Inside the CDI module (more sand!)
Added 2020-11-06 01:53:10 +0000 UTCHere's the CDI (Capacitive Discharge Ignition) module from the quad/scooter loom.
Its purpose is to charge a capacitor from the high voltage winding on the alternator/magneto, and then dump that charge through the primary of the ignition/spark coil to create a high voltage spark at the tip of the spark plug when the engine flywheel triggers a sensor.
Comments
Shorting the plug wire to kill the engine is pretty much commonplace in small engines.
Sibilator
2020-11-11 20:31:41 +0000 UTCThat analogy of turbulent water filling a tank and providing a smooth flow of water out, is the best description of a smoothing capacitor ever, I had never thought of it that way before.
Mike Hughes
2020-11-08 17:47:55 +0000 UTCLol. Well he could get tossed overboard from a rough sea 😂🎂
Cerity
2020-11-07 01:33:26 +0000 UTCMaybe also to allow for thermal expansion and contraction.
Big Clive
2020-11-07 01:09:18 +0000 UTCCCM 500cc single motocross bike ignition noise sounded like a 1980s camera flash, hi pitched whine. Made in Bolton UK, it may be a surprise they even exported to the USA https://en.wikipedia.org/wiki/Clews_Competition_Motorcycles
John Harrison
2020-11-06 20:46:29 +0000 UTCThe China sand is a plot to claim land in other countries ;-)
John Harrison
2020-11-06 20:32:41 +0000 UTCClive lives on the Isle of Man. It's like 14 feet across ... where could he go???!!?
Peter Laws
2020-11-06 19:26:31 +0000 UTCWe deal with similar ones where I work. Potted in clear epoxy with small river rock. My understanding is that the rock/sand pulverizes, absorbing the shock of violent failures.
Michael Thompson
2020-11-06 17:09:26 +0000 UTCI missed the stream as well - just didn't see the email for some reason. It was there, just blind for some reason.
John Carr
2020-11-06 15:11:14 +0000 UTCI've worked on multiple smallish (a few kW) gasoline generators with CDI ignition that use the same design of shorting the magneto winding to ground when the ignition switch is switched off, so I think it's probably a common design. I've also seen some good quality ~5kVA transformers that appear to have sand under clear potting epoxy, but those are meant for dry areas and have a solid epoxy layer providing sealing. I don't really know why they have sand in them though.
John Hiesey
2020-11-06 12:37:40 +0000 UTCStop it. Stop saying long trips. There will be no long trips taken with this thing unless the inevitable explosion throws you off a cliff.
Michael Thompson
2020-11-06 09:01:20 +0000 UTCI've not checked that yet.
Big Clive
2020-11-06 06:03:38 +0000 UTCI was wondering if it was a frequency related timing thing.
Big Clive
2020-11-06 06:03:22 +0000 UTCMainly an understanding of how it all works. The modules will probably work OK, but spares would be a good idea on a long trip.
Big Clive
2020-11-06 06:03:02 +0000 UTCThere'll be the HVAC Overtime stream today and the usual Saturday stream.
Big Clive
2020-11-06 06:02:12 +0000 UTCIs the wire itself at least made of copper?
Scott Miller
2020-11-06 04:19:12 +0000 UTCIs that odd RC network associated with spark advance/retard perhaps?
Dave Davies
2020-11-06 03:36:42 +0000 UTCAny worthwhile components to scavenge from the loom❓
Cerity
2020-11-06 03:29:28 +0000 UTCI’m also mad I missed the live stream today! I remembered about an hour before it started but then work got in the way and it slipped my mind.
Lostngone
2020-11-06 01:59:03 +0000 UTCI hope you’re saving all this sand for your Zen rock garden! 😂
Lostngone
2020-11-06 01:55:48 +0000 UTC
