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Nick Bettevy
| | Posted on Saturday, May 15, 2004 - 11:27 pm: | 
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I have a Perfex Ignitor coil plug that I would like to know how to get it to fire. It has two knurled wire terminals on top that show continuity on an ohmmeter so I think it may still be good. Do I need any other special parts? Thanks for any help or a wiring diagram.  |
Nick Bettevy
| | Posted on Sunday, May 16, 2004 - 12:05 am: |
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Tom Stranko
| | Posted on Wednesday, May 19, 2004 - 09:36 am: |
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As I recall, these are just a small "buzz" coil
and spark plug in one package. They were usually powered by a low tension magneto like the old make & break farm engines use. I would guess that
a 6V battery (maybe not a lantern battery but a car or tractor size) would make it work. It should buzz or vibrate when power is applied and the spark should show at the tip. It should be possible to remove the cover (I had some of them years ago but did not have them long) if you have to troubleshoot it. Do you plan on putting it on an engine? |
Richard Day
| | Posted on Wednesday, May 19, 2004 - 04:49 pm: |
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My guess is the battery negative goes to the engine frame. If you are to fire the plug out of the engine then the 1/2"NPT part of the plug. The plus goes to one connection and the other connection goes to the timer where it is grounded by the internal contactor when the piston is on TDC. These plugs are rare and much sort after by collectors. Unfortunately too many are burned out or otherwise destroyed electricaly by enthusiastic but not knowledgeable individuals. |
Nick
| | Posted on Thursday, May 20, 2004 - 10:42 pm: |
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Thanks for the replys and the advice. Yes, I plan to put it on a one cyl. marine engine for show if I can get it to work. I would like a wiring diagram for it so it doesn't end up destroyed as Richard described. |
mechman
| | Posted on Friday, May 21, 2004 - 08:58 pm: |
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Goodday all. I believe that this coil has to have a separate "buzz box" I have had two of these in the past one was a hard rubber case & the other was a brass case ---they both had a vibrator in the top & the bottom seemed to be a large condenser--they had to have a separate power supply to them & I think it would have been 6 volts at that time. I will try to get a photo of them when I see the new owner of these boxes, Good luck & "All the best" Larry Healey |
Tom Stranko
| | Posted on Friday, May 21, 2004 - 10:02 pm: |
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I was looking at a set of books I have on "automobile engineering". They describe a "magnetic" spark plug with a center rod that moves up into the plug body causing a field collapse and spark at the tip. Does your plug have a center rod type electrode that seems to move? (this is a 1911-1921 copyright) |
rholcomb
| | Posted on Saturday, May 22, 2004 - 12:44 am: |
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rholcomb
| | Posted on Saturday, May 22, 2004 - 01:32 am: |
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Bosh Magnetic Plug Ignition The Bosh magnetic plug illistrated in fig. 197 is another form of magnetically operated
Make and break igniter. It is used in connection with a specially constructed Bosch low-tension alternating-current magneto. The magneto current is brought to the terminal nut 9 on the top of the plug, whence it passes through the coil winding 5. The lower end of the coil is electrically connected by the screw 26 to the body of the coil, which is insulated from the plug body 23 by a steatite cone 22 and the mica washers 18. From the coil body the current passes into the interrupter lever 20, which is normally held in contact with the fixed contact piece 21 on the plug body by the U-shaped spring 3. The interrupter lever 20 extends up-ward into the center of the coil, its upper end being indicated at 1. It is mounted on a knife edge, with the U-shaped spring 3 pressing on it just below this knife edge so as to hold its lower end 20 in contact with the fixed contact piece 21 on the plug body. Within the coil is the pole piece or cqr.e 2 which becomes magnetized whenever current passes through the coil winding. If the magnetizing action is sufficiently strong it will overcome the spring and attract the upper end of the interrupter lever, thus breaking the circuit at the contact points 20 and 21. A small brass separating piece 15 prevents the interrupter lever from com-ing into contact with and sticking to the pole piece. A weak current may. be passed through the plug without the action being sufficient to break the circuit at the igniter points. A sudden impulse of current from the magneto, however, will break the circuit and with the inductive action of the magneto armature and the coil on the igniter will produce a powerful discharge at the gap.
The magnetos for use with this igniter may take different forms. In one form a simple low-tension oscillator is used. The current wave generated by the tripping of the oscillator armature is shot through the magnetic plug and produces a spark at the igniter points in the manner just described. With a revolving armature magneto a circuit-breaker is used in the magneto circuit. In one form the armature carries a single low-tension winding. When the circuit-breaker is closed, the armature current takes this short-circuit path and only a feeble current passes through the igniter, which is connected in parallel with the circuit- breaker. When the circuit-breaker points are opened, the usual in-ductive action occurs in the armature winding and this induced current, having no other path, discharges through the magnetic plug and pro-duces the spark at the igniter points. In another form of rotating arma-ture magneto only a part of the armature winding is short-circuited at the circuit-breaker, the current generated in the main winding passing through the plug. This current is not, however, sufficiently powerful to operate the plug until the instant that the circuit-breaker opens, when the induced current thus produced reinforces the current in the main winding and causes the action of the plug as before described.
These magnetic plugs may be used on multi-cylinder engines, the current being supplied by a single magneto with a
distributor
On large cylinders two or more plugs may be used to start combustion at different points in the combustion chamber simultaneously, the plugs being connected in parallel. The plugs are easily disassembled for cleaning, when necessary, usually about once in 8 days. The magnetic plug offers a complete ignition system without any mechanical con-nections other than the drive for the magneto, as the interruption of the current is caused by the magneto current itself. Being entirely a low-tension system, it presents no insulation difficulties. The ignition timing is effected by moving the circuit-
breaker housing on the magneto. |
Lyn Mattson
Visitor
| | Posted on Monday, September 13, 2004 - 12:50 pm: |
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Hi I am new to this site. I am working on a Krimath Sea Twin engine. It has a BOSH VJU 4 BR8 distributor installed. The distributor cap has four towers with two of them cut off and a brass screw where the rotor tower should be. It seems like someone tried to adapt some parts. I would be interested in getting information on the engine and the distributor if possible. I would like to get the engine as close to original as possible. |
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Visitor
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