visit: Fri Oct 24 07:16 CST 2014
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    A lot of the stuff I used to get at Radio Shack I now buy on EBay. Prices are competitive and you would be surprised at what you can buy.








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    thermal paste ? 200 1992

    posted by  Onkel Udo II on  Wed Mar 16 19:20 CST 2016
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    last visit: Fri Oct 24 08:50 CST 2014
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    El-cheapo add-n item on amazon...

    http://www.amazon.com/StarTech-com-Thermal-Compound-Heatsink-SILVGREASE1/dp/B00006B8DX/ref=sr_1_2?ie=UTF8&qid=1458177542&sr=8-2&keywords=heat+sink+paste








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    thermal paste ? 200 1992

    posted by  jonny2box on  Wed Mar 16 16:46 CST 2016
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    last visit: Tue Sep 30 00:37 CST 2014
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    I changed some dry crusty thermal paste on my ignition amplifier a couple years ago.
    Went to the store that bought out Radio Shack. Called The Source. I'm in Canada, so maybe not helpful for your location. But I will say this. Thermal paste was terribly expensive tiny little tube for like 12 bucks and did absolutely nothing to solve my ignition problems. If you're stuck and really can't find any stores in your area, I'd be willing to look for the leftover tiny 0.5 oz tube probably in the rear tool hatch compartment and stick it in the mail for you. Worst damn 12 bucks I ever spent. Helping a fellow brickboarder - priceless.







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