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 21:37:13 GMT
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Viewed:
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3075 times
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In lugnet.trains, Larry Pieniazek wrote:
> 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.
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 clear the cylinder more effectively.
However in the two cylinder one combustion chamber arrangment you can't have
cylinder head mounted valves, because there isn't a cylinder head. This is why
I'd be surprised if there were 2 stroke with exhaust values, or 4 stroke
versions of this engine design.
If there were I be all freaked out by the concept all over again.
> 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:
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> 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...
I was thinking more of doing it in Technic and seeing if I could get the
cylinders to face off like the Deltic Engine.
Thanks for all the info on this. It's really interesting stuff.
Derek
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Message has 1 Reply:
 | | Re: BNSF new paint
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| (...) Oh ya, no doubt. I think one of the reasons for this whacky two piston, one cylinder, central combustion chamber arrangement is that in an exhaust port system, with the proper amount of lag between cylinders, you can arrange the exhaust to (...) (20 years ago, 26-Jan-05, to lugnet.trains)
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Message is in Reply To:
| | Re: BNSF new paint
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| (...) 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 (...) (20 years ago, 26-Jan-05, to lugnet.trains)
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