new diesel engine?

[clbanman]

http://www.news.com/8301-11128_3-9857580-54.html?tag=nl.e501

[Turbinepowered]

Biggest problem with the opposed piston design is how to get the huge compression you need... and have a place for the valves. The Jumo engine was two-stroke. Fairbanks-Morris had opposed piston engines. Comer trucks even had single-crank opposed piston engines for their trucks, but all the OP designs to date have been two-stroke.

Two-stroke engines can't meet modern emissions for cars, so until they get that figured out it's just vaporware.


[edit] Also, the garbage about Transonic is just BS. "Increases the mileage up to 100mpg" my bus-driving arse. In what car? With what vehicle weight? Some ultralight carbon-fiber and prestressed aluminum bathtub? Please, how gullible do they think we are?

[Double-edit]

"The opposed-piston engine was invented by Hugo Junkers around the end of the nineteenth century," one of the patent applications states. "In 1936, the Junkers Jumo airplane engines, the most successful diesel engines to that date, were able to achieve a power density and fuel efficiency that have not been matched by any diesel engine since...Nevertheless, Junkers' basic design contains a number of deficiencies."

Another airborne diesel beat the Jumo engine quite handily, and to date is in the running for highest thermodynamic and fuel efficiency in an internal combustion engine. Napier Nomad, twelve cylinder opposed cylinder (Flat twelve) supercharged 2-stroke aircraft diesel.

See also, 14 cylinder ship-engine diesels. I believe they're actually rated at over 50% thermodynamic efficiency, whereas the Jumo was only maybe in the mid-thirties.

These folks need to get their history right.

[OM617]

Junk science is exactly what it is.

Its just not possible to get a 100% increase in fuel economy from the same engine without a huge sacrifice of power and a huge reduction in weight.

[jtanguay]

"In 1936, the Junkers Jumo airplane engines, the most successful diesel engines to that date, were able to achieve a power density and fuel efficiency that have not been matched by any diesel engine since...Nevertheless, Junkers' basic design contains a number of deficiencies."

 :lol:  yes... never been matched by any diesel engine since?  :roll:

[jimfoo]

I have a very old Popular Mechanics that tells you how to make an opposed piston, I think one cylinder, diesel 2 stroke engine that runs on acetylene. No crankshaft though as it's a 90 hp jet engine.

[Northern RD]

http://www.iet.aau.dk/sec2/junkers.htm

Enjoy!