Jet-fueled 2-stroke diesel V-4

[Logic]

Originally Posted by freebeard

Could you provide an example or illustration?

I saw it mentioned on the linked Wiki page and remember the concept being something like the piston bit shown here:


Now that's a 4 stroke on both sides = a '2-stroke'.
Where a 2 stroke on both sides would be a '1-stroke'.

I think piston heat, lubrication (of both sets of rings), engine 'height' and the bottom piston sealing are the challenges in this design.

When you think of a 4-stroke per chamber its a bit of a mess:
power-compression; exhaust-power; intake-exhaust; compression-intake.
or
power-exhaust; exhaust-intake; intake-compression; compression-power.
Either way you 2 power strokes followed by 2 unpowered.
And where TH do you put the spark plug!? Valve size/clearance issues too.

For a Blown, like to OP posted, 2-stroke, with a common exhaust port; things look way better/simpler.
But you need to mix in oil again to lube the piston.
I also wonder about all that heat in the piston with no cool/ed surface
and exhaust port with no cool-down time.

[cRiPpLe_rOoStEr]

Originally Posted by paniwew

That engine design is seriously impressive—low maintenance, direct injection, and the ability to run inverted without oil issues? Sounds like a perfect setup for aviation or even military applications.

It used to be fairly common for aircraft engines to run inverted, in order to keep propeller blades clear from obstacles on unimproved runways. Then the boxers became mainstream, so inverted engines were no longer needed. And now, when regular car engines are adapted for aircraft, usually they're matched to reduction gears which also set the propeller hub higher, which helps providing such clearance.

The redundancy of a pump and injector per cylinder also makes it incredibly reliable.

Most likely it was a matter of modularity and cost-effectiveness due to a greater parts commonality between different versions of an engine, with different amounts of cylinders. Of course reliability is also benefitted by such measure.

Would love to see how this performs in real-world testing.

As it has already been FAA certified, most likely it won't be too hard to find info. AFAIK it's not classified info.