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#445078 - 08/28/07 09:14 PM
Re: Help me fix my 1949 Cadillac
[Re: manncad]
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JPIndusi
Member
Registered: 12/17/02
Posts: 458
Loc: Long Island, NY
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It is rare to hear of an ignition coil that runs that hot. One cause might be a leaky condenser that still allows the car to run but draws excessive current through the coil. This might also explain the miss in the engine in the higher gears you describe. See if someone can check the condenser for leakage or replace with a known good one.
Any chance this car was converted to 12 volt battery system?
Joe, BCA 33493
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#445830 - 08/31/07 04:48 PM
Re: Help me fix my 1949 Cadillac
[Re: JPIndusi]
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manncad
Member
Registered: 08/14/07
Posts: 21
Loc: Cognac France
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yes, it is rare, but last owner, who is also my best friend in CA, keeps telling me it always been like that. Yes, this car was converted to a 12 V battery system.
Also, the condenser is brand new. It used to be one on top of the coil which I don't use anymore as a mechanic told me there was already one inside the distributor, near the points. I don't know what to do anymore, I checked everything. One last chance with another mechanic next week who told me it could be the choke...
I wish I would be in the US, my car would already be running for sure.
Back in 2000, I took all the wiring out and replaced it one wire at the time. I wonder if I did something wrong with the wiring going to the coil.
Anyway, thanks again for your infos, I'll keep you posted.
Emmanuel
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#445850 - 08/31/07 05:41 PM
Re: Help me fix my 1949 Cadillac
[Re: manncad]
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49packard
Member
Registered: 02/22/04
Posts: 220
Loc: Nashville
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Stupid question-you do have a 12v coil in it-if it has been converted to 12v?
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#445888 - 08/31/07 08:47 PM
Re: Help me fix my 1949 Cadillac
[Re: manncad]
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Dave@Moon
Long Time Member
Registered: 12/14/99
Posts: 7374
Loc: Fairfield (Cincinnati), OH
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Also, the condenser is brand new. It used to be one on top of the coil which I don't use anymore as a mechanic told me there was already one inside the distributor, near the points.
The condenser mounted on the coil was almsot certainly there for AM radio interference suppression. Ignition condensers are almost always mounted inside the distributor, as you state.
If you disconnected/removed the radio suppression condenser it shouldn't have effected anything except AM radio reception, unless some of the other wiring was mounted to the original suppression condenser points instead of the correct location.
Maybe if you can post a photo of the coil someone could spot a problem?
_________________________
"I stand by all the misstatements that I've made."
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#446020 - 09/01/07 02:57 PM
Re: Help me fix my 1949 Cadillac
[Re: RocketDude]
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49packard
Member
Registered: 02/22/04
Posts: 220
Loc: Nashville
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I would expect the car still has the 6v coil with 12v on it. A coil is a transformer-which consists of coils of wire wrapped around a steel core.
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#446087 - 09/02/07 12:01 AM
Re: Help me fix my 1949 Cadillac
[Re: RocketDude]
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JPIndusi
Member
Registered: 12/17/02
Posts: 458
Loc: Long Island, NY
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RocketDude:
Exactly why I asked if this car was converted to 12 volts! If he doesn't have a ballast resistor he is cooking the coil and burning the points.
I hope we find out what is going on here.
Joe, BCA 33493
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#446180 - 09/02/07 04:39 PM
Re: Help me fix my 1949 Cadillac
[Re: JPIndusi]
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manncad
Member
Registered: 08/14/07
Posts: 21
Loc: Cognac France
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well, the coil is a 12 v and the wire comes straight on it. There is no ballast resistor. The only ballast resistor that I use is for the cigar lighter and the gas gauge ( the gauge stoppped working anyway, but that's not an issue ). So I have to try wiring the coil via the ballast resistor and see if it stops getting hot.
Thanks everyone
I'm supposed to take the car to a professional mechanic tuesday. I'll keep you updated.
Emmanuel
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#446227 - 09/02/07 09:12 PM
Re: Help me fix my 1949 Cadillac
[Re: RocketDude]
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49packard
Member
Registered: 02/22/04
Posts: 220
Loc: Nashville
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As I think I understand the situation. You have a coil that is designed for 6v operation being used on 12v. That increases the voltage to the plugs about 2x. Which will kill the plugs. Which is probably the reason for black smoke??
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#446484 - 09/04/07 06:48 AM
Re: Help me fix my 1949 Cadillac
[Re: 49packard]
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manncad
Member
Registered: 08/14/07
Posts: 21
Loc: Cognac France
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The coil is designed for 12 v operation being used on 12 v battery. The mechanic said this morning he didn't have this ballast resistor and that there was no point to have it anyway. The car stayed in the shop and he'll have a look at it. God I wish I had one of you guys right here right now to fix this all thing. But I'm not desesparate and I'll find the problem.
I'll update soon
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#446504 - 09/04/07 09:44 AM
Re: Help me fix my 1949 Cadillac
[Re: manncad]
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RocketDude
Member
Registered: 12/08/05
Posts: 426
Loc: So California
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If you have a 12V system and do not have a ballast resistor to cut the voltage down to 8.4 volts, you will ruin the ignition system. Perhaps French cars don't operate that way, but American cars most definately do. Your mechanic is completely wrong if he tells you a resistor isn't neccessary.
Here is a quote from a motor manual "the idea of the resistor is that you deliberately design
> the coil to operate at a voltage lower than 12 V and then use
> the resistor to get to that voltage under normal conditions.
> When you're cranking the engine with the starter the battery
> voltage drops and hence the sparks get weaker. To combat this
> you bypass the resistor as long as the starter is operating.
> This gives you pretty much similar sparks during cranking and
> normal operation.
Here is a page I googled..
http://aolsearch.aol.com/aol/search?encq...llover&ie=UTF-8
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#446511 - 09/04/07 10:05 AM
Re: Help me fix my 1949 Cadillac
[Re: RocketDude]
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RocketDude
Member
Registered: 12/08/05
Posts: 426
Loc: So California
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To further explain how that system works, the solenoid mounted on the starter will have two small terminals. One of them received voltage from the ignition switch which activates the starter when the key is in crank position. The second terminal is called the "hot Shot" terminal. Under cranking conditions only, that terminal will be hot with 12V's. A wire runs from that terminal to the coil, so you have 12V's during cranking, to give your coil the extra voltage for cranking. When the engine fires and you release the key, that wire is now at 0 volts, and your ignition system is now running on the 8 V's supplied by the ballast resisted wire. The hot shot wire bypasses the ballast resistor during cranking only, to give you a little extra POP for starting..!
I'm betting if you look at your solenoid, you will only see the one wire. The hot shot isn't hooked up because you are running on 12V's all the time. Put the resistor in the system, hook up the hot shot wire and then you can spend more time with the berries.....
keep the faith, this issue will be resolved
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#448382 - 09/12/07 01:59 PM
Re: Help me fix my 1949 Cadillac
[Re: RocketDude]
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manncad
Member
Registered: 08/14/07
Posts: 21
Loc: Cognac France
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The car went to a first shop then a second one where I thought the machanic would be better. He adjusted the points, the advance and the 2 screws in front of the carburator. He told me the car was then running great, but without the air filter, which is plugged. So I went to pick up the car and realised it was not running well at all, even worse than before. Still black smoke, still missing and most of all, the coil burning hot. So I left without paying anything so far, a little pissed off. Anyway, I need to find a new and clean airfilter and a resistor ballast. So I have one question, can someone tell me what kind of resistor ballast I need for that car and where ? I will order it right away. I went online to look for it and there are a lot of different resistor.
Thanks
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