Gallery, Projects and General > How to's

Another way to make spark plugs

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sorveltaja:
I hope this isn't too  :offtopic:, but I'd like to ask an advice.

I have made several spark plugs for my test engine, using ptfe as an insulator. Problem is, that the insulator wears out really fast, and finally causes sparking to appear in a wrong place.

Also the insulator, while it erodes away, gathers black dirt, that makes sort of bridge, that leads the plug to shortcut.

Ignition system, that is in use:

An old computer psu 12V 2.5A as a power supply.
Automotive 12V ignition coil.

Could that 2.5A be too little?

Fuel that I use is gasoline without an oil addition.

chuck foster:
george i thank you for showing a much better way of making plug's and the end result look's way better than mine.  :thumbup: :thumbup:
the next time i need a plug i will be making it your way.

chuck  :wave:

Dean W:
I saw this one on the other forum, George, but I liked it just as much the second time around.
And thank you.  Again!

BTW
I have a little Atlas lathe, just like yours.  There's something wrong with it, though.  Mine won't
make the same kind of things that yours will..

; )

Dean

NickG:
George,

When I was buying some metal over the weekend the guy there mentioned freezing ptfe before machining it and it behaves more like metal. Have you ever heard of this or tried it? By the looks of your thread you don't need to as long as you take light cuts etc.

Nick

gbritnell:
Gentlemen, sorry I haven't gotten back to you sooner. Here's a couple of answers to your questions.
Sorveltaja, I have used an automotive type ignition setup on my four cylinder OHV engine quite extensively. It consists of a 12 volt battery with an automotive 12 volt coil and a dropping resistor. I find that it erodes the Teflon away a little but the plugs last through many hours of running before they need replacing.

Nick, I haven't heard of freezing the Teflon, at least not with the modelers that I talk with. I use a larger diameter piece of stock to keep things as rigid as possible when machining.
George

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