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Old 02-05-2017, 12:04 PM   #51
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What I posted is correct. If your findings match what I have been trying to teach people, you have it right
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Old 02-06-2017, 03:10 PM   #52
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What I was getting at was that the opening post here describes the "mod" being done to the front coil. That is the wrong coil to switch because it is NOT the afterburning coil.
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Old 02-06-2017, 07:35 PM   #53
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No it's much worse than that. The entire thought process is insane because the original posters of these modifications don't truly understand how the dual plug system works, > They are ignorant of the operation. They thing because you hear wasted spark, that is because of the dual plugs. It is not. Any and every ignition system that uses coils sharing cylinders work under the wasted spark system. It's got nothing to do with a dual plug ignition in a 2.3 Ford engine.A 1960's 4 cylinder motorcycle engine uses a wasted spark ignition. It common and these people just don't understand, It is nothing like they try to say it is. So, waste no more time on this subject seriously.
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Old 02-02-2019, 08:03 PM   #54
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If one coil is dead can I use this the go on?
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Old Today, 12:29 AM   #55
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I been turning wrenches for at least a week now. And I am of the opinion as Pete stated in different words. Most of you folks dont read much. Therefore ignorant as to how the system works. FYI, I think the second plug fires 10degrees (cr) after the 1st one.

cr=crank rotation
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Old Today, 08:21 AM   #56
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This mod does nothing, just look at the wiring diagram:



The coil for the secondary plugs can be fired at different angles relative to the primary plugs, as determined by the ignition module. Each coil pack is a separate wasted spark system. Swapping plugs on a coil pack doesn't change which plug is primary or secondary, it only changes which is the forward and reverse plug. That has no effect on performance, only which plug gets its center electrode worn out faster.

Dual ignition is used on engines with less than optimal combustion chamber shapes where the flame propagation time is too long to allow complete combustion. The Mazda rotary had a combustion chamber shaped like a squashed banana, so it needed 2 plugs. They usually fire pretty close together because the idea is to get the fuel burned quickly, leaving less unburned fuel. That reduces HC and increases power because fuel that does not burn makes no power.

Even if you did swap primary and secondary plugs the chances that this would work better than what the engineers developed on dynos is rather small.

I don't even have one of these engines anymore, but it was a damned good engine on my 1990.
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