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[Anonymous]

IS THIS TRUE
In most locomotives today an engine called a two-stroke engine is used.
OR
is a four-stroke engine used according to Rudolf Diesel[xx(]


Also how come in a two-stroke engine cycle theirs only a intake valve i cannot find the exhaust valve.[:)][8)][:(][V][B)][xx(]

[Anonymous]

QUOTE: Originally posted by farraris

IS THIS TRUE
In most locomotives today an engine called a two-stroke engine is used.
OR
is a four-stroke engine used according to Rudolf Diesel[xx(]


Also how come in a two-stroke engine cycle theirs only a intake valve i cannot find the exhaust valve.[:)][8)][:(][V][B)][xx(]

I answered this question for you in the teen thread. [;)]

[nssr9169]

boath are used depends on the loco...early EMD's are all 4 stroke.......And GE used 2 stroke(and still does) And EMD switched to 2 stroke also.........in the late 80's but I sugjest if ya want to learn more go onto GE's or EMD's web page for more info........Because people are getting tired of answering the same questions ....................[;)]

[David_Telesha]

QUOTE: Originally posted by nssr9169

boath are used depends on the loco...early EMD's are all 4 stroke.......And GE used 2 stroke(and still does) And EMD switched to 2 stroke also.........in the late 80's but I sugjest if ya want to learn more go onto GE's or EMD's web page for more info........Because people are getting tired of answering the same questions ....................[;)]

That is totally incorrect.

ALCO and GE have always been 4 stroke.

EMD's even the early ones were 2 stroke...

[Anonymous]

Thanks I will go and search up what EMD's and GE's are. Also do you know why a Diesel does not have and intake valve or an exhaust valve because it is missing one. Or are those only in a fourstroke engine cycle?

[chad thomas]

There are no exhaust valves because they exhaust through holes in the cylinder wall that are exposed at the bottom of the piston stroke. When they are exposed a pressure wave travels down the exhaust passage & manifold. After this happens the intake valve opens and the vaccume behind the pressure wave scavages the cylinder and pulls in the fresh air for the next combustion. With a turbo or a supercharger the intake air is also under pressure and more of it will get into the cylinder, thus more fuel can be injected for a more powerfull combustion.

EMDs have traditionaly been 2 stroke cycles. The newest H series engine is a four stroke cycle design though.

[PBenham]

QUOTE: Originally posted by farraris

Thanks I will go and search up what EMD's and GE's are. Also do you know why a Diesel does not have and intake valve or an exhaust valve because it is missing one. Or are those only in a fourstroke engine cycle?

They are found on all two or four cycle engines, it is just that the intake passages(rear port, on an EMD) are inside the engine block and out of view. Exhaust is scavenged out through the exhaust port on the side of the cylinder wall(front port on an EMD) also located in the block. That's why two-cycle EMD normally aspirated engines had roots blowers FYI, Fairbanks-Morse OPs used this same principle to route exhaust out of the cylinders and fuel in. The 4 stroke Alco,(McIntosh & Seymour and Alco 244,and 251power plants),Baldwin (DeLaVergne),GE (Cooper-Bessemer) and Lima-Hamilton use exhaust manifolds, similiar to those on automobile or light truck engines. The "conventional" intake valves (cast integrally with the injectors on a GE) are plainly visible on all the four stroke engines mentioned, which accounts for their sounding more powerful (and interesting).

[nssr9169]

QUOTE: Originally posted by David_Telesha

QUOTE: Originally posted by nssr9169

boath are used depends on the loco...early EMD's are all 4 stroke.......And GE used 2 stroke(and still does) And EMD switched to 2 stroke also.........in the late 80's but I sugjest if ya want to learn more go onto GE's or EMD's web page for more info........Because people are getting tired of answering the same questions ....................[;)]

That is totally incorrect.

ALCO and GE have always been 4 stroke.

EMD's even the early ones were 2 stroke...

Ok so I had them reversed BUT EMDs new engine block(gm16v265h) IS A 4 STROKE...........

http://www.emdiesels.com/en/pmi/diesel_engines/
See for yourself.......


(EMDs offical company web page)

[David_Telesha]

Fine.. But thats not what you said in your original post... Even if you reversed what you said in your post, its still wrong according to you now...

[nssr9169]

sorry that I got I wrong I will never make that confusion again......Ya live / learn..............ok?

[Anonymous]

chad thomas & PBenham thanks I understood that really easily :) but one question chad thomas where does the hot air get stored if it sucks it up into the intake valve. Does it just get stored somewhere or will it leave through the holes in the cylinder?