Hey your right, I never once thought about how a spark travels
Dastunb120 has never once said it sounds crap.
Sparks dont follow wires. Sparks travel the easiest way to ground. Bare leads with engine grime on them are a good conductor. Its easier for a spark to run down a lead and ground on the head - than it would be to jump a spark plug on the compression stroke.

Been following this for awhile. Nobody seems to have thought about how the spark travels, Id expect that alot of the spark is now happening in the dizzy cap thats why it sounds crap at idle, the spark will take the easy route so if there is wires for it to travel on instead of jumping it will tke the wires.

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I was always of the belief that twin plugs were used to ensure that they fire the lean mixtures that are used in modern engines in an attempt to meet emmission standards.

I guess that if the combustion chamber was the right shape, it would need only one plug. After all, others manage it.

So what rotor button are you using??...the way i see it the standard a series rotor button will be too small because the diameter of the dizzy cap is larger the spark will not be able to jump that far...

The way I see it if it fires it fires. No need for massive spark really. Sure it helps with starts, a bit more response and probably better fuel economy/effiecency but it is by no means the sole factor to increase performance on a motor. Id think just a high energy system would be more effective than this system. Also isnt the idea of twin spark (usually twin spark plugs) to ignite more of the fuel at once or almost simualtaneously. Even if yours fires 1/10 of a second after, it will basically be firing into exhaust gas. Think about that. Im sure that the flame would have pretty much ignited all the fuel by then and whats left unburnt probably wont be enough to be ignited again by a spark.

Most engines today that run twin plugs is only to pass emissions as their combustion chambers are ineffiecient. Not as in performance wise or anything (eg. mighty hemi) but in terms of burning all the fuel in the chamber.

But hey your giving something new a go and if it works well you will be praised. But until then i too am skeptical. That much money today goes into research for motor cars and they still have to do the same things today as they did 50odd years ago. Head work, big valves, cams compression or pressure.

I think that if combustion hasn't been fully established by the time the piston is geting to be half way down
the bore, then hitting it with another spark isn't going to save it.

I wonder if there is any good reason why this system has not been used before, after all, some
highly tallented engineers & racers have had almost a hundred years to think of this concept.
Hmmmm, I wonder.

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Things like this is what makes me skeptical. It doesnt sound very well thought out. You gave your reason for why you chose 2 sets of A series leads in the other thread and also like above you didnt think the leads could handle carrying an extra spark. But yet 1 Aseries coil lead is still used to carry 4 extra sparks to the dizzy?

And it does sound like a V8 at idle.
I would have thought if it could now idle below 500rpm, it would infact idle smoother and be less noticable how many cylinders it had. (thinking V8 idle means like a lumpy v8 sound)
I dont see how a well tuned engine would give any evidence of change in idle with this extra spark. Inreased rpm, more fuel and big boost I could see possibilities of change,if the ignition timing of primary and secondary sparks was controled independant of each other.
At the moment I put the V8 idle qualities down to - bad timing which as rpm increases becomes less noticable due to the engine making enough tourqe to ovecome the poor ignition timing.

Thats just thoughts. Only you know how it runs firsthand.

yer grunt hunter i think you are right. seems like its quite a gap between them but when i looked at it when it was running the secondary sparks is only like a tenth of a second after the primary but it does make a noticeable difference. the timing is only set to factory but with a bit of tuning id say it would have a greater effect if the timing if advaced more for the secondary spark to have a greater effect

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Took me a couple of go's to get my head around it (see edits in my last posts), but I dont reckon that's right. the dizzy turns at half engine speed, so 45 deg on the dizzy is 90 deg on the motor....... which means that your secondary is firing at 83 deg ATDC when the piston is almost halfway back down the bore.

i did actually have this setup goin with just my webber and stock manifold but since then im trying to fit a turbo. it does sound like a v8 at idle but im not to sure on the acuracy of the tacho, the switch on the back has been broken and i can tell wat seting it is on, but it shud be on 8. the timing has been set to factory 7 deg. for primary and secondary shud be somthin like 38 so it fires when the piston is just on the way down. the engin bay was a little dust when i took the piks but the dizzy cap is clear. the reason for the two leads was that i thought just the one lead might get really hot with so much power goin thru it and joint them at the plug was the easist way