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VVWC :: View topic - 2 stroke "opoc" engine for your VW ?
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2 stroke "opoc" engine for your VW ?

 
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Turbo
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Joined: Oct 28, 2003
Posts: 3022
Location: Victoria B.C. Canada

PostPosted: Fri Apr 11, 2014 6:33 am    Post subject: 2 stroke "opoc" engine for your VW ? Reply with quote

Anyone want an opposed cylinder opposed piston motor for their Vw ?

http://gm-volt.com/2013/04/10/science-project-opoc-engine-to-see-mass-production-by-2014/






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MikeD81
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Joined: Jul 10, 2012
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PostPosted: Fri Apr 11, 2014 9:54 am    Post subject: Reply with quote

Looks expensive and complicated with a zillion moving parts..... perfect for a VW!

Mike.
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Bussosaurus
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Joined: Aug 17, 2004
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PostPosted: Tue Apr 15, 2014 8:34 am    Post subject: Reply with quote

The marine world used this layout in an "inline", manufactured in the UK by Doxford for ship propulsion engines. I think there are one or two left working on the Great Lakes, but most have been retired as obsolete http://www.sil.si.edu/Exhibitions/Voyages/tn3-23-WmDoxford.jpg

A slightly different and more common but taller opposed piston layout was also used, first in aviation by Junkers in Germany http://upload.wikimedia.org/wikipedia/commons/2/22/Jumo205_cutview.JPG and for locomotive- industrial-marine by Fairbanks Morse in the USA http://maritime.org/doc/fleetsub/diesel/img/fig3-34.jpg

The ultimately complex development was the Napier "Deltic" layout http://www.startline.org.uk/slol74/deltic/deltic.htm

These were all port timed 2-strokes, and were considered light and compact for their day. This and a lack of a cylinder head made them ideal submarine engines, where an emergency shut down and isolation of induction air during a crash-dive could damage the cylinder head gaskets of more conventional engines. They became obsolete due to emissions, fuel efficiency and probably cost of manufacture. I worked with Fairbanks Morse earlier in my career, they were cool engines but tended to consume a lot of oil.

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haywirebutton
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PostPosted: Tue Apr 15, 2014 7:59 pm    Post subject: Reply with quote

ever see a Commer diesel built by Rootes? 3 cylinders-6 horizontally opposed pistons connected to 2 chaincoupled cranks outboard. Direct injection and scavenged with a blower like a 71 series Detroit
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Bussosaurus
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PostPosted: Tue Apr 15, 2014 9:10 pm    Post subject: Reply with quote

haywirebutton wrote:
ever see a Commer diesel built by Rootes? 3 cylinders-6 horizontally opposed pistons connected to 2 chaincoupled cranks outboard. Direct injection and scavenged with a blower like a 71 series Detroit


I've heard of Commer lorrys but not the engine. I looked it up on the googler... it's a port uniflow scavenged diesel with a unique single crankshaft and rocker arrangement. Interesting engine too!

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