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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 (...) (19 years ago, 26-Jan-05, to lugnet.trains)
| | | | | 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 (...) (19 years ago, 26-Jan-05, to lugnet.trains)
| | | | | 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 (...) (19 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 (...) (19 years ago, 27-Jan-05, to lugnet.trains)
| | | | | Re: BNSF new paint
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| (...) Snip (...) Atually, from what I remember of the movies we watched @ school, the air exchange can run up to about 98% clean air in a loop type arrangement. That's using something like 200% excess air in order to clear the cylinder of combustion (...) (19 years ago, 27-Jan-05, to lugnet.trains)
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