Jeff20B

iTrader: (13)

Ah, so it's just a handful of people using FC Leading coils with no split in so called 'waste-spark' mode then?

You guys know what I mean when I mention 'waste-spark' on an FC right? It's where both Leading plugs fire at the same time every 180º of eccentric shaft rotation. Each Leading plug sparks at 0º and again at 180º (give or take according to advance/retard). Well, why not run one and three rotor engines that way? My old two rotor engines run great that way.

I think I've mentioned this before and got mixed results. So what do you guys think nowadays? Good idea if I can actually pull it off?

RETed

Technically, it's not "waste spark".

I dunno if there is a term for it, but we normally call it "simultaneously firing..."

Single rotor - sure.&nbsp 3 rotor?&nbsp Not possible - if you map out the rotor positions versis ignition (TDC) firing, you'll understand why.&nbsp The 2 rotor just happened to have the right geometry to wastespark the leadings.



-Ted

Jeff20B

iTrader: (13)

Then I'd like to coin a new term: simulspark. As an example, you've probably heard of simulcasting a TV show's audio in stereo on an FM radio station before stereo TVs became more common. These days, SAP allows a seperate audio program to be listened to as well as the original on the same channel. It's mono though, but it's still called simulcasting. Anyway, why not shorten "simultaneously firing..." to simulspark? Short and sweet.

Following that train of thought, what is the best term for when a single Leading spark plug fires once at 0º and again at 180º? I've always called it "dual Leading sparks" because it's descriptive enough, although a little long to type. If a single rotor engine is running this way, it can't really be called simulspark(s) because there is no other Leading plug firing at the same time.

I'd like to coin another new term to describe "dual Leading sparks" regardless of how many rotors the engine may have. I've come up with a couple that are pretty short.

How about 0/180? It's only five keystrokes, but not descriptive enough for newbies. Or maybe 0/180sparks? Now that's a little better. It's about the same length as simulspark and quite usable to describe dual Leading sparks on one and three rotor engines.

By the way Ted, I've built a 20B distributor that should run the Leading plugs with 0/180sparks and the Trailing plugs will get a 15º split (after each '0' Leading spark, but never after each '180' spark because that would be disasterous). I say it should because in theory, it does. I've just got to test it in the real world to be sure. It's all direct fire too. I'll get to have a naked dizzy cap.

So am I on the verge of accomplishing the impossible? Or was it like a trick to get me to admit to my little ignition mod? Yes I realise that you can't run a 20B in true waste-spark mode, but I've gone and done the next best thing.

j9fd3s

iTrader: (3)

i'm using 3 fd leading coils and an fd ignitor
turbo3 and george samuels are using tec's
the k2rd car is running 6 of those nippondenso/chevy coils and an e6k.

mike

RETed

Sounds like a variation of the 12A modified Racing Beat dizzy?


-Ted

Jeff20B

iTrader: (13)

That RB dizzy mod kit was on my mind all throughout my brainstorming sessions.

I'm just glad I stuck with my original idea of running a 20B with 0/180sparks, especially now since I just recently found out that no one has ever done it before. I bet it'll make the engine sound different than what we're used to. We all know the 20B has the best sounding exhaust note, and most of us know how a two rotor engine sounds different with 0/180sparks than it does with single Leading sparks (like all stock '86 and later engines vs all stock '85 and older engines). I emidiately noticed a difference in the sound of my old style four port 13B the first time I ran it with 0/180sparks, especially at idle (I kept checking the tach as the engine sounded like it was idling too high ).

I'm extremely curious to hear what a 20b will sound like with 0/180sparks.

Speaking of the RB dizzy mod, I think peejay was going to try some sort of variation of his own (or more like a direct ripoff). Even Rob Golden did something like that years ago just to see if it could be done. He also said 0/180sparks aren't necessary if the AF mixture is good. However, as soon as it starts to go away from stoich, the extra spark does help out. My 13Bs run much better with 0/180sparks due to their mid '70s carbs being old and adjusted somewhat less than perfect (what is perfect anyway?). My 20B project will be NA with a carb. Might as well benefit from that extra spark, right?

Jeff20B

iTrader: (13)

Anyone else have any input?

Kurgan

Comment: I like fuel injection and direct fire ignitions.
Comment: Good luck with the distributor stuff.

93 R1

Kurgan,

I can get Toyota parts at cost+10%. Let me know exactly what you need.

Justin

Jeff20B

iTrader: (13)

Cool, two comments hehe! Thanks man!

Kurgan

Do the Toyota Coil on Plugs have their own ignitors? If so, could you please PM me a price for a set of their coils (I need all 6).

Thanks a lot!
Nick