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Worlds largest engine is a 2-stroke

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ez(at)embarqmail.com
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Posted: Fri Nov 16, 2007 5:35 pm Post subject: Worlds largest engine is a 2-stroke

http://people.bath.ac.uk/ccsshb/12cyl/



do not archive

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d-m-hague(at)comcast.net
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Posted: Fri Nov 16, 2007 7:24 pm Post subject: Worlds largest engine is a 2-stroke

At 07:12 PM 11/16/2007, Eugene Zimmerman wrote:



 	  Quote: 	
		  http://people.bath.ac.uk/ccsshb/12cyl/


	


Now THAT'S one impressive engine!



The crosshead is an interesting design.  The website talks it about it 

eliminating side loading on the pistons, and it does that, but it also 

isolates the space under the piston from the crankcase, so the latter can 

be oil filled.  More reciprocating mass of course, but I guess it's not 

such a big deal at only 102 rpm!  Of course piston lubrication would still 

be an issue during lean running if such an engine were a transfer port 

design (which this engine doesn't seem to be).



                                 -Dana

--

  Atheists are people who have no invisible means of support.

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Sat Nov 17, 2007 2:00 pm Post subject: Re: Worlds largest engine is a 2-stroke

Those are neat pictures, but the fact that that engine is a 2 stroke does not mean anything.   First, that engine is running at 102 RPM, and has a dedicated oil system rather than just mixing oil with the fuel.  That makes all the difference in the world in reliability. 



It is also much easier to have racks of computers and many controls on board a ship to keep the conditions, fuel flow, etc. for that engine absolutely perfect.    



So while very neat, one should not make the mistake of thinking that this engine gives any indication of the reliability the 2 stroke engines we fly.  



Mike

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