Help! > Specific Engine Help
Piston spark ignition points?
gipetto:
niels is trying to improve the efficiency of the opposed piston engine. there's nothing wrong with that, if he doesn't get trapped in a money pit.
As regards the electric isolation spark problem, I guess you could isolate one side of the engine from the other, by using viton rubber rings on the pistons, and an insulator on one end of the cylinder liner.
Another approach is to not do any isolation, and instead ensure every part has an electrical connection. Then instead of using dc or ac to make the spark use radio frequency. I have enclosed a picture of an antenna i once built. you can see that below the coaxial feedpoint there is a bridge between both sides of the antenna. That is one of the mysteries of rf, because what appears as a short at dc is an insulator at rf, so you may be able to add some tuning stubs to the engine to create the necessary electrical isolation.
Niels Abildgaard:
--- Quote from: gipetto on January 08, 2025, 10:42:00 PM ---niels is trying to improve the efficiency of the opposed piston engine. there's nothing wrong with that, if he doesn't get trapped in a money pit.
As regards the electric isolation spark problem, I guess you could isolate one side of the engine from the other, by using viton rubber rings on the pistons, and an insulator on one end of the cylinder liner.
Another approach is to not do any isolation, and instead ensure every part has an electrical connection. Then instead of using dc or ac to make the spark use radio frequency. I have enclosed a picture of an antenna i once built. you can see that below the coaxial feedpoint there is a bridge between both sides of the antenna. That is one of the mysteries of rf, because what appears as a short at dc is an insulator at rf, so you may be able to add some tuning stubs to the engine to create the necessary electrical isolation.
--- End quote ---
Thank You for interest and proposals.
I have seen pictures of ball bearings destroyed by sparking and my micro CHP shall run hours without attention.
I hope that a high tension chain over two moving isolated 0.05mm airgaps between piston and cylinder wall in low pressure zone and a high tension spark gap in piston center could work .
Same technology as in old fashioned distributors on V-8 and the like.
Worth trying and if not working no disaster
Niels Abildgaard:
It is many years since I have seen the inside of a spark distributer between coil and 4 sparkplugs.
What was the gap materials and how wide was the rotating gap?
Next problem is where to put the two sliding gap per piston in my world saving crosshead opposed piston configuration?
In crosshead/crank sections or between the the glands in the cylinder division?
In crosshead chambers we can have a non ignitable lubricant.
In the cylinder division there will be lots of ignitables and fuel.
One can argue that the width of the sliding low pressure spark gaps can be kept down to 0.05mm so the sparks can easily jump but not ignite anything or it does not keep burning like in a miners safety lamp.
A single cylinder opposed piston engine (Junkerator) can make the most efficient EV-range extender if we can integrate swishning and ignition in the two opposing pistons.
If someone wants richness and fame start Googling
Drallmeier and opposed piston
Interesting reading
gipetto:
I find some of your concepts difficult to understand, i believe it to be a language issue and illustrations would clarify your comments. i am having trouble with your high tension chain spark.
Here's another idea, suppose that you moved the cylinder with a crank and con rod, so the spark plug location was kept between both pistons. you could mill a relief in each piston, and have the plug protrude half ways into the cylinder.
Another idea is to make a piston with a partial spark plug inside it. the electrode would be at the center of the piston, and have an ceramic tube and metal rod that moves radially outward to where it brushes against a contact in the cylinder liner.
The cylinder liner also has a ceramic tube and metal contact, so that when both contacts touch and the timing is correct the spark is fired.
The advantage of this approach is that you could change the spark plug without tearing down the engine, since all that you would need to do is ensure that the cylinder plug is over the piston plug before unscrewing them. This is similar to how the wrist pins are removed on some subaru boxer engines.
Niels Abildgaard:
--- Quote from: gipetto on January 10, 2025, 11:28:34 PM ---I find some of your concepts difficult to understand, i believe it to be a language issue and illustrations would clarify your comments. i am having trouble with your high tension chain spark.
Here's another idea, suppose that you moved the cylinder with a crank and con rod, so the spark plug location was kept between both pistons. you could mill a relief in each piston, and have the plug protrude half ways into the cylinder.
Another idea is to make a piston with a partial spark plug inside it. the electrode would be at the center of the piston, and have an ceramic tube and metal rod that moves radially outward to where it brushes against a contact in the cylinder liner.
The cylinder liner also has a ceramic tube and metal contact, so that when both contacts touch and the timing is correct the spark is fired.
The advantage of this approach is that you could change the spark plug without tearing down the engine, since all that you would need to do is ensure that the cylinder plug is over the piston plug before unscrewing them. This is similar to how the wrist pins are removed on some subaru boxer engines.
--- End quote ---
Thank You for thinking.
Great minds thinks alike
Your idea is almost the same i had when talking of a spark chain
A 0.05mm mowing airgap between cylinder wall and piston in low pressure
A normal spark plug gap 0.5mm on center of top of piston in high pressure
A 0.05 mowing airgap opposite the first on other side of cylinder.
Will be back after some dog walking in wood and put up a sketch.
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