|
|
|
Re: What is the purpose of the ballast resistor on my Dart?
[Re: Rick_Ehrenberg]
#1653619
08/15/14 12:00 AM
08/15/14 12:00 AM
|
Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
|
mopar
Joined: Oct 2010
Posts: 606
Montana
|
Quote:
The one point that may have been overlooked:
The system is basically designed for full output (and long life)with roughly 9 VDC supply. This is about what you have during cranking, and the ignition switch basically shorts the ballast during said cranking. When it starts, you release the key, the charging system resumes operation, battery voltage comes up to 13-14 VDC, and the ballast is again in series, limiting the current flow (and voltage at coil pos.)
Rick
This is basically the correct answer. It has nothing to do with "cooking the coil." Ferd, GM, or Ma could have easily used a 12V coil like many tractors use without a ballast.
It was done for STARTING
When you go out there, in the North Woods, at oh dark thirty to go to work, January 3rd, and it's below zero, the battery "might" put out 9V cranking. So ALL U.S. manufactures back in the day, used a starting bypass system for a hot spark during cranking.
Then, with engine running, the coil "sees" about that same voltage. It varies from 9-12V actually depending on RPM, points dwell, etc with the system running at nominal 14V
|
|
|
Re: What is the purpose of the ballast resistor on my Dart?
[Re: Yancy Derringer]
#1653620
08/15/14 02:49 AM
08/15/14 02:49 AM
|
Joined: Aug 2007
Posts: 6,095
Valencia, España
NachoRT74
master
|
master
Joined: Aug 2007
Posts: 6,095
Valencia, España
|
Didn't read all replies ( and I bet is not necesary ), but just a note.
With MSD you can keep or not the ballast. If you want to get your system back to stock look and work ( with stock or HiPo Module ), would be easier keep it, instead hack up everything.
MSD would use the coil wire ( the one coming from ballast and the one they advice to use in fact ) to be turned on or off from ign key, so a small ~9 volt signal is enough to keep it on, and ballast will be cool anyway ( not much load required for that ). MSD won't use this source to power the ignition system. It already got the thick red wire coming from batt source for that.
Coil won't be sourced anymore from ballast, but from MSD itself, which being multispark ( "multitriggered" ), will keep cooler than a constant source from ballast/ign switch circuit like previouslly was.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
|
|
|
|
|
|
|
