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Ford 9N, 2N & 8N Discussion Forum
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what exactly does the condenser do?

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george S

06-01-2005 08:14:12




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Was B.Hogging over the weekend, suddenly my engine started missing real bad, ran like a 3-legged... make that a 2-legged dog, had to hold the choke 1/2 out just to limp back to the barn. Reviewed Dell's somewhat famous hit list for ignition problems, quickly found my spark was nearly non-existent. Checked voltage to coil - OK, not the switch.
Pulled the dist. cap and watched the points in action while cranking the engine. A sharp blue spark was jumping across the points when the points opened. Luckily, I new points& condenser, and new ignition wires on my workbench awaiting install. I also noticed my point gap was ~.002 too close on the old points. Installed new parts and regapped points. I noticed the spark across the points was all but gone. Engine fired right up and runs like a champ... again. Back in action in < an hour!

Got me thinking... what exactly does the condenser contribute to the ignition... help control arcing across the points? Or something else?
sorry for the long post... thanks

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souNdguy

06-01-2005 10:52:48




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 Re: what exactly does the condenser do? in reply to george S, 06-01-2005 08:14:12  
They debounce the points.

Soundguy



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Hobo,NC

06-01-2005 10:19:11




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 Re: what exactly does the condenser do? in reply to george S, 06-01-2005 08:14:12  
A condenser or capacitor is used to promote a faster collapse of the magnetic field. Neither component will allow direct current to pass through it to ground; however, alternating current is able to pass through. A direct current that pulses very fast becomes alternating current and can pass through the condenser or capacitor. This allows the current in the primary coil circuit to pass through either of these components to ground.

The condenser is connected to the primary winding . Once the current stops, the magnetic field falls back into the primary winding to stabilize the current within the winding. The faster the current in the primary winding dissipates through the condenser, the faster the magnetic field will collapse. The rapid movement of the magnetic field increases the induction within the secondary winding and the current, being pushed by a high voltage of up to 50kV, will look for a pathway or circuit.
I think Dell has the best answer at least its simple enoufh fer me to understand

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Dell (WA)

06-01-2005 09:17:05




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 Re: what exactly does the condenser do? in reply to george S, 06-01-2005 08:14:12  
George..... ...condensers "absorb" the inductive coil magnetic field induced flow of electrons when the points OPEN. This is a normal natural coil phenomon and is actually what causes "sparkies" that make yer sparkles spark.

Without a condenser, that 0.015" points gap will burn-out. When you really OPEN a switch (and points are a special switch) there is little/NO spark strong enuff to jump a WIDE-GAPP, but that itty-bitty 0.015 points gap ain't wide enuff, so the electrons will JUMP the gap unless they are absorbed by the condenser.

NOTE: condensers are 2-metal foil conductors seperated by an insulative film. When the points close, the points actually short-out the 2-foils and DISCHARGE the condenser so there is a place ready the next time to absorb the extra electrons when the points OPEN. I went to college 4-yrs to learn that simplistic explanation..... ...Dell

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rbell

06-02-2005 05:30:41




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 Re: what exactly does the condenser do? in reply to Dell (WA), 06-01-2005 09:17:05  
I always use:
A condensor is a road block for dc current and a highway for AC current :-)



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onefarmer

06-01-2005 12:47:56




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 Re: what exactly does the condenser do? in reply to Dell (WA), 06-01-2005 09:17:05  
Right on Dell. That is what I learned also. I learned in addition as a side benefit that the discharge of the condenser when the points close aids in rebuilding the magnetic field in the coil.



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OH Boy

06-01-2005 08:35:14




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 Re: what exactly does the condenser do? in reply to george S, 06-01-2005 08:14:12  
Yes it prevents/minimizes the sparking at the points. How it does that is a mystery to me, I am electrically challenged as Dell puts it.



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Rob

06-01-2005 08:41:51




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 Re: what exactly does the condenser do? in reply to OH Boy, 06-01-2005 08:35:14  
Ask Eric (WI).

The condenser prevents points from burning out in a very short time.



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