Brought to you in part by:
Topic: resistance wire (kinda long)
From: Vancouver, Canada
Registered: Sep 2000
posted 02-08-2001 03:05 PM
I sent the following e-mail to MSD tech yesterday and just received their reply:any comments???
recently installed a Blaster 2 coil in my 71 Mustang which has a 351C-2V...followed instructions and spliced in the supplied ballast resister into the 12V red wire running to the coil...recently added a
Pertronix ignitor to the distributor (Accel 34202V-dual point-vacuum advance)...am wondering if I still should have the ballast resister in the 12V supply...I am under the impression that Fords typically have a resister wire in there somewhere although my wiring diagram is a little vague on
this...it shows a resistor wire in the wiring diagram but doesn't appear to be directly in the 12V supply to the coil....will having an extra
ballaster harm anything?? will it affect the intensity of spark delivered by the coil...should I leave it in or take it out???
Pertronix normally recommend to have a 1.5 ohm resistor to their Ignitor,the MSD Blaster Coil has already .7 ohms built in to it. You will have to measure the resistor wire, if it is a .8 ohms resistance you do not need the
resistor, but if it is no resistance you will need to put the .8 ohm resistor in line. It will damage the ignitor if too much resistance is placed in line, and will not get the full output.
71 Red Rag
Registered: Mar 2000
posted 02-09-2001 04:11 PM
I'll try to help out with this one.
The purpose of a resister wire, or balast resister in the coil wire is to reduce the voltage to the coil while the engine is running to apprx. 6 volts. This wire or resister is bypassed while you are cranking the engine to deliver double voltage to the coil for starting. Adding extra resistance will lower the volatge to the coil, and lower the spark voltage. The only thing I would question about MSD tech's advice is why would too much resistance damage the igniter? Seems like it would just weaken the spark. I would replace your ignition wire with a new 16 ga copper wire and use the balast resister. Good luck,
From: Glenmoore, PA, USA
Registered: Jan 2000
posted 02-11-2001 03:47 PM
Craigber.....Been there done that....put a pertronix in my oem distributor...no apparent problem...added an "entry level" MSD Blaster ignition....
Result...popping, backfiring and NO GET UP AND GO....
Several confusing e mail tech q and a's to MSD and Pertronix lead no where...
Bypassed the Resistor wire from the ignition switch and ran a straight 12 volt wire to the battery.....
END OF PROBLEM.....GET RID OF THAT RESISTOR WIRE...
Resto Mod '70 Sport Roof
Arrest Me Red
Contact Us | Mustangsandmore Front Page
Copyright 2002, Steve LaRiviere
Ultimate Bulletin Board 5.47d