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Post by JoeyBee on Nov 25, 2015 18:47:25 GMT -5
Has anybody ever wonder if the rumor was true that the blue "racing" CDIs were filled with gravel? Today I found out that it depends on which one you buy. All CDIs are filled with a insulating medium. For most units that medium is a plastic resin which sometimes includes fillers to possibly reduce cost. One was filled with sand. [Blue Advanced "Racing" CDI from Ebay]  [Gold Advancing CDI from NYCScooters]  |
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Post by wheelbender6 on Nov 27, 2015 14:02:22 GMT -5
Nice to know that something can still be built without hi-tech materials.
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Post by JoeyBee on Dec 1, 2015 18:00:09 GMT -5
Updated with video.
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Post by tvnacman on Dec 1, 2015 20:34:05 GMT -5
Very nice video. I admit I was unsure where you were going with it. I suspect the sand is for dissipating heat. When I was testing regulators one of them was loose in the metal body. The regulator tested good but I tore it opened anyway It had the very fine sand. I would like to replace the variable timing cdi you used for your experiment The NYCSP0007 . I'm unsure how you ordered it please let me know. Were there any other items you were interested in dissecting?
John
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Post by JoeyBee on Dec 1, 2015 21:15:28 GMT -5
Very nice video. I admit I was unsure where you were going with it. I suspect the sand is for dissipating heat. When I was testing regulators one of them was loose in the metal body. The regulator tested good but I tore it opened anyway It had the very fine sand. I would like to replace the variable timing cdi you used for your experiment The NYCSP0007 . I'm unsure how you ordered it please let me know. Were there any other items you were interested in dissecting? John That's very nice of you to offer to replace it. But I am already running one in my 150. If you have a stock A/C CDI laying around, I need one of those as a backup. I'll pay for shipping. I'll PM you my contact info. |
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Post by JerryScript on Dec 2, 2015 3:15:19 GMT -5
FYI- The filler in electronic components is there for several reasons. 1- protection from thermal shock, sudden changes in temp like those in an engine compartment can cause wires, connectors, and components to crack or short circuit 2- protection from moisture, enclosed components can trap moisture, leading to damage such as short circuits, resin (plastic) and some types of sand will protect the component 3- protection from vibration, resins are especially good and preventing vibration damage 4- protecting circuit design from reverse engineering There are other reasons, and many different materials that can be used. Bottom line, the presence of sand or resins does not indicate an inferior product. Here's some info from a manufacturer of "fillers": www.sealantequipment.com/technical/potting-electronics.htm |
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Post by JoeyBee on Dec 2, 2015 3:37:11 GMT -5
Thanks for that info JerryScript... That really answers why manufacturers put various materials inside the units. |
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Post by UniqueSP on Dec 3, 2015 19:30:57 GMT -5
The inside of the blue and orange CDI's My supplier in China asked me if i wanted a better quality circuit board in my CDI's but the cost was higher. He provided this pic to me.  |
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Post by JerryScript on Dec 4, 2015 0:25:56 GMT -5
The main issue on the boards is the capacitors. Cheap liquid capacitors have been the bane of PC motherboards for years, they actually boil over popping the top. Good soldering is the next most important thing, and that takes an experienced eye, or testing equipment to check.
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Post by tvnacman on Dec 4, 2015 7:34:47 GMT -5
electrolytics and solder joints made by machine were the norm in TV repair prior to flat panel.
John
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Post by JerryScript on Dec 4, 2015 22:35:22 GMT -5
electrolytics and solder joints made by machine were the norm in TV repair prior to flat panel. John I still remember both our Curtis Mathis TVs with the 6 year warranty. Bought one to replace the other, and both died at 6 years 2 months. They knew the limits of the components back then, these days we push the limits and complain when we can't exceed them! |
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Post by tvnacman on Dec 5, 2015 5:54:30 GMT -5
JerryScript I had a short run in TV repair from  -04 in 03 the price dropped.. The warranty and failure just past it , I guess your thinking planed obsolescence. They did that with light bulbs. I had a video. John
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Post by JerryScript on Dec 5, 2015 10:18:18 GMT -5
The Curtis Mathes was a modular design, less solder points. The repairmen carried all modules with them, so most service calls we around 20 minutes, just figure out which module is bad and swap it out. en.m.wikipedia.org/wiki/Curtis_Mathes_Corporation |
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-04 in 03 the price dropped.. The warranty and failure just past it , I guess your thinking planed obsolescence. They did that with light bulbs. I had a video.