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05-25-2010, 04:41 PM
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Join Date: Oct 2008
Location: Fresno, CA
Posts: 479
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Opposed Piston Cylinder Engine
Check out this engine in development by the company, EcoMotors.
Looks like the majority of their financing is done through the Department of Defence. Looks like it could be a promising engine in the future.
http://engineeringtv.com/video/Oppos...posed-Cylinder
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Rick from Fresno
RV-7A
The art to flying lies in learning how to throw yourself at the ground and miss.
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05-25-2010, 06:02 PM
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Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 1,017
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Huh, interseting. Back to the large cheeks ala -4's.
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Carlos in Arizona
EAA Chapter 538 www.chapters.eaa.org/eaa538
Wittman Tailwind W8 N53CH (built & sold)
Pazmany PL-1 N2029 (bought & sold)
RV7 - N537TC (reserved & building)
Emp, Wings & Fuse done - working on FWF
"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
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05-25-2010, 07:23 PM
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Join Date: Jun 2006
Location: Castaic, CA
Posts: 549
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James Atkinson would be proud...he designed and patented an engine with opposing pistons in the 1880's. Although his differential engine was a 4 stroke, it just shows that there is not much that has not been tried...we just get better at it as time goes on 
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Mike Sumner
Castaic, Ca
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05-25-2010, 07:27 PM
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Join Date: Oct 2006
Location: Melbourne, Australia
Posts: 426
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definitely not much new out there...
I've been reading a book first published in 1933 that describes a production common-rail diesel fuel injection system with electromagnetically actuated injectors!
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05-25-2010, 07:38 PM
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Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
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Not much truly "new" out there
Electric vehicles, hybrid vehicles?
http://tinyurl.com/2d9pr6m
John Clark
RV8 N18U "Sunshine"
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05-25-2010, 08:33 PM
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Join Date: Jun 2006
Location: Castaic, CA
Posts: 549
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There were electric vehicles before the Model T!
Quote:
Originally Posted by John Clark
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Mike Sumner
Castaic, Ca
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05-27-2010, 01:29 PM
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Join Date: Oct 2009
Location: Colorado
Posts: 40
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Confused
It is my understanding that a piston's stroke is somewhat tied to its diameter. Compression either too high or too low becomes the limiting factor. If you have two pistons won't each have to travel 1/2 of that distance? If the throw of the crank is one half doesn't that then reduce the available torque? I don't see the advantage to this engine. What am I missing?  |
05-27-2010, 01:37 PM
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Join Date: Jun 2006
Location: Castaic, CA
Posts: 549
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Torque does not seem to be a factor in designing this engine. They appear to be going for high HP per weight and economy. 2 strokes give a power every stroke and typicaly have less losses by having less moving parts. I'm going to guess this will be a pretty high RPM motor since the usual limiting factors (piston speed) have been changed.
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Mike Sumner
Castaic, Ca
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05-27-2010, 07:41 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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