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Old 08-12-2011, 02:07 PM   #1
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Mototronics/Mercury ING-1A ignition coils

Thought this might be better off as it's own thread. Somebody asked about coils for FI use on the RX-8 that work at the OE dwell settings.

Quote:
Originally Posted by TeamRX8 View Post
Just build the same thing using Mercury IGN-1A coils, they handle high rpm applications better too

Let me know if you need a PnP harness
Quote:
Originally Posted by MazdaManiac View Post
7ms nominal dwell to the same output voltage as the BHR coils at 5ms.
So, uh, no.

Since you only have 6.5ms between spark events at 9k, that would probably not be a great choice.

At 3.5ms, the 1a's have slightly over half the output of the BHR coils at 3.5ms (OE dwell).

They also require more current than I would be comfortable putting through the 18ga wires on the RX-8 harness (were you to run them at 6.5ms).
Your numbers are off compared to other data I have.

Maybe you can explain why they don't misfire at a 3mS dwell setting until boost is higher than anything you will ever see on a Renesis engine ...
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Old 08-12-2011, 03:37 PM   #2
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thanks Mark--this may be exactly what I have been looking for. I will study this , this w/e.
I havent had a chance to look at the pin out etc--but what connector does this coil use?
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Old 08-12-2011, 04:20 PM   #3
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It uses a 5-pin, in addition to the three OE wires there is a common secondary groynd like the GM coil. The 5th pin is for a common switched 12V power wire. This is where it differs from the OE and GM coils.
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Old 08-12-2011, 06:24 PM   #4
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May I contribute, here?

I am not sure about the specific output versus input dwell time (but the RX7 guys have a bit to say about it), nor how it directly compares to other available coils but here is the AEM version of that coil and the electrical specs are listed.

http://www.aemelectronics.com/high-o...mart-coil-1240
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Old 08-12-2011, 06:41 PM   #5
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Your numbers are off compared to other data I have.

Maybe you can explain why they don't misfire at a 3mS dwell setting until boost is higher than anything you will ever see on a Renesis engine ...
Interesting assertion.

I don't get misfires on the BHR system at 10 PSI on a 35r with stock dwell.

I guess it depends on timing, AFR and other stuff.

My main issue at this point is that, even if they could ignite water, they still draw too much current for the OE harness when the dwell is set to anything that makes them any more powerful than what we use, meaning there would have to be additional wiring to make them work.

Not that this can't be addressed (my original system had an external power harness that we deleted from the BHR system because it wasn't necessary and complicated the otherwise P-n-P nature of the kit).
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Old 08-12-2011, 07:03 PM   #6
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It's an open forum. Anyone is free to post.

AEM has these rebranded with their name, but it is the same coil. Their price is higher or at least I have never seen them priced lower in public.

We are talking about using them at 3 ms, not 6.5ms as in your example. The output is just one spec. It is not the end all reason to say yea or nea.


.
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Old 08-12-2011, 08:06 PM   #7
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The output is just one spec. It is not the end all reason to say yea or nea.


.
Oh? Then what is? Color?
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Old 08-12-2011, 10:05 PM   #8
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maybe cost and the ability for us boosted guys to use them with the oem dwell settings?
Those are big selling points for me.
base dwell for this coil is 3ms.

Mark thanks for the pin info.

In reading it seems that some rx7 folks have been using these for "awhile"?
I do believe they where using mostly the dumb kind.
NP's that I can find?
I tried calling AEM tech today--but the famous busy signal was omnipresent.
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Old 08-12-2011, 11:05 PM   #9
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base dwell for this coil is 3ms.
There is no such thing as "base dwell".
There is only minimum and maximum dwell.
These coils at minimum dwell produce less output current then the Yukon-style coils at the same dwell. Same is true at 3.5ms (OE Renesis dwell).
They don't start to shine until 5ms and are really kicking *** at 7ms.
They have a maximum dwell of 9ms or so before they tip over.
The Yukon-style coils saturate way before that and are cut off automatically by the ignitor (as opposed to overheating like the stock coils).
Since you only have 6.6ms between combustion events on a rotary motor at 9000 RPM, you are limited in how long you can dwell the coil (about 5.5ms).
At 5.5ms, their output is identical to the Yukon-style coils.
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Old 08-13-2011, 07:08 AM   #10
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Nevermind that they have been successfully used on 2 bar rotary FI engines @ 3 ms without issue

They simply don't need to be run at those high dwell settings and are more consistent and reliable as a result. Most have used them in the 2.5 - 4.0 ms range on very high output FI engines for years.

A standard GM HEI sparkplug wire connector is another positive

I still say your comparison numbers are way off.
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Old 08-13-2011, 07:41 AM   #11
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good info Team. I too, in reading have found where some folks have been using these coils on high output engines for some time. So far I have not found a downside?

On the base dwell thing? I was just repeating what was listed in the tech section describing the coil.
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Old 08-13-2011, 02:36 PM   #12
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Another point is that the wiring may only be 18 Ga. but the power signal is also only 5 volts. It potentially can handle more amps than was suggested earlier. Of course other factors and conditions can apply as always. At 3ms they will pull 4.5A which should not be a problem.
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Old 08-13-2011, 03:02 PM   #13
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Another point is that the wiring may only be 18 Ga. but the power signal is also only 5 volts.
That is incorrect.
The power signal is 12v.
The trigger is 3v.
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Old 08-13-2011, 09:31 PM   #14
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Since I was using the amp specs for 12V service it's a minor, but worth noting detail. I did mean to say "trigger" rather than "power"
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Old 08-14-2011, 05:31 AM   #15
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I have no business in this thread other than to learn and say this is somewhat refreshing!
Swear I thought a group hug was gonna break out!



Then, I caught up on the Raceroots, Scotts, and sadly the BHR thread(where went off on unwarranted tangent and all hell broke loose) after my install yesterday.

That is all............I shall retreat to the shadows.
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Old 08-14-2011, 11:00 AM   #16
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thanks Mark--




Does this mean he's not the unknown auto-xr any more?
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Old 08-14-2011, 11:29 AM   #17
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one thing stands out about this coils. They have a longer spark duration than others.
hmmmmmmm.
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Old 08-14-2011, 11:52 AM   #18
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Does this mean he's not the unknown auto-xr any more?
It has shown up in various threads from time to time....................don't worry, that bag is a permanent fixture.
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Old 08-14-2011, 01:41 PM   #19
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Quote:
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one thing stands out about this coils. They have a longer spark duration than others.
hmmmmmmm.
Which others?
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Old 08-14-2011, 02:22 PM   #20
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one thing stands out about this coils. They have a longer spark duration than others.
First of all, no they don't.
At nominal dwell, the duration on the A1 is actually shorter than the Yukon-type coils (about .5ms).
Second, long spark duration simply means that the current delivered is done so over a longer period of time which means, effectively that you have ceded some control over flame front to a longer ignition kernal. Which is, essentially, bad.

In short, you want all of the current right up front in the smallest possible kernal evolution time before propagation.
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Old 08-14-2011, 02:48 PM   #21
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Second, long spark duration simply means that the current delivered is done so over a longer period of time which means, effectively that you have ceded some control over flame front to a longer ignition kernal. Which is, essentially, bad.
In reading the electrical characteristics of the Mercury/AEM coils I think there is something to be said about using the data point of milliJoules versus milliAmps with regard to the time factor. I wonder how the various coils would compare if the argument were a direct comparison of the various characteristics.
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Old 08-14-2011, 03:34 PM   #22
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The best comparison is going to be on the bench.

At some point, if it seems worthwhile, I'll put them side-by-side.
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Old 08-14-2011, 03:54 PM   #23
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the ign A1 coil list a arc duration of 3.2 ms with a 3ms of dwell
the ls2 ignition coil lists the arc duration of 2 ms at 5 ms dwell
posting as stated on their each perspective specification sheets


millijoles and milliamps topic could make for a very long thread--rather not?
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Old 08-14-2011, 04:27 PM   #24
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Quote:
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the ign A1 coil list a arc duration of 3.2 ms with a 3ms of dwell
That is incorrect (not that it matters because you didn't reference nominal voltage).
AT 3.5ms, the A1 has a spark duration of just over a millisecond.


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the ls2 ignition coil lists the arc duration of 2 ms at 5 ms dwell
Also incorrect.
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Old 08-14-2011, 06:37 PM   #25
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Quote:
Originally Posted by olddragger View Post
the ign A1 coil list a arc duration of 3.2 ms with a 3ms of dwell
the ls2 ignition coil lists the arc duration of 2 ms at 5 ms dwell
posting as stated on their each perspective specification sheets


millijoles and milliamps topic could make for a very long thread--rather not?
The BHR Ignition System does NOT use LS-2 coils.
Lemme contact our manufacturer for all the specs so we can at least continue this conversation with accuracy.
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Old 08-14-2011, 06:37 PM
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