A Look Inside CDI Units By JoeyBee (Read 1,504 times)

[JoeyBee]

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]

[jowano]

Hot off the press! Thanks for the share.

[JoeyBee]

Dec 2, 2015 7:34:00 GMT -6 jowano said:

Hot off the press! Thanks for the share.

Thank you for the positive comment. I didn't want to seem like I was spamming the forum since I already posted the video over on It Is The Ride forum. But I know we have a different group of members here on Scooter Doc. I try to be an active member of both forums, but that hard to accomplish.

[richardv]

Thanks for taking the time and effort. That may come in handy in the near future. The difference in the boards was the most interesting for me.

[jct842]

All of them need some way to get the heat out to the heatsink. I would not get to carried away on what the medium is unless it turns out to be a heat insulator. A space age goverment military grade unit might have an oil to insulate electrically and to carry unit heat out to the heat sink. It also might be a $10,000 part! The Quality of your units might be judged on the components used on the board resistors, capacitors, and semiconductors and the solder joints. Many small electrical units fail because of poor quality capacitors.

[JoeyBee]

Dec 2, 2015 22:13:47 GMT -6 richardv said:

Thanks for taking the time and effort. That may come in handy in the near future. The difference in the boards was the most interesting for me.

If you are interested in the differences between the boards I can send you more detailed photos of each CDI. I had the balance the video between length and amount of content.

[tvnacman]

Dec 2, 2015 15:17:27 GMT -6 JoeyBee said:

Dec 2, 2015 7:34:00 GMT -6 jowano said:

Hot off the press! Thanks for the share.

Thank you for the positive comment. I didn't want to seem like I was spamming the forum since I already posted the video over on It Is The Ride forum. But I know we have a different group of members here on Scooter Doc. I try to be an active member of both forums, but that hard to accomplish.

JoeyBee
Take post count into consideration, when a police officer asks which way they went. The criminal will point away from him/her self.

John

[jct842]

As far as sealing electrical components goes it has become much easier with semiconductors verses mechanical ones such as relays. In the late 60's I worked for a manufacturer that produced relays used in torpedos. Before they were soldered shut they were filled with helium gas, then put in a vacuum chamber that had a sensor for helium that would detect 1 part in millions of air. Myself and one other guys job was in part to calibrate the veeco machine. Small military grade transformers were filled with oil.

[jaxrhapsody]

Dec 2, 2015 23:23:20 GMT -6 jct842 said:

All of them need some way to get the heat out to the heatsink. I would not get to carried away on what the medium is unless it turns out to be a heat insulator. A space age goverment military grade unit might have an oil to insulate electrically and to carry unit heat out to the heat sink. It also might be a $10,000 part! The Quality of your units might be judged on the components used on the board resistors, capacitors, and semiconductors and the solder joints. Many small electrical units fail because of poor quality capacitors.

I watched a youtube video a few years ago, where a guy built a desktop computer, and used- I think canola oil- to keep it cool, basically building a sealed tower, and filling the thing up with the oil, and temperature was about as low as the liquid cooled units. I'm kinda surprised they are filled with something, but thinking about 80s fords, the emissions computer under the hood, had something like these cdis have on the fender facing side, that looked like blacktop. I'm not sure how hot a cdi can get, I'm sure it, and other circuitry could be combined to one unit, and a desktop liquidcool system could be retrofitted, and the little radiator could be placed behind the front wheel, or somewhere with airflow. Would be a little bosozuku.