Subject:
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Re: BNSF new paint
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 26 Jan 2005 20:45:08 GMT
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Viewed:
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2975 times
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In lugnet.trains, Derek Raycraft wrote:
> That is a very interesting consept for an engine design. I have to assume they
> are all two stroke engines. A valve assembly for something like this would be
> very strange.
Well now I'll display MY ignorance... I know that a lot of 2 cycle engines are
valveless but I did not think it was mandatory that they not have exhaust
valves.
Anyway, I am pretty sure the FM is 2 cycle, I think the Alco 244 was (but too
lazy to go look), and the GM/EMD 567, 645 and 710 (so named because that's their
displacement in cubic inches... *per cylinder*!! at least IIRC) engines are also
2 cycle. GM/EMD has switched to 4 cycle in their latest stuff though.... Here's
a link:
http://www.gmemd.com/en/pmi/diesel_engines/
(the 645 and 710 are 2 cycle, but have 4 exhaust valves per cylinder... no
Intake of course since they're fuel injected Diesel, but these are not OP,
they're conventional single piston per cylinder)
This level of detail is hard to even *suggest* at the scale we work at though.
I managed to work something in that looks like a fuel rail on my latest project
but I did nothing at ALL to suggest exhaust stuff...
++Lar
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Message has 2 Replies:
 | | Re: BNSF new paint
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| (...) They are probibly a lot more efficent when whey do have exhaust vales. A basic two stroke doesn't clear the cylinder of exhaust very efficiently. By opening the top of the cylinder through exhaust valves the rush of intake air will definitly (...) (20 years ago, 26-Jan-05, to lugnet.trains)
| | | Re: BNSF new paint
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| (...) The big advantage of a OP engine is that you get good scavange air flow via the two ends of the cylinder being open at the same time. So, yes, it is in some ways more complex (timing gears between crankshafts, rather than valves), in other (...) (20 years ago, 27-Jan-05, to lugnet.trains)
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Message is in Reply To:
| | Re: BNSF new paint
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| (...) Sorry Larry, I've had far too many M&Ms today. And I just can't stop eating them. My question was in fact was serious. I didn't understand how an engine could have two cylenders share the same combustion chamber. I realized after that I asked (...) (20 years ago, 26-Jan-05, to lugnet.trains)
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