New 5 cycle IDI diesel

[itzdshtz]

Check this out,rebirth of the IDI?

http://www.diro-konstruktion.de/dieselmotor.html

[745 turbogreasel]

Wow, that German crack makes my head spin...

[carrizog60]

can someone explain in guide lines?

[clbanman]

Link to the U.S. patent for the engine:
http://patft.uspto.gov/...

[jtanguay]

i don't really understand the benefit of that extra rotating assembly... it seems that the injector pre-injects into the small shaft which then is opened into the main combustion chamber... is this supposed to pre-ignite the fuel or something?

it almost seems like the glow plug is pre-igniting the fuel in the small rotating chamber... lots of wear and tear on that gp??? i guess once it gets hot enough it shouldn't need the gp... but still looks to me like just another part to break... and if your injection timing is off... watchout  :shock:  :lol:

very interesting though... maybe makes for easier cold starting too???

[malone]

Pretty cool.. one of the PDF file shows a step-by-step diagram of each cycle. It makes sense how it functions.. but like the poster above stated, what are the benefits of this design?? Not enough English in the original link. I'll check the U.S. patent file though, and maybe post a Cliff's Notes here (or someone else can).

[Slave2School]

What are they trying to accomplish?  A super high reving diesel design with more complete combustion from more fuel/air burn time?  It looks pretty wacky to me...I wish I could read german.

[Darkness_is_spreading]

They are using the rotating combustion chamber in which a portion of the rich mixture is to be burnt, which is then intended to be used as an igniter of a leaner mixture in the larger combustion chamber.  

So they in a way are improving the firing efficiency of the motor by burning fuel in a Pre(rotating chamber), then  allowing the preburnt to enter the chamber or lean fuel mix and to help burn that mix.

I would think the possible benefits would be lower CR,  ie less compression of air to ignite the fuel,  run more boost,  lower EGT's,

Reving might be a problem not totally sure,  because not sure if these little rotating combustion chambers would hold up to the heat and crazy rpm........

[jtanguay]

very interesting concept on a completely enclosed pre-combustion chamber...  but like i said before... improper injection timing can now break your motor  :shock: (if you have this type of motor of course...)

i can see the benefit of better cold starts on this type of setup.  but what would the precombustion chamber be made out of?  what could withstand that much heat/abuse???  from the pics it almost looked as if the diesel fuel was cooling down the alternating combustion chamber...

[MacGyver]

First thing I thought of was a hundred year old slide-valve engine.

[Dr. Diesel]

I think the point of this is to lengthen the uh--dwell period-- in which the air (and fuel) remain in the state of highest compression. Twice as long, by the looks of it. Allowing combustion to occur in a small volume chamber for such a long time (Like our IDI's, but without driving a piston away and immediately reducing the chamber volume) must allow for a higher percentage of burned fuel. That can only mean more power, efficiency, and lower emissions.
The animated diagram shows what appears to be some degree of combustion when the fuel is injected. Perhaps the glowplug is used only for starting, which might be the phase the animation is showing.

This could be the combination of the best of both DI and IDI engines in one. The efficiency of DI with the revability and lower noise/vibration of IDI.

I like it!

Tack on that new VW plan of turbo and supercharging, and you've got a winner.

[OM617]

It just looks like another big moving part to wear out and cause problems.