Weekly Waveform #9 - Ignition Primary Current and Voltage

[@Sevalecan]

Great. I'm debugging issues on a 2000 ram with a 5.9 magnum. I approve of your demonstration vehicle.

[@wyattoneable]

You have a great understanding of the system and you explained it well. It was easy to follow along.

[@jeffreystroman2811]

Turns ratio is same as voltage ratio And they both are the inverse to the current ratio Therefore power in equals power out Thanks for the information, been ages since I scoped an ignition coil (a step up with high current on primary and high voltage on secondary) and man do I need a refresher despite working electronics for decades.

[@Baitmakerz]

You might get a capture from my lawn mower 🤣 only thing at the dealer with a distributor is locked up waiting on engine

[@1b9e7n3z]

Thank you for sharing this valuable information, I appreciate very much this ability to explain these procedures so easily, I send you a greeting and I follow you with great interest, I wish you everything goes very well

[@renatoaquilino6259]

Amazing vídeo, Man... Cheers from Brazil

[@bellybell542]

What a beautiful explanation!!!!

[@saaaron5213]

The detailed scope setup is really helpful stuff... I wonder if that little bit of turbulence halfway down the burn line could be from a bit of carbon on a valve, letting some combustion gases flow past it?

[@alaautotonics4403]

Awesome video ,great explanation

[@faustogonzalez8397]

Outstanding thanks so much !!

[@diymisfit_Mechanic_UDX404]

oscillations, like snapping a rubber band :)

[@johnphillips1001]

Loved the video 😊

[@Dimi3sX]

Great Video and your description !!!! I am trying to get tach signal from my yamaha MT07 which has 2wire COP coils. The aftermarket I am using cant read at all through these 2 cables.But it works 9 times more Hz from crank sensor. If you could give any advice ,it would much appreciated.

[@ThePracticalMechanic]

If it’s a 2 wire coil you should have one power wire and one control wire. The tech is normally connected to the control wire and some tachs have “gain” adjustments to play with until the signal works for the tach. If you have a lab scope I would check the primary side of the coil and see what type of signal is present.

[@Dimi3sX]

@@ThePracticalMechanic I already know which is power and which control,but my tach cannot adjust itsself to read it at all,I now looking for some signal pickup amplifier maybe to send the right square waveform . Thanks a lot and keep on your great job!!!

[@meblake7359]

I have the Launch Torque 5 scope. If ignition primary can reach 50k volts, what ratio attenuator could I buy to protect my 100v max scope?

[@ThePracticalMechanic]

The primary can reach 400v on the inductive kick. Most use a 10x or 20x attenuator. The secondary wire is 50kv and you do not want to connect anything to that. The secondary side is the plug wire or coil boot side. If you are checking secondary you will want to use a secondary clamp that goes around the wire but doesn’t pierce it.

[@meblake7359]

@@ThePracticalMechanic Thank you. What about injectors? My Launch Torque has a limit of 100v.

[@ThePracticalMechanic]

@@meblake7359 most injectors rarely have a kickback over 100 V but some can be up to 200v

[@turbot6592]

My wave forms are small on primary coil. There not to scale. I'm on pico 7.

[@zodmansour3217]

Not clear on which wires u r probing Could not see under the coil

[@jeffreystroman2811]

One side gets +v constantly (battery) and the other is control switching from ground (allowing current to build up a magnetic field) to high z, causing the collapse of said field to fall onto secondary creating high voltage and therefore spark. So not the +12 side, he's hooking up to the points side or condenser side

[@picoboo5048]

I see you must have taken the wrong panel off the amp clamp when you were changing the battery. 😂 BTDT🤦‍♂️

[@ThePracticalMechanic]

Too many times🤣