2.5ccm DA Drabant (David Andersen, made in Norway) diesel engine for model airplane

Unlike 4-stroke diesel engines, 2-stroke diesel engines use a 2-stroke Diesel cycle, and are much more energy efficient (50% efficient as opposed to 35% of 4-stroke Diesel engines). The 2-stroke Diesel engine cycle differs significanly from 2-stroke gasoline engines as they do not mix lubricants with the fuel. They hence avoid all of the extra pollution (compared to 4-stroke engines) that normally occurs in the case with gasoline engines. This, unlike gasoline 2-stroke engines, makes them a appropriate technology 2-stroke engines.

Types[edit | edit source]

As a appropriate technology, only 2 types of engines are suitable: the 2-stroke trunk piston (these btw also come in 4-stroke versions, but we won't go into that) and the 2-stroke (uniflow or loop scavanged) crosshead Diesel engine. Both need to be made to use indirect fuel injection.

Both the 2-stroke trunk piston and crosshead Diesel engines, but especially the last engine have the advantage of being able to use all types of liquid biofuels (including pure plant oil, cleaned and even uncleaned waste vegetable oil). We will describe only the crosshead Diesel engine in this article, as the trunk piston engine is less suitable.

Design charisteristics[edit | edit source]

Unlike what one would expect, the design of the 2-stroke crosshead Diesel engine is actually very uncomplicated. The loop scavanged crosshead Diesel engine is even a bit simpler in design as the uniflow crosshead Diesel engine, as it has no valves at all, however as the effiency is less, the use of the uniflow crosshead Diesel engine is preferred.

Criticism[edit | edit source]

The 2-stroke crosshead Diesel engine has a very bad reputation on pollution/emissions. they are generally being used today in large ships. However, they are generally run on very poor quality (undistilled) petrofuels, which causes the huge amount of pollution/emissions. The engine itself however is extremely well designed. As such, when running on biofuels (ie SVO, WVO -either cleaned or uncleaned-), air pollution is minor, and emissions are almost entirely eliminated.

See also[edit | edit source]

Further information[edit | edit source]

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Keywords energy conversion, motors, engines, diesel, energy
SDG SDG07 Affordable and clean energy
Authors KVDP
License CC-BY-SA-3.0
Language English (en)
Translations Slovenian, Arabic, Portuguese, Hungarian, Thai, Chinese, German
Related 7 subpages, 10 pages link here
Impact 2,910 page views
Created August 23, 2012 by KVDP
Modified October 23, 2023 by Maintenance script
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