Are There any Oposed piston Cummins

[Jeff H]

Just wodering?

 

[Peter Campbell]

They are weird engines. Crankshaft timing? injecting the fuel mid bore!, no cylinder head other than the other piston. I think they have very good power to weight ratios, that is why they were used on old submarines. And of course they are two stroke.

Are there locomotives that use that design still?

 

[RustyJC]

Not that I'm aware of. You're probably thinking of the Fairbanks-Morse OP-series engine. These were originally used as diesel engines in submarine service but are still being built and sold by F-M in diesel and dual-fuel configuration for industrial applications (primarily power generation). A spark-ignited, natural gas fueled version was sold under the MEP name for gas compressor drive applications in the 70's and 80's.



Rusty

 

[Alaskaskiff]

Fairbanks Morse O-P Engines

Yes, still made. but their future is undoubtedly in question with the 2004 emissions requirements, since they are a two stroke as stated. They are a good engine, but are poor in certain applications since they don't like to run well at varying loads. They like to be loaded down and run at full power with high pyro temps. A real obnoxious feature is that when turned off, about a pint of oil drips past the rings from the upper piston into the cylinder which requires the engine to be blown down through installed blow-down ports 20 minutes after securing the engine. They also require a long warm-up period (even with recirculating hotstarts). Last ship I sailed on had two of them. Very old technology, but proven, although they did have a habit of fuel leaks that liked to try and catch on fire and the oil retention liked to cause stack fires. They did not contribute to a comfortable sailing environment, and people tended to sleep lightly.

 

[Jeff H]

Ohhh