Gallery, Projects and General > How to's
Another way to make spark plugs
Artie:
--- Quote from: NickG on January 04, 2010, 07:07:19 AM ---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
--- End quote ---
Hi Nick, this is a valid procedure BUT, you have to work fast as it doesnt stay frozen for long, but yes it does work in making the teflon much more rigid.
Cheers
Rob
tel:
Well no Artie, it wouldn't stay froze for very long at your place (or mine) this time of year. I got some 5/16" stuff here that is quite limp - like cooked spaghetti.
sorveltaja:
How about freezing spray, that is used to find loose solderings on circuit boards? Should be more instant, I guess.
Brass_Machine:
Neat write up. Pretty amazing results... to think making ones own sparkplug. :thumbup:
Eric
madjackghengis:
--- Quote from: sorveltaja on January 01, 2010, 02:18:36 PM ---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.
--- End quote ---
Sorveltaja, Just for your information, a conventional car engine with points uses a primary current of approximately 2 amps at 12 volts as pretty much the industry standard of points and thirty years ago. You are probably running rich, and you may be burning the edge of the PTFE which would leave a sticky carbon "smut" on the face of the plastic. If you are running well, and smoothly, and you are a bit lean, the extra heat of a lean burn could be burning the face of the plastic. For what it's worth, mad jack
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version