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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

"Bozz" coil question


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  #1  
Old 03-05-2011, 07:31:44 PM
Zira Zira is offline
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Default "Bozz" coil question

I built a "Bozz" coil (buzz coil using an automotive Bosch relay) some time back & it worked very well. Since I have 3 more engines that need buzz coils & won't be going to any shows where I can buy the usual Ford ones, I decided to make a couple more. I am having trouble scrounging good round ignition coils, so I thought I would try a modern coil. It was square, with a single lead out. It didn't work, it would only spark when I turned it on & off. Any ideas on why that is?
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Old 03-05-2011, 08:05:22 PM
eddie bedwell eddie bedwell is offline
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Default Re: "Bozz" coil question

Hi Zira,
my "Bozz" coil (old cylinder type coil) worked only once also, tried everything until I realised it also needed a condensor on the coil of the relay. Man does that thing throw a mean shower of sparks.
Hope this helps.
Cheers,
Eddie B.
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Old 03-05-2011, 08:15:46 PM
Zira Zira is offline
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Default Re: "Bozz" coil question

Thanks. I had a condenser. Actually, I just put it in place of the coil in the first one I built (which I know worked) just to test it.
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Old 03-05-2011, 08:21:43 PM
Jerry Sweet Jerry Sweet is offline
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Default Re: "Bozz" coil question

You need a set of breaker points that are normaly closed to complete the circuit.When the circuit is complete the coil core should be setup to open the points and break the circuit,letting the points close again in rapid succession.Each time the points break the flux creates a spark current from the secondary winding.You will need a condensor across the points.
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Old 03-05-2011, 09:42:46 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: "Bozz" coil question

Be sure your relay has 30 and 87-87a and you're using the 30 and 87a terminals. Some relays aren't normaly closed and won't work. 85 and 86 should go to the terminals of the coil, bat + to one terminal of the coil, the other terminal of the coil should go to 30 on the relay, 87a to the ignition points or contacts, a condensor connected across 30 and 87a. 30 and 87a can be swapped with no problem. The ign coils are available from auto parts in the cheaper lines , IC 12 is the Standard #.
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Old 03-05-2011, 11:13:43 PM
Zira Zira is offline
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Default Re: "Bozz" coil question

Just to clarify, I have a working "Bozz Coil" set up. I removed the round old-style coil & replaced it with the new style coil. The condenser, relay, & all the rest were the same. With the new coil, it would only spark when the current was turned on or off. With the old style coil, it buzzed fine. Any other thoughts?

I really don't want to buy new coils, they cost as much as a working Ford buzz coil ($20+).
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Old 03-06-2011, 11:47:37 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: "Bozz" coil question

I get the second line coils for about $10. Sounds like the resistance is too low on your coil, compare to the working one. Some ofthese are set up for capacitive discharge and the resistance is realy low.
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  #8  
Old 03-06-2011, 03:49:22 PM
Zira Zira is offline
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Default Re: "Bozz" coil question

Where do you get those for $10? The local car places quoted me $20 - $25. I can usually scrounge them for free at the scrap yard but as often happens, there are lost of them there until you need one.
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