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Old 10-08-2017, 09:45 AM
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Default Cummins 2 stroke Diesel developed for military

This looks interesting.

Cummins developing revolutionary new diesel engine for U.S. Army | Fox News


VIDEO at link >>> https://www.youtube.com/watch?v=JoQkTIfAB2U
Quote:
. . .

The Advanced Combat Engine (ACE) project is a joint venture between Cummins and California-based Achates Power, who has designed an opposed-piston engine that works on a two-stroke combustion cycle and eliminates the need for a valvetrain.

There are two pistons in each cylinder that compress the air-fuel mixture between them. The movement of the pistons exposes intake ports at the bottom of their strokes, while a direct fuel injection system adds ads diesel as the piston heads come together. A series of gears connect cranks at the top and bottom of the engine to a common output.

According to Achates, eliminating the head reduces heat loss and improves the thermal efficiency of the engine. Cummins says it is targeting a 21 percent reduction in thermal rejection, along with a 50 percent increase in power density and a 13 percent jump in fuel efficiency compared to engines currently in use.

. . .
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Old 10-08-2017, 10:40 AM
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Default Re: Cummins 2 stroke Diesel developed for military

Makes me wonder if Detroit diesel is pursuing this design? After all they were the top 2 stroke diesel maker.
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Old 10-08-2017, 12:08 PM
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Default Re: Cummins 2 stroke Diesel developed for military

Given the added efficiency, I also wonder if there are civilian car/light truck uses for this technology in the near future?

Obviously it would have to be able to pass emissions certification for civilian uses but since diesel is already economical and efficient, a 50% power increase combined with a 13% increase in efficiency would make for an impressive vehicle engine that could run long distances on little fuel.
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Old 10-08-2017, 01:28 PM
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Default Re: Cummins 2 stroke Diesel developed for military

Emissions is what killed the 2 stroke Detroit.
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Old 10-08-2017, 11:13 PM
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Default Re: Cummins 2 stroke Diesel developed for military

Did some research on it and it sounds interesting. They're also working on a 2 stroke compression ignition gas powered one.
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Old 10-09-2017, 07:37 AM
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Default Re: Cummins 2 stroke Diesel developed for military

Fairbanks Morris built engines with this general design back before WW2. They were large stationary engines, and they were used on large electrical generators. I remember running across several of them in salvage yards, and at first wondered why any engine would have an upper and lower crankshaft..

There is also another engine design out there with twin opposing pistons in the same bore. It is called the "Opoc" I believe. Here is that one...


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