USS Silversides diesel engine start

[McBeck]

Found this...looks cool

[Eichhörnchen]

How are those exhaust ports closed off for diving the boat?

[Rhodes]

Holly diesel smoke batman!
Still running fine by sound, correct?

Eichhörnchen, I think they closed by valves inside the boat. The exhaust holes were "always open".

[Jimbuna]

Always a beautiful sound to hear

[Sailor Steve]

I didn't realize how loud they really are from the outside.

[Aktungbby]

Originally Posted by Eichhörnchen

How are those exhaust ports closed off for diving the boat?

There are hand valves inside as Rhodes states. I believe the video in the OP with the heavy swirling may be a procedure necessary to the Gato diesels known as 'scavenging' a maintenance procedure to rid the cylinders of all unburned fuel That's a lot of white smoke(supercharged air) in the video not dark indicating fuel. http://maritime.org/doc/fleetsub/diesel/chap6.htm Some opinions please.

[Eichhörnchen]

Had to be something like that I guess. Thanks, guys

[Catfish]

I believe the inventions and drawings for that Diesel came straight from VW ..

[Aktungbby]

Originally Posted by Catfish

I believe the inventions and drawings for that Diesel came straight from VW ..

Close enough!

The Fairbanks-Morse 38 8-1/8 is a diesel engine of the two-stroke, opposed-piston type.[1] It was developed in the 1930s, and is similar in arrangement to a contemporary series of German Junkers aircraft diesels.[2] The engine was used extensively in US diesel electric submarines of the 1940s and 1950s, as backup power on most US nuclear submarines, as well as in other marine applications, stationary power generation, and briefly, locomotives. A slightly modified version, the 38ND 8-1/8, continues in service on Los Angeles-, Seawolf-, and Ohio-class nuclear submarines of the US Navy. The 38 8-1/8 has been in continuous production since its development in 1938, and is currently manufactured by Fairbanks-Morse Engine of Beloit, Wisconsin.

Obviously the VW defense team has not thrown this dart out in its defense argument of the great pollution scandal....that looked like a lot of pollution on the USS Silversides; ie pollution is acceptable when it's a battlefield deterrent!https://en.wikipedia.org/wiki/Fairbanks_Morse_38_8-1/8_diesel_engine!

[Catfish]

^ that's what happens if i try to make a joke

Well i know that Mr. Elsbett invented the Junkers 205-207 high-altitude engines, Diesel engines with opposed pistons - the same Elsbett who, together with his son, invented the canola oil engine (https://de.wikipedia.org/wiki/Elsbett-Motor) that is mounted in my 1984' VW Passat (~Quantum in the US).

Since there are no more canola "gas" stations in Germany, i have to run it on Diesel, which it does, if not quite as economical. I get around 1000 miles with 60 litres of Diesel, and it was a bit more miles with pure Canola oil.
Elsbett canola oil engines were also built into Yachts, and smaller passenger ferries, up to 1990 or so.

In WW2 Elsbett developed the 205 and ff Diesel opposed pistons aircraft engines, since Diesel is better suited for high altitude without losing too much power (higher compression), also the engines reach their operating temperature faster, have a lower overall temperature, and the exhaust is not as hot as well. They are also easy to supercharge, and have very good torque. Those were all four stroke engines though.

So the opposed-piston engines of the US and Germany are of similar design, however i think it was an independent invention, and evolution (?)