8 stroke engine works
#1

Hi am Aslam i would like to get details on 8 stroke engine working
i have a seminar presentation about 8 stroke ic engine in my college .So i need your help to get details about 8 stroke engine
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#2
The term six-stroke engine has been applied to a number of alternative internal combustion engine designs that attempt to improve on traditional two-stroke and four-stroke engines. Claimed advantages may include increased fuel-efficiency, reduced mechanical complexity and/or reduced emissions. These engines can be divided into two groups based on the number of pistons that contribute to the six strokes.

In the single-piston designs, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to drive an additional power and exhaust stroke of the piston in the same cylinder in an attempt to improve fuel-efficiency and/or assist with engine cooling. The pistons in this type of six-stroke engine go up and down three times for each injection of fuel. These designs use either steam or air as the working fluid for the additional power stroke.
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#3

Best Answer: there was such a thing as a 8 stroke, actually called a hit and miss, where it was your usual 4 stroke but it only fired every other revolution, there were several designs, but basically the magic was done in the valve train and ignition system, and the help of a rather large and heavy flywheel, the more complex ones would open the exhaust valve instead of the intake valve every other revolution, thus cutting the fuel consumption in half in theory, mostly used in industrial applications where high torque and low RPM were desirable. there dinosaurs these days and can be seen in museums and private collections.



There's an 8-stroke concept engine that's been proposed, but so far no practical implementation of it (or a 6-stroke engine for that matter) exists in a form that is suitable for road vehicles.

The idea of adding more strokes than the original 4-stroke engine is as old as the 19th century. The idea is to use the thermal mass of the engine to recover some of the otherwise waste thermal energy. In a 6-stroke engine, in addition to the original 4-strokes, there's also a water injection stroke, followed by a steam expansion power stroke (basically making use of the waste thermal energy retained by the engine block to boil water and use the expansion of steam to drive further kinetic energy.

It looks like this:
1. intake (pulls in fuel and air)
2. compression (compresses the mixture)
3. power/ignition (explosive expansion of the fuel)
4. exhaust (exhaust gasses expelled
5. water intake and 2nd power stroke (pulls in liquid water, which boils and turns to steam, driving the piston)
6. steam exhaust (exhaust steam expelled)

This type of engine has greater efficiencies as less heat is wasted. But is much more complex, and requiring not only the vehicle have a supply of fuel, but also a supply of water (given that a closed-loop recondenser would be impossible given the contamination by the exhaust), and much reduced reliability given that water and steam will speed up corrosion of engine parts. There are several examples of six-stroke engines in the past, and several patents.

Some people have taken this further, and extended the system to include additional strokes driven by electrolysis of water or steam to hydrogen/oxygen, which is then burned.

It looks like this:
1. intake (pulls in fuel and air)
2. compression (compresses the mixture)
3. power/ignition (explosive expansion of the fuel)
4. exhaust (exhaust gasses expelled
5. water intake and 2nd power stroke (pulls in liquid water, which boils and turns to steam, driving the piston)
6. steam recycle (exhaust steam expelled to steam electrolysis module)
7. hydroxy gas intake and ignition (pulls in hydrogen/oxygen gas mixture from electrolysis module)
8. exhaust (exhaust water vapor expelled or recycled)

Similar to the 6-stroke concept, this kind of engine would need to be supplied water during operation, and would also require significant complexity in the form of the steam electrolysis module. Additionally, the efficiency gained by the electrolysis is not clear, as electrolysis itself requires a great deal of energy. The addition of the electrolysis step may not significantly improve efficiency of the engine, and could even make it less efficient.

In any case, 6- and 8-stroke engine concepts are not used in road vehicles because of the significant added complexity (which would make vehicles much more expensive) as well as needing a water tank (again making vehicles more difficult to use, and heavier), and reducing reliability. That's why we don't have more than 4-stroke engines.

At larger scales, such as locomotive engines, 4-stroke engines are even more efficient, reducing the benefit of going to 6-stroke. At super-large scale, such as ship engines and power plants, we go directly to external combustion and gas/steam turbines.
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