direct fire
 

I need some info on converting my fb to direct fire. Anyone know any good titorials on it.

Thanks, this is perfect

that's great, glad someone made the diagram for the GM modules. here's the one using the stock igniters.

http://www.geocities.com/cd23c/dlidfis.html

It looks like someone did his homework. Just one question: are you sure the pickup green wire actually goes to the G terminal on the HEI ignitor? I just purchased two more of those white HEI ignitors the other day to install on another rotary project, and I could have sworn the red pickup wire goes to the G terminal. I'll have to bench test an ignitor some time today to confirm (I was going to do this before installing them anyway, but this is a good enough excuse, hehe).

The rotary B2000 with those three HEI ignitors (as seen in that link above) has been sold back to its previous owner, so I can no longer check its pickup polarity. No worries though. :)

I just bench tested an HEI ignitor with a spare pickup (it's not installed in a distributor) and a speaker. The G terminal seems to go to the green wire. It triggers the same as a J-109 when green is on G and red is on W.

On a related note, I tested a J-109 and a J-105. If you've ever looked at the reluctors of '80 distributors compared to '81-'85, you'd see the '80 style looks backwards compared to the later style. Since they both spin counterclockwise, it can be assumed that the J-105 triggers opposite of the J-109. Then when I hooked a speaker up, they both triggered when the speaker's cone was pushed the same direction. In this case, the green wire was hooked to the speaker's (+) and the red to the speaker's (-). It would trigger when the cone was pushed downward.

As for the HEI ignitor on the speaker, it would trigger when the cone is pressed downward when the G terminal is hooked to the speaker's (-) and the W to the (+) terminal.

The next test is to wire it up to a spare dizzy and spin it the correct (counterclockwise) direction and see which direction the HEI ignitor wants to be hooked up.

Testing with a dizzy spun by hand was inconclusive. It triggers in each direction with all three ignitors. I'm just going to trust my test results from the spare pickup and hook green to G and W to red, just like I must have done last year before I hooked up the HEI ignitors to the B2000. That conversion worked perfectly (timing was correct and all that), so I'll just go with it.

An ignitor fires on a negative going pulse, which you will get whichever way you spin in. You really need a scope to show which is correct.

I agree. Hey, I think the J-105 ignitors may fire on a positive pulse. Their reluctors have a profile opposite of '81-'85, and I just tested one and got it to trigger a coil the same way '81-'85 and HEI ignitors do by hooking the pickup wires backwards. Pretty weird, huh?

if you hook up the wrong wires you will know as soon as you try to start it, it will run, but not rev up without popping and backfiring, and the timing light will show you 30 degrees out of time