K-Tune

iTrader: (26)

any point to it? anyone ever try it?

what purpose does the distributor serve at this point haha.

if nobody has done it, i'll do it for the heck of it just to see if it works.

i was thinking maybe..either 2 stock coils, or 2 msd blasters.

feedback appreciated

Static

waste of time and money... you wont gain anything from it...

mwatson184

Waste of time and money because you will be rebuilding your moto. There are reasons nobody does this:

You can use direct fire /wasted spark on the leading plugs due to the position of the plugs vs the position of the rotor when they fire. The wasted spark fires during the exhaust stroke when direct fire is used on the leading plugs.

If you were to direct fire using the trailing plugs, you would fire the plug during the intake stroke of the next cycle. That is bad news.

FC's do direct fire the trailing plugs, but they don't use a wasted spark on the trailing side.

Marques

peejay

I have done it, accidentally. Detonation at 1/3 throttle is an... odd... experience. Especially in an N/A.

elwood

iTrader: (1)

I'm interested in this. The trick is figuring out a way to get each of the trailing coils to fire every other time the magnetic pickup is triggered. FCs use a crank angle sensor that is basically the bottom portion of an FB distributor. The signal from the crank angle sensor is processed by the FC computer, which sends a signal to the igniters and their adjacent direct fire coils. I don't know how the computer can determine which trailing coil to fire. If you find out first, please let me know.

elwood

iTrader: (1)

I'm interested in this. The trick is figuring out a way to get each of the trailing coils to fire every other time the magnetic pickup is triggered. FCs use a crank angle sensor that is basically the bottom portion of an FB distributor. The signal from the crank angle sensor is processed by the FC computer, which sends a signal to the igniters and their adjacent direct fire coils. I don't know how the computer can determine which trailing coil to fire. If you find out first, please let me know.

elwood

iTrader: (1)

I'm interested in this. The trick is figuring out a way to get each of the trailing coils to fire every other time the magnetic pickup is triggered. FCs use a crank angle sensor that is basically the bottom portion of an FB distributor. The signal from the crank angle sensor is processed by the FC computer, which sends a signal to the igniters and their adjacent direct fire coils. I don't know how the computer can determine which trailing coil to fire. If you find out first, please let me know.

elwood

iTrader: (1)

I'm interested in this. The trick is figuring out a way to get each of the trailing coils to fire every other time the magnetic pickup is triggered. FCs use a crank angle sensor that is basically the bottom portion of an FB distributor. The signal from the crank angle sensor is processed by the FC computer, which sends a signal to the igniters and their adjacent direct fire coils. I don't know how the computer can determine which trailing coil to fire. If you find out first, please let me know.

elwood

iTrader: (1)

I'm interested in this. The trick is figuring out a way to get each of the trailing coils to fire every other time the magnetic pickup is triggered. FCs use a crank angle sensor that is basically the bottom portion of an FB distributor. The signal from the crank angle sensor is processed by the FC computer, which sends a signal to the igniters and their adjacent direct fire coils. I don't know how the computer can determine which trailing coil to fire. If you find out first, please let me know.

elwood

iTrader: (1)

. . . And since I obviously couldn't figure out how to send this reply just once, my money says you'll figure this out first

Jeff20B

iTrader: (13)

I've figured it out, but I don't see a point to it.

Peejay, I once hooked up my trailing plugs backwards, mimicking trailing in the so-called wasted spark (ew, piston terminology) and the engine could idle, but just a little above idle it would buck and snort and all that good stuff. I barely could drive it around the block.

elwood

iTrader: (1)

I posted the question to the 2nd gen forum and got a good reply: http://www.teamfc3s.org/info/articles/demystifying.html

After re-reading your original post, you must realize that you will need at least three coils (one of them a dual coil) and three MSD boxes to do this. I still haven't figured out exactly how to trigger the trailing coils, but I'm thinking about it as a neat science experiment.

Also, BTW -- the trailing spark doesn't seem to be so important, so it probably isn't the best use of funds.

Jeff20B

iTrader: (13)

Good. You've stopped thinking with pistons on the brain. That's the first step. What I mean by that is a piston engine needs maximum power to each plug for good performance. Our rotaries only need excellent leading ignition power. Trailing can remain stock.