Help! > Specific Engine Help
Piston spark ignition points?
Niels Abildgaard:
I am using the last part of life for walking my dog and save humanity.
One idea is to make 4/6 kW combined power and heat from gas put in an opposed ,crosshead Junkers scheme when other sources are down or to expensive
and
the other is a powered paraglider poweplant of ca 20kW.
Both will benefit enormeously if ignition points can sit in center of pistons.
Has this been solved before and where?
Admiral_dk:
Hej Niels
I have honestly only seen this with a single piston - where one Point was part of the Piston (ground Electrode) and placed as a tip in the middle.
Haven't got a clue right now on how to for instance isolate a complete ; Crank, Rod (easy) and piston from the rest Electrically - and basically will have to rule that option out.
Having just the Centre Electrode poking out into the Middle from the Cylinder Wall - might be feasible - but not with Phased Cranks (unless you can live with a very low compression ration) ....
So how about CI (Compression Ignition) - like Model 'Diesels' ...???
They are very efficient and simple - except when you want 'Variable Compression' with a dual Crank ....
Per :cheers:
gipetto:
gasoline direct injection i believe it's called in modern vehicles. it's used in hyundai's hilariously unreliable theta 2 engines. it does work but the gasoline vapour tends to strip the lubricating oil from the cylinder and the vapour enters the sump leading to accelerated engine wear.
Hears a weird idea though. suppose you put a magneto and spark plug inside a piston, then a magnet inside the cylinder liner to trigger it. it would have to withstand the heat of combustion.
there was also a thermonuclear internal combustion design that used lasers through a glass aperture to ignite a fuel pellet through fusion.
Niels Abildgaard:
--- Quote from: Admiral_dk on January 07, 2025, 09:25:45 PM ---
I have honestly only seen this with a single piston - where one Point was part of the Piston (ground Electrode) and placed as a tip in the middle.
--- End quote ---
Hello Per
Was it SAAB and when?
Niels Abildgaard:
--- Quote from: gipetto on January 07, 2025, 09:43:54 PM ---
Hears a weird idea though. suppose you put a magneto and spark plug inside a piston, then a magnet inside the cylinder liner to trigger it. it would have to withstand the heat of combustion.
there was also a thermonuclear internal combustion design that used lasers through a glass aperture to ignite a fuel pellet through fusion.
--- End quote ---
Not so weird idea.
Some 35mm AA gun shells have exact velocity measured and wanted fuse setting done when leaving barrel.
Laser ignition is difficult due to dirtying of window ater more than a few ignitions
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