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Guest
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 Posted:
Mon Nov 21, 2005 5:35 pm Post subject:
automotive ignition condenser uf and voltage rating? |
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Anyone know an approximate rating for an ignition condenser like
voltage and uf? Can these things be used in HV electronics as a
regular capacitor?
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Tim Williams
Guest
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| Posted:
Mon Nov 21, 2005 5:35 pm Post subject:
Re: automotive ignition condenser uf and voltage rating? |
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0.33uF 200V? Ballpark.
Replace with a snubber rated film capacitor, encapsulated further if
necessary (considering most points caps are metal cased!).
If you're asking if you can use some in a different circuit, sure, but hell
I don't know why you'd be asking the value, it's usually stamped on the
things you know.
Tim
--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms |
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kell
Guest
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| Posted:
Thu Nov 24, 2005 1:35 am Post subject:
Re: automotive ignition condenser uf and voltage rating? |
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| Quote: | Anyone know an approximate rating for an ignition condenser like
voltage and uf? Can these things be used in HV electronics as a
regular capacitor?
|
The "condenser" I tested read 0.2 uF.
As for voltage rating, I'd guess several hundred volts. Traditional
coils
from old style, dwell based inductive ignitions have a turns ratio of
about 100 to 1. If such a coil puts out about 20kV, that means the
condenser would have to withstand 200 volts, but of course it must have
a significant safety margin -- maybe a factor of two? And then there
is
"coil fault;" if a spark pug wire falls off and there is no place for
the coil's
energy to go, the flyback voltage is even greater. I would think a
condenser
would have a 400 volt rating, ballpark, but that is just semi-informed
speculation
on my part.
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Guest
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| Posted:
Fri Nov 25, 2005 12:34 am Post subject:
Re: automotive ignition condenser uf and voltage rating? |
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| Thanks, that helped. |
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neon
Joined: 25 Feb 2006
Posts: 580
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Tue Mar 14, 2006 9:58 am Post subject:
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| to fire a spark plug it req, about 100 mw/spark at 40kv now you can figur e out i hope. the ratip of the [coil] actualy a tranformer is 12:40kv the capacitor is there to dampen the negative kickback from the transformer yes the spark goes pos then neg. and the cap must absorb the voltage and the power. |
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