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Dear friend,  

The reason for Water injection in 5th stroke is for give more thrust to piston by replacing liquid volume of water into very high volume of water vapour, as water evaporates quickly due to very high temperature inside engine cylinder. 

The purpose of this is to give more thrust to complete 5th & 6th stroke effectively. If we not provide this we have to go for any other mechanism to complete 5th & 6th stroke effectively. 

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2 hours ago, Kalyan Raj said:

wil there not be any problem during combustion of fuel due to the use of water?

Not at all...  As 6th stroke is exhaust stroke approx all Water vapour will exhaust into outer environment. 

And suppose some part to hot water vapour remains inside the the cylinder ( let assume 5 to 10 % of total cylinder volume) then also it will not affect the combustion of fuel as it's temperature is too high. So it didn't cools down air fuel mixture and mixture can burn efficiently... 

Like your curiosity to know something new ...  

Engineering is about questioning...   

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On 14/11/2015, 19:00:26, Aris wiyadnyana said:

Is the six stroke engine more eficience than four stroke engine ?

Of course...

There's a simplelogic behind this.

4 stroke is more efficient than 2 stroke because numbers of power strokes in 4 stroke engine are half then 2 stroke engine. 

Same way 6 stroke is more efficient then 4 stroke as in 6 stroke engine after competition of 6 stroke there's one power stroke while in 4 stroke engine after 4 stroke there's no one power stroke. 

 

Thanks, 

Dhrumil 

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Ideally Combistion product has an analysis of CO2+H2O if re compression occurs at 4th stroke and injection of H2O at 5th... What will be the composition of gas at 6th,......Are we producing safe gas emmission? ..... How about HC?

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On 2015/11/19 at 2:40 PM, Dhrumil said:

Of course...

There's a simplelogic behind this.

4 stroke is more efficient than 2 stroke because numbers of power strokes in 4 stroke engine are half then 2 stroke engine. 

Same way 6 stroke is more efficient then 4 stroke as in 6 stroke engine after competition of 6 stroke there's one power stroke while in 4 stroke engine after 4 stroke there's no one power stroke. 

 

Thanks, 

Dhrumil 

Really? I think that we cannot direct compare all these cycle as their applications are kinda different. For sure, if we are comparing all these cycle with same condition, for example same engine construction(bore-stroke ratio, total displacement, etc.) Then, yes, a 4 stroke cycle will be more efficient than 2 stroke. But in reality, the most efficient yet powerful engines are running in 2 stroke, particular in marine application. Thus, maybe the fact that the 6 stroke is more efficient, but how do we put it into practice. Before that, saying that 6 stroke is efficient then 4 stroke or comparing 4 stroke with 2 stroke maybe a little unfair.

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On 19/11/2015 at 0:10 PM, Dhrumil said:

Of course...

There's a simplelogic behind this.

4 stroke is more efficient than 2 stroke because numbers of power strokes in 4 stroke engine are half then 2 stroke engine. 

Same way 6 stroke is more efficient then 4 stroke as in 6 stroke engine after competition of 6 stroke there's one power stroke while in 4 stroke engine after 4 stroke there's no one power stroke. 

 

Thanks, 

Dhrumil 

Really? I think that we cannot direct compare all these cycle as their applications are kinda different. For sure, if we are comparing all these cycle with same condition, for example same engine construction(bore-stroke ratio, total displacement, etc.) Then, yes, a 4 stroke cycle will be more efficient than 2 stroke. But in reality, the most efficient yet powerful engines are running in 2 stroke, particular in marine application. Thus, maybe the fact that the 6 stroke is more efficient, but how do we put it into practice. Before that, saying that 6 stroke is efficient then 4 stroke or comparing 4 stroke with 2 stroke maybe a little unfair

 

 

Dear Edward,

Let me clear first that whenever we talk about a comparison we have to keep in mind that the surrounding conditions must be equal. I compared 2,4 and 6 stroke engines irrespective to the same condition. 

Second thing in your post you mentioned about "most efficient yet powerful 2 Stroke engine"  That's not a deal... Ya you can say that 2 stroke engines are more power generative but not most efficient. 

In a marine they require high power to rotate the blades against high liquid pressure on blade surface and that is why they uses 2 stroke engines. 

About putting 6 stroke in practice...  "Every product design statrs with it's demand". So whom ever has designed this have an idea about how to use it...

Again in last it's totally FAIR to compare 2,4 & 6 stroke engines in a way of fuel consumption in a SAME CONDITIONS.

 

Thanks, 

Dhrumil 

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On 11/11/2015 at 0:49 PM, Dhrumil said:

Dear friend,  

The reason for Water injection in 5th stroke is for give more thrust to piston by replacing liquid volume of water into very high volume of water vapour, as water evaporates quickly due to very high temperature inside engine cylinder. 

The purpose of this is to give more thrust to complete 5th & 6th stroke effectively. If we not provide this we have to go for any other mechanism to complete 5th & 6th stroke effectively. 

But what about the ideal working cycle for this type of engine? First we need to know about that to make any analysis.

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Have any of you ever worked on an actual IC engine? This is absurd!!

Such an engine would produce power only once in 3 crank revolutions. It would require a huge flywheel simply to keep it moving during the remainder of the time.

If this was a viable idea, why do you think it is not already in production? Someone would have already done it, except that it does not work well at all.

DrD

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I am inclined to agree that the 6-stroke engine is unfeasible. Water injection was used in 4-stroke engines to reduce combustion temperatures and increase combustion pressures in high-powered aircraft during WW2. The evaporation of the water would increase the constant pressure component of the mixed-cycle operation of the engine, exchanging heat for pressure. Unfortunately, this meant that water had to be carried on board as well, and water is heavier than fuel.

If the 6-stroke engine manages to run at all, I believe that it wouldn't be very efficient. Or it wouldn't be very powerful. Either way, it wouldn't be useful as a total system.  

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