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Grounding Design

Practical Motorsport Wiring - Club Level

Relevant Module: Practical Wiring Harness Design Skills > Grounding Design

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Discussion and questions related to the course Practical Motorsport Wiring - Club Level

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Hi Guys. I have a question about "Grounding Design video Module" of "Practical Wiring - Club Level" section.

In the Video Zac is saying:

When the coil fires, the secondary winding current travels to the spark plug either via an HT lead or a direct connection for a coil on plug setup, and then jumps the gap from the centre electrode to the ground strap of the spark plug and heads out into the engine block.

06:17 From here it needs to make its way back to the coil secondary winding, as the current does flow in a closed loop.

06:23 This is why the majority of direct fire internally ignited ignition coils will have a pin that connects to one side of the secondary winding.

I can't understand this scheme, The path of flowing current and the point where that pin is connected to the secondary wiring of the coil. can we discuss it? I will try to attach the scheme of common coil

""

Here is a small piece of ECU VQ30DET Scheme with the ignition coil on it. So, two questions:

1. Where is exactly that pin which is connected to the secondary wiring?

2. What is the direction of current flow in the secondary wiring? I don't understand the following:

06:17

From here it needs to make its way back to the coil secondary winding, as the current does flow in a closed loop.

Please help, sorry if i'm being stupid here

I think I found it (1st attached)

[img="blob:https://www.hpacademy.com/0a33e208-0057-4058-8211-cd2b2ce448d7" alt="" alt="" ]If the picture is correct, then my scheme is going to be following (2nd attached):

Is this correct now? Please confirm 🙏

Attached Files

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