Wastespark ignition (7mgte)

[kemicalx]

Ey all,

Just a quick one,

When the waste spark coils (paired as such 1-6, 3-4, 2-5) on a 7m fire do both outputs on the coil fire at the same time?

For example for coil 1-6, every 4 stroke roation of the engine both sparkplugs 1 and 6 will have fired twice?

I ask because judging by my timing light, output 1 only fires once every 4 strokes while 6 fires once every 2 strokes.

Is this normal?

[JustCallMeOrlando]

Yep, for each full rotation each spark plug will fire twice, once on ignition, once on exhaust.

[kemicalx]

so your positive both outputs will fire twice? not just the cylinder at the oposite stroke?

[JustCallMeOrlando]

There are 3 outputs, each output has two spark plugs attached to it. Think of it that way. Each output fires twice per revolution.

[kemicalx]

so any ideas what could be wrong with mine?

[mic*]

Badly gapped plug?

The plug firing in the "waste" environment should be a very minimal spark. I dunno whether your timing light should pick it up or not... Ie if it is a gap thing i cant tell you whether one is too far or the other is too close...

[CrUZida]

The plug firing in the "waste" environment should be a very minimal spark. I dunno whether your timing light should pick it up or not... Ie if it is a gap thing i cant tell you whether one is too far or the other is too close...

Huh??
Are you saying that the coil knows which one is on the waste stroke ?

[mic*]

Huh??
Are you saying that the coil knows which one is on the waste stroke ?

No,

Was just a guess coz ive been lead to believe that the waste environment is much less conductive becuase of the exhaust gases and lower pressure, so the spark is much weaker. Is this not true Cruz?

[CrUZida]

Electrically that would be true, I'm not sure how much it would happen in the real world though.

[ra23celica]

Checked number one plug lead?
Checked that number one spark plug is OK?
Checked that spark is not escaping somewhere else in the system rather than the gap when the cylinder is under compression stroke pressure?

[kemicalx]

I don't see how the exhuast stroke spark could be any weaker, as Cruz pointed out, the coil packs know no diferent, and if both outputs are suposed to fire at the same time every 2 strokes of the engine, they would both have to be equally powerful yes?

[ra23celica]

Yes, they would be equally powerful, after all, each spark is coming from the same coil pack. Its just when the spark gets near/to the cylinder, it arrives to completely different conditions during the 4 stroke cycle.

[JustCallMeOrlando]

I'm pretty sure the spark on the wasted part of the cycle is weaker than the other. I'll have a look for it, there is a reason.

[chris davey]

Yeah, that is what I read on www.howstuffworks.com when I was reading up on wastespark. I was going from sequential to waste and by my reasoning I thought I would have 50% of the spark strength. They said that this was not the case but can’t exactly remember why.

[CrUZida]

If it is weaker, it has to be a chemical/electrical thing.

The coil itself will have no idea which one is in waste, and which one is in compression