diesel marine engine

[MrSethious]

let me ask something... its direct combution?

[andrewbthomson]

@MrSethious its direct injection if thats what you mean, (maby called direct combustion in america?) a non direct injected engine injects fuel into the inlet manifold, as you can see the fuel is injected streight into the cylender in this vid. there are many advantages to direct injection, it gives you a much more controllable burn.

[WeRideTonite]

@Frederik19951995 no, crankcases have an overflow through which expanded gases escape when the air in it heats up, any air that's being sucked in can be blown out as well ;)

[schatzschutz]

The 'ol in and out!

[Frederik19951995]

I have a question: What about the vacuum in the crankase, when the piston moves up??

vaccum in crankase = Makes it difficult for the piston moveing up ?? Am i wrong?

[MirceaD28]

@Frederik19951995 . Yes but when a piston goes up to create a vacuum, another is going dawn, canceling that vacuum. Even so, on some motorbikes with one piston, they are running, don't they?! The heat cause by the engine makes the air expand, and many others things canceling that piston effect. Probably i am wrong.

[Renwysocki]

Wartsila is a two-stroke engine, not four times, as shown in your drawing.

[TheKILLA317]

@Renwysocki Wartsila is a two stroke diesel engine not a four stroke .

[douro20]

@TheKILLA317

They make both.

[Gpoint177]

this is 4 stroke, 2 stroke is twice efficient than 4 stroke with the same fuel consimption but 2 strokes doesnt like variable forces, but 2 stroke has less ability to burn air/fuel mixture so 4 stroke engine is applied in more manouvable vessels than 2 stroke, 2 stroke principle is applied in big vessels with big engine room.

[woodscritter]

@Gpoint177

Start over- your studies, that is. Ye'r clueless about differences between 2- & 4-stroke diesels.

(As are most.)

[2two1one0zero]

@woodscritter No, this is obviously a four-stroke engine.. 2-stroke cycle is completed in ONE revolution. Combustion of fuel and compression of air take place at the same time. The engine above makes TWO revolutions, one for compressing air and another one for fuel combustion. Start over your studies.

[cubanboy740]

Sexy

[marjianto89]

some of your explanation was not definitely correct. Injector was injected liquid fuel into cylinder head by fuel injection pump around 4 degress just before TDC, not during combustion. Whether injector is inject during combustion is totaly wrong caused fuel cam shaft was not on the top when inlet valve and exhaust valve closed. Whether like this idle gear position during instalation is totally wrong. Scavenging process also i'm not sure.

[marjianto89]

lol 1 Hp= 0,736 kW, 80,000kW= 108,843 HP

[cubanboy740]

@marjianto89 Explain how you arrived at this answer.

[ajinkya3d]

aal is vel

[DionysiosA76]

wartsila is crazy! they have engines up to 26000hp!

[TheChiefEngineer]

they actually have engines up to around 80,000hp i believe. The RT-Flex96C is the largest in the range.

[DionysiosA76]

..beast. your talking about the big I-14 right?

[TheChiefEngineer]

apologies, i was actually incorrect. I meant 80,000kW. So thats around about 108,920hp. I'm not sure excactly what you mean by I-14. Is that another name for the engine (perhaps one built under licence) or is that a ship with one of these huge engines as a power plant?

[DionysiosA76]

Inline-14 cylinder...

[TheChiefEngineer]

ohh right ok,im with you now! lol. yeah, the biggest has 14 cylinders. its a really interesting engine. MAN B&W also produce an electronic engine, which is quite similar to the Flex.

[justforever96]

So what does the "flex" in the RT-Flex96C signify? Is that like "flex fuel"? As in it can burn Bunker-C and other fuels as well? Also, what do you mean by "electronic engine"? I'm new to the whole low-speed diesel thing. Is that like computer-controlled timing or something? Regarding the guy who says B&W makes a bigger (131,000hp) engine...the "biggest" in the Flex may have to do with the cylinder size rather than the actual output. That's just a guess though, I'm going to look into it.

[TheChiefEngineer]

The "flex" signifies the flexibility of the engine to operate efficiently over the entire load range by varying the injection and exhaust valve timing. The engine is pretty much smokeless at all loads. With increasingly stringent air pollution regulations, namely NOx emissions, it has become necessary to produce an engine that can easily and readily be optimised throughout its entire range. The Flex engines are just the RTA engines but modified.

[TheChiefEngineer]

With regards to burning different fuels, all bunkers are different. There is no consistency in quality. So you are correct in thinking it's to do with burning different fuels. That is where the electronic control comes in. Instead of the camshaft and jerk type fuel pumps, the engine is fitted with a common-rail fuel system and electronically controlled hydraulically actuated exhaust valves as opposed to cam driven gear of days gone by.

[TheChiefEngineer]

It is my belief that Wartsila took the decision to only build 13 and 14 cylinder versions of the flex design, although they do come in different bore sizes. I don't know about the MAN B&W electronic engines, as I have only worked on the 10K90MC-C Mk5, which has a camshaft and jerk-type fuel injection pumps.

[johnsenkenn]

The chief.

B&W have a 14 cylinder 131,000 hp, this should be the largest so far, what I know.

[TheChiefEngineer]

Really? wow, I didn't realise they had one of 131,000 hp. That's considerably more powerful than the Flex. I appreciate you telling me that, thank you :)

[julianleeho]

so there is no spark plugs?

[TheChiefEngineer]

No spark plugs in a diesel engine. The high compression of the air in the cylinder causes the temperature to rise to a point where the diesel will ignite when injected into the cylinder.  In other words, hot air ignites the fuel. Sorry I cant explain that much simpler. :)

[julianleeho]

thanks a lot! u dont have to explain it much simpler... thats good