Opposed piston heavy duty Diesel engine?

Nice stretch of road.
I like the short cut from Truth or consequence to Santa Rosa. Its scenic.

 

That must be why Junkers used them for aircraft engines.

 

Yes they did and they had problems getting them to hold a seal on the point of the triangle between their chambers.

 

The Jumo 204 was a popular engine in some applications from the early ‘30s until the end of the war. The Napier Culverin was a licence built 204 that went nowhere, but 3 Culverins together in a triangle was the Napier Deltic. That engine was in service with British Rail as a prime mover into the ‘80s or later.

 

I'm not saying they were a junk engine, just from what I've heard they had difficulties keeping the chamber sealed.

 

Something to keep in mind is 100hr teardowns are acceptable, in an engine for a combat aircraft. The Deltic was a way more mature development of the basic Junkers design. Daimler and BMW designs quickly outpaced the Junkers by 1940 and it was never fully developed. Pretty much the same thing Rolls Royce and Napier in-house designs did to the Culverin.

 

Dont forget the Commer TS3. That little screamer sounded kind of like a 3-53 with an exhaust pipe pinched, but reliable enough to power 3 weight classes of trucks in Europe for a couple decades. But again, an engine that saw a lot more development than the Junkers of the ‘30s.

 

you wouldn't be able to have a engine brake on that engine.

 

There's other types available.

 

no exhaust valves you cant use a more efficient Jake break, so you cant release the compression at the top of the stroke making the engine work against itself. you could restrict the exhaust and vgt a bunch of boost into it but its not going to work very well.