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GS550 Sparkplug cap

  • Thread starter Thread starter kokar
  • Start date Start date
kokar said:
I have a better idea Steve !
Click to expand...
Nice setup.
icon_thumbsup.gif


It's kind of hard to see how the plugs are grounded. Is that piece of angle they are threaded into grounded to the plate that everything else is on? Or do you run a separate wire?

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Steve that is a little tricky,
i figured out from the service manual ,
ignitioncoil0.jpg

a simplified schematic is this
ignitioncoil1.jpg
 
Yeah, I got the book part, I was wondering about your test setup. How are the plugs grounded?

After watching the video, I am guessing that they are threaded into metal angle stock, which is somehow fastened to a metal base plate, which is connected to everything else. Correct?

.
 
OK, enough of the pictures and diagrams, let's talk nuts and bolts.

I see that the spark plugs are threaded into something that looks like angle aluminum. Is that aluminum angle bolted to a metal base plate?

It appears that some other parts are also mounted, like the coil. It is not necessary for the coil to be mounted to a ground point, so that is irrelevant.

I see other parts, like your ignitor setup. Surely that has power going to it, both positive and negative wires. Does that negative wire also connect to the metal plate that is holding the angle aluminum and the spark plugs?

.
 
Steve said:
OK, enough of the pictures and diagrams, let's talk nuts and bolts.

I see that the spark plugs are threaded into something that looks like angle aluminum. Is that aluminum angle bolted to a metal base plate?

the purpose of the angle aluminum is to hold the sparkplug in safe place
and electrically connect the two sparkplug

It appears that some other parts are also mounted, like the coil. It is not necessary for the coil to be mounted to a ground point, so that is irrelevant.

this setup is from an old project !
click --> http://www.youtube.com/watch?v=hOUxB73b-WE

I see other parts, like your ignitor setup. Surely that has power going to it, both positive and negative wires. Does that negative wire also connect to the metal plate that is holding the angle aluminum and the spark plugs?

the connection with the ground is not affect the circuit
I think the following video will answer all your questions

.
Click to expand...

the video will be with you in a few minutes
 
Just watched both videos, they raised more questions than they answered.
icon_shrug.gif


I see two spark plugs that have what appears to be some bare copper wire between them. That is great, but where is the ground connection that simulates the engine that the plugs normally screw into? You have to have a complete path for an electrical circuit. You have current coming through the plug wire and jumping across the gap, ... to ... what?.

In your earlier video, the plugs appear to be screwed into some angle aluminum, and that angle appears to be resting on something that looks like a metal plate. My question all along has been "is the angle bolted or otherwise firmly attached to the metal plate to complete the electrical circuit?"

I am happy that it works for you, sorry to bother you so much, I'm outta here. :o

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tkent02 said:
I think that's what he's asking for.

I would guess 5K, but that's just a guess, haven't bought any for a while.

CAll Z-1 they have the right ones.
Click to expand...

When I read it I missed where he said "cap" in the actual post and my brain clicked into the assumption that he was asking which level of NGK to run (ie platinums and all the crap).

OP sorry about that. Until I run out of Vicodin i'm blaming that.
 
Steve said:
Just watched both videos, they raised more questions than they answered.
icon_shrug.gif


I see two spark plugs that have what appears to be some bare copper wire between them. That is great, but where is the ground connection that simulates the engine that the plugs normally screw into? You have to have a complete path for an electrical circuit. You have current coming through the plug wire and jumping across the gap, ... to ... what?.

In your earlier video, the plugs appear to be screwed into some angle aluminum, and that angle appears to be resting on something that looks like a metal plate. My question all along has been "is the angle bolted or otherwise firmly attached to the metal plate to complete the electrical circuit?"

I am happy that it works for you, sorry to bother you so much, I'm outta here. :o

.
Click to expand...

I think I see the confusion here...

The plugs only have to be electrically connected to each other via whatever they're screwed into. This is true both in this test setup and on the bike.

Have a look at the ignition diagram. Everything on the secondary side of the coil is a completely separate circuit from everything else on the bike. When the primary coil loses power, the magnetic field inside the coil collapses. This collapsing field induces a (high-voltage) current in the secondary coil. The current flows down from the secondary coil to one spark plug, jumps the gap, flows across the cylinder head (or in this case, the metal bar), jumps the gap of the other plug, then back up into the coil. The concept of "ground" is purely semantic in this case. I prefer to think of it as the cylinder head just being one big beefy (and convenient) wire bridging the two spark plug bodies together.

kokar: it looks like you're building your own igniter circuit? Nice job! Are you by any chance a ham as well?
 
You are absolutely right about the circuit :)
I never been involved with HAM Radio.



.
 
Interesting, I did not realize that the two spark plugs were completing a local "ground loop" to complete the secondary circuit.
Eli provides a more detailed explanation.
Kokar, minor recommendation; change the ground symbol for the two plugs to distinguish between the ignitor circuit ground that connects to the battery (-).
Nice work, looking forward to the finished ignitor products.
 
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