New domain: www.Speed-Talk.com

The forum is currently running on the new domain and server. The old domain will remain active for a while to forward any (less frequent) visitors.
Update your bookmarks to https://www.speed-talk.com or
https://www.speed-talk.com/forum/

Coil triggering

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
Fireonthemountain
Pro
Pro
Posts: 226
Joined: Sat Mar 19, 2016 11:17 pm

Coil triggering

Post by Fireonthemountain » Mon Apr 15, 2019 3:12 pm

Normally triggering of spark in past days were from the grounding of the negative side or ground side of the coils. Tuner has suggest grounds the negative side of the TFI coils to the heads, for best spark with the MDS6. But is this also the case with a points or Unilite trigger in the distributer, and with the older coils such as a Mallory Promaster, that the negative on the coil goes to the heads with the MSD6???

Coloradoracer
Expert
Expert
Posts: 525
Joined: Sun Mar 21, 2010 9:48 pm
Location: Lehigh Acres, FL.
Contact:

Re: Coil triggering

Post by Coloradoracer » Mon Apr 15, 2019 7:33 pm

No. Two different ignitions. The Mallory is an inductive ignition and MSD is capacitive discharge. Two very different animals.
Mark Goulette
Owner/Driver of the Livin' The Dream rear engine dragster
Speed kills but it's better than going slow!
http://www.livinthedreamracing.com
Authorized Amsoil Retailer

User avatar
modok
Guru
Guru
Posts: 2150
Joined: Sun Jun 06, 2010 1:50 am

Re: Coil triggering

Post by modok » Mon Apr 15, 2019 7:44 pm

Fireonthemountain wrote:
Mon Apr 15, 2019 3:12 pm
Normally triggering of spark in past days were from the grounding of the negative side or ground side of the coils.
Right.
The negative side of the coil was the trigger, and it "fired" through the positive terminal, strange as that is.

"Make sure the coil is grounded" is a joke we use to spoof the new guy.
Like, go get the brass magnet.
and always shake the brake-clean until the ball rattles.

Now, far as how you wire a coil for the CDI, I don't remember.....
Will have to look that up, in the wiring diagram
But I SUSPECT, tuner is correct, that with a MSD 6al, the ground side of the coil, is actually ground!

Fireonthemountain
Pro
Pro
Posts: 226
Joined: Sat Mar 19, 2016 11:17 pm

Re: Coil triggering

Post by Fireonthemountain » Mon Apr 15, 2019 8:41 pm

modok wrote:
Mon Apr 15, 2019 7:44 pm
Fireonthemountain wrote:
Mon Apr 15, 2019 3:12 pm
Normally triggering of spark in past days were from the grounding of the negative side or ground side of the coils.
Right.
The negative side of the coil was the trigger, and it "fired" through the positive terminal, strange as that is.

"Make sure the coil is grounded" is a joke we use to spoof the new guy.
Like, go get the brass magnet.
and always shake the brake-clean until the ball rattles.

Now, far as how you wire a coil for the CDI, I don't remember.....
Will have to look that up, in the wiring diagram
But I SUSPECT, tuner is correct, that with a MSD 6al, the ground side of the coil, is actually ground!
Ok thanks...I will, if no one says for sure, just test it that way for a few seconds. How bad can the explosion be :lol: I think I will use my weakest coil for the test.

Post Reply