Flying_solo

iTrader: (7)

I'm ready good and bad things about the Mercury Coils in Wasted spark for adaptronic and seen several Dwell # thrown around such as 4.5ms.

Here is what got me wondering if this is a bad idea
wasted vs direct fire on rotary engine

Does anyone else here run wasted spark with the adaptronic and if so, what Dwell are you running?

Thanks!

AdaptronicAus

If you follow the datasheet for the Mercury coils, you can't run them wasted spark on a rotary.

They specify a maximum continuous duty cycle of 40%. In direct fire, this means a maximum dwell time of 3.0 ms at 8000 RPM. So in wasted spark, this would mean a duty cycle of 1.5 ms at 8000 RPM if you want to follow the spec.

I'm sure many people are running them at a higher dwell time than this (eg 3 ms wasted spark), and it will probably work fine, but this doesn't meet our core value #6, Encourage the Right Way (ie, if people want to run Mercury coils, we should tell them that they should run them direct fire, rather than taking the cowboy approach of saying "Yeah, just run em, I do that on my car and it's great", without having done the proper testing to show that they actually don't overheat).

I'm not going to argue with the engineers that put a 40% duty cycle limit on their own product; I'm sure they know its limitations better than we do.

So I'd recommend direct fire for this coils.

Hope this helps!

Flying_solo

iTrader: (7)

Hey Andy, I'm sequential twins and would love to go direct fire. Do you have any clever ways to free up an input and still be sequential? I posted this question on the adaptronic forum a few weeks back. I'm also not running an OMP. So, I'm wondering if I can convert one of the unused outputs on my PNP via relay or something clever and stay sequential and have my cake er direct fire as well?

AdaptronicAus

Hi mate, sorry that we haven't got back to you on our forum yet - Mark is a little bit swamped and I'm trying to get this latest SW / FW released.

Yes, you can definitely do that. The outputs that drive the OMP outputs are only low current so they can't drive the precontrol solenoid directly, but as you suggested you can do it with a relay.

I would pick an output, eg aux output 7. This comes out on pin 4J. Connect this wire to pin 85 of a relay.
Connect pin 86 of the relay to ignition power (1B).
Connect pin 30 of the relay to ground (4A)
Connect pin 87 of the relay to the precontrol wire (goes to pin 4V)

Select "OMP 1" output (the 2nd last one in the Aux output list) as "Precontrol, inverted"

And you'll be set

Flying_solo

iTrader: (7)

I can wait for good news like that! You guys should do a FAQ about that. I was all depressed about no direct fire. I'll give this a shot.

Thanks!