2011etec
Super Member
Watching Autoline today about engines of the future pertaining to piston motors .This company has over 100 million into development and makes sense.http://achatespower.com/our-formula/opposed-piston/#twostroke
interesting engine tech.
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grillebilly
Empty Head
Looks like it just might work. First time I've ever seen opposed crankshafts. Thanks for posting
2011etec
Super Member
They apparently have some sort of partnership with cat right now and due to non disclosure rules several other major companies are getting in there also but do not want to be named or known to be working with them at this moment.The old conventional way of building piston engines is not the only game in town and this just proves it .Will be interesting to see where this goes ,id image 100 million will not be lightly wasted.
nasadowsk
Bow:good, hunt:needs work
Yeah, the FM OP is a famous design. They might still make them? They've been used in ships, subs, locomotives, and nuke plants.
The Napier Deltic was another famous variant of the concept. It was used in the British Class 55 diesel. They sound like nothing else.
The Napier Deltic was another famous variant of the concept. It was used in the British Class 55 diesel. They sound like nothing else.
petehall347
the brandy coffee man
they have been using them in train engines for years ..the deltic engine .
knockbill
Lunatic Member
Yep,, ship I was on was built in 1957... so the FMs must have pre dated that by some years... The whole engineering dept had to help lift that top crank out to replace cylinder liners and rebuild the engines,,, I remember it well...
Here's the main engines we had... http://www.fairbanksmorse.com/engines/opposed-piston-model-38/
2011etec
Super Member
I don't think your dropping a giant marine or loco engine in a car or truck anytime soon.I get your point though .Are loco and marine diesels not 4 stroke though?The loco version would be totally useless as its a v in extremely loose terms and instead of minimizing space would take up space as the picture clearly shows.Maybe what they have done is taken the ones you've shown and improved immensely on the design .Time will tell.Sorry just checked out the link and they are 2 strokes.Actually when I first was watching the program I was thinking the motor was like my 39 evinrude which looks like a bmw bike motor.but the more I thought of it the more I realized I was confusing opposed twin with opposed piston,duh.Still its a interesting concept as there would or could possibly be almost endless possibility's.4 piston ,6 ,8 ,10,12, all packed into a compact efficient design.
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petehall347
the brandy coffee man
when someone finds the replacement for electricity for our power needs i will take notice .. i keep looking but it must be too simple to find it .
as for combustion engines i dont think we can get much better than what we already have .
on a similar note water power still steams ahead in the race for more power .. water is the best renewable we have .
as for combustion engines i dont think we can get much better than what we already have .
on a similar note water power still steams ahead in the race for more power .. water is the best renewable we have .
Also seen in German aircraft:
https://en.wikipedia.org/wiki/Junkers_Jumo_205
Diesel is facing an uphill battle around the world, "novel" designs may be especially hard hit because of the investment required to bring them to production.
https://en.wikipedia.org/wiki/Junkers_Jumo_205
Diesel is facing an uphill battle around the world, "novel" designs may be especially hard hit because of the investment required to bring them to production.
Pio1980
AK Member
Websearch "Commer knocker".
https://en.wikipedia.org/wiki/Commer_TS3?wprov=sfla1
https://en.wikipedia.org/wiki/Commer_TS3?wprov=sfla1
bshorey
Super Member
I might be missing something, but I don't see how it's inherently cleaner. If it's running ports in cylinder walls, then those tend to blow a lot of oil through the exhaust port. what about this makes it inherently clean?
Opposing pistons raise the compression, but it would seem as though having two opposing crankshafts also raises complexity. Why this config over a traditional 2 stroke?
bs
Common now, but I suspect that will change soon. Diesel market share leveled off around 2012 and most analysts are predicting a steady decline. Smog from NOx emissions is becoming a huge problem and modern petrol engines have CO2 emissions almost as low as diesels. I do a lot of work with European car makers and they're putting $$$ into forced induction gasoline direct injection and mild hybrid engine R&D.
DrumminDaddy
Hit it, Baby !!
I will venture a guess at answering your question.
A traditional two stroke has the intake and exhaust ports on the same end of the cylinder. Scavenging creates a lot of waste with some of the unburned intake charge making its way into the exhaust.
The design posted here has the intake and exhaust at opposing ends of the cylinder. That in itself changes the dynamics of the flow immensely. I could envision that being very beneficial to keeping the emissions cleaner by reducing the amount fuel/air charge slipping by into the exhaust stream.
bshorey
Super Member
From what I could see in the visualization, the ports are on opposite sides, not opposite ends. With the ports on the same side, the charge has to reverse direction to go out the exhaust port. With this design, it seems like a straight shot through. Regardless, there is bound to be something getting through to the exhaust in more than one way. First, the charge, it's being send into the combustion chamber while the exhaust port is open. Second, the oiling of the cylinder wall, that's going to escape as well.
bs
DrumminDaddy
Hit it, Baby !!
I saw intake manifolds and ports on the bottom and exhaust ports and manifolds on the top. ( both sides)
There's also parasitic losses to consider that a valve train equipped engine experiences. And even in a four stoke engine there is considerable valve overlap.
Regardless, it's an interesting design.
There's also parasitic losses to consider that a valve train equipped engine experiences. And even in a four stoke engine there is considerable valve overlap.
Regardless, it's an interesting design.
Pio1980
AK Member
Most large Diesel engines are unifow charged 2 strokes, which require an external charging pump as they cannot "breathe" on their own. The crankcase is closed with a recirculating lubricating system, and oil loss thru the porting is mimimal.
The largest diesels on the planet are uniflow 2 strokers.
http://www.autoblog.com/2011/07/22/worlds-largest-diesel-engine-makes-109-000-horsepower/
The largest diesels on the planet are uniflow 2 strokers.
http://www.autoblog.com/2011/07/22/worlds-largest-diesel-engine-makes-109-000-horsepower/
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DrumminDaddy
Hit it, Baby !!
Yes, you can see the charging pump on this design aside of the top crankshaft, belt driven. With both pistons at the "bottom" of their stroke, there's no negative pressure in the cylinder to draw in the charge.
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