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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

Model T Buzz Coil Question


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  #1  
Old 05-02-2014, 06:34:16 PM
matterest matterest is offline
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Default Model T Buzz Coil Question

is there a way to make a buzz coil spark when the points are open?
i am trying to use it on a model engine with a distributor.
thanks,
matt
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  #2  
Old 05-02-2014, 07:33:10 PM
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Elden DuRand Elden DuRand is offline
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Default Re: model T buzz coil question

Matt:

I -think- you're asking if you can use a Model T coil like it was a regular points ignition coil.

The answer is yes, although you wouldn't get a 'continuous' spark. You'd need a condenser across the engine points and every time the points opened, you'd get a spark like with a regular auto coil. To make it work this way, you have to adjust the buzzer "trembler" so those contacts are always closed.

Again, if I understand your question correctly, you'd be better off with a regular points-type auto coil.

If you're asking if a normally operating 'continuous spark' Model T coil can be used with a distributor, the answer is no because the continuous spark would jump from one post to the next as it fired and the rotor turned. That would kinda scramble the timing, I think.
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Old 05-02-2014, 08:32:12 PM
matterest matterest is offline
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Default Re: model T buzz coil question

ok thanks, i was just thinking the continuous spark would make it easier to start. i think i might be able to wire a transistor to make it work though.
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Old 05-25-2014, 01:20:29 AM
edisondiamond edisondiamond is offline
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Default Re: model T buzz coil question

Yes, simply close the points down. The T coil will then act like a modern coil complete with built in condenser. Several aftermarket distributors could use T coil in just that way back in the era of the T's. But unless the condenser has been replaced it needs to be, they get old and leak.
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Old 05-25-2014, 08:31:07 AM
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Default Re: model T buzz coil question

Since the internal Ford coil condenser is wired across the trembler contacts, if you tighten the trembler points until they are always closed, you will have to use an external condenser or the engine's points will burn quickly and you will have a weak spark.

If you use a transistor to "reverse" the engine points, you will need to wire an ignition condenser across the transistor even if you keep the "buzzcoil" function working. The condenser will protect the transistor from the high voltage inductive kickback when the transistor turns off.

A diode wired across the transistor emitter/collector (cathode to collector on NPN transistor) will also protect it from stray transients that go below emitter potential and can damage the transistor.
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Old 05-26-2014, 01:17:02 PM
edisondiamond edisondiamond is offline
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Default Re: Model T Buzz Coil Question

In the car (T) as used in the original system, the coil works on AC but will work on DC supplied from a battery. The coil does not care when using DC which terminal is + or - in regarded to the power source that goes to the power or grounding terminal, in this case the points. If you wish to keep the points on the coil acting as normal, heat would be a big concern as it could both melt the tar out and burn the points if left vibrating too long. I think the condenser is wired in the circuit and would act as a normal condenser in the point and coil system and as long as it's not bad, should function the same way. When using a T coil in a regular points system the would be a resister in the power supple line like used with some auto applications using a standard coil.
Not sure why you would need transistors and diodes in this setup.

---------- Post added at 09:50 AM ---------- Previous post was at 09:42 AM ----------

To add; The Model T was made to operate up to 35+ volts AC, works fine on 6 volts DC, will also work on 8 or 12 volts DC. In a T, 12 volts will give a faster ramp time and allow for higher top speed but would be fine for the top speeds of 30-35 MPH. A 6 volt dry cell would work. Some early drag saws use a set of points, dry cell and model T coil to run.

---------- Post added at 10:17 AM ---------- Previous post was at 09:50 AM ----------

Bottom line, hook the power to the bottom (+ or -) terminal, the line to your points to the upper side terminal and spark plug to the bottom side terminal. With the points set on the coil set to about .032, as long as the points in your distributor are close there will be fire at the spark plug.
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Old 06-03-2014, 01:16:34 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Model T Buzz Coil Question

NOTE: on Edisondiamond's last post he stated "as long as the distributer points are closed... . This means you will have to time your engine distributer so that ignition is to occur at the exact point where the points CLOSE - not open as in regular engine operation. ALSO, as spark is occurring as points close, this will also affect where the rotor is pointed when spark occurs. You may find the rotor slightly to one side of the desired transfer point on the cap. This may lead to cross fire or spark delivery to the wrong cylinder at time of spark.

If you are looking for a multispark system for 'easier' starting, I believe MSD has a coil that delivers multiple sparks per points opening.
Andrew
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Old 06-03-2014, 02:16:31 PM
John T Hall John T Hall is offline
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