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12-08-2013, 12:29 PM | #21 |
Senior Member
Join Date: Jul 2013
Location: Hayward Ca
Posts: 635
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Re: 12volt conversion question ballast resistor
MikeK
Sounds like you are sharp on electrical things. I have a question for you. I have a 33 roadster---qriginal style eng---12 v neg ground--- original generator . I set the 3 brush so as to 5-8 amp charge all the time. I have been using this set up for over 30 years---same generator---yes the car has in the past been driven(my son Allan Cassaro & myself drove the rds from Hayward Ca to 1983 early ford grand national meet Dearborn Mich ) back to my question ----- am I correct that the gen is controlled by the battery ( 6v battery charges 6v= 12v battery charges 12v ) also because of different field coils 6v--12v when using 12v battery with 6v generator the charge rate at low eng RPM low or no charge. This is what I have been telling people for years. Your thoughts Nick |
12-08-2013, 01:34 PM | #22 |
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Join Date: May 2010
Location: Crown Point, NY and Punta Gorda, FL.
Posts: 259
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Re: 12volt conversion question ballast resistor
Go to NAPA, use
Coil (12 volt) IC14 Echlin (w/built in resistor) or have any other Auto Parts Dealers cross reference to the NAPA Number. I have been running 12 Volt Neg. Ground with the IC14 for 5 years, No Problems. |
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12-08-2013, 02:23 PM | #23 |
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Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: 12volt conversion question ballast resistor
For electronic type performance with points ignition in the model A, I use the pertronix Flame thrower 40.000 volt coil. I use the 3.0 ohm epoxy filled version with 12 volt. I get instant starts, clean running spark plugs and a noticeable increase in power. The coil doesn't look that much different than other replacement coils. Here is a pic of my coil.
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12-08-2013, 02:53 PM | #24 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: 12volt conversion question ballast resistor
I've been thinking about getting a 1.5 ohm Pertronix #40111 [ thanks to Purdy] this winter and trying it just for the heck of it to see if there any difference.
Back on subject. The key is voltage at the points. There is no such thing as 6 or 12 volt points/condenser. The key is having no more than 8 volts at them regardless of system voltage. Thats why there are 3.0 and 1.5 ohm coils and ballast resisters [or resistance wire]. |
04-02-2014, 02:16 PM | #25 | |
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Join Date: May 2012
Location: Las Vegas
Posts: 138
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Re: 12volt conversion question ballast resistor
Before I post a question, I search. So far, everything I've wanted to know has been covered before, usually several times!
I was looking for a coil and saw this interesting post and I had to comment. I've never heard of tapping into the battery case to get 6 volts, pretty ingenious! You really do learn something new everyday, thanks Purdy Swoft! Quote:
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kris |
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04-02-2014, 04:17 PM | #26 |
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Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: 12volt conversion question ballast resistor
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