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WWII design is revived to make a new type of engine that uses a third less fuel

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San Diego-based Achates Power claims that its revitalised a different World War 2-era design that is cheaper, smaller, lighter, and could be 30 per cent more fuel efficient.


Pictured is a graphic representation of three of the engine's opposed-piston cylinders. The blue gas is the injection of fuel and air, while the red gas is exhaust fumes.
http://achatespower.com/

'This engine is simple to manufacture, has few parts and is less costly [than conventional engines],' President and CEO of Achates power David Johnson told Wired.

Archates'
design takes the car engine in a different direction. Its opposed piston engine works using two pistons in each cylinder instead of one.

Power is generated when the fuel and air mixture is ignited, driving the two pistons apart. Without the labyrinth of valves and camshafts of a conventional engine, the opposed piston engine is a much simpler and smoother design.






 
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I dont see how a two stroke will be "inherently low emissions" Every application of the two stroke motor including diesel has been historically dirty. Your mixing burnt and clean air together.
 

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A two-stroke engine produces twice as many power strokes per revolution as its four-stroke equivalent. This advantage leads to smaller displacement engines for similar performance, and lower in-cylinder pressure to lower emissions compared to four-stroke conventional engines.

http://achatespower.com/our-formula/opposed-piston/
 
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A two-stroke engine produces twice as many power strokes per revolution as its four-stroke equivalent. This advantage leads to smaller displacement engines for similar performance, and lower in-cylinder pressure to lower emissions compared to four-stroke conventional engines.

http://achatespower.com/our-formula/opposed-piston/

If that was true we would see them all over the place. The fact that they are being outlawed for the emissions proves it. I love two strokes but they are a dirty motor.
 
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ignore
 
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A two-stroke engine produces twice as many power strokes per revolution as its four-stroke equivalent. This advantage leads to smaller displacement engines for similar performance, and lower in-cylinder pressure to lower emissions compared to four-stroke conventional engines.

http://achatespower.com/our-formula/opposed-piston/

I know too much about two stroke motors. ( I use to be a marine mechanic) OMC But Iguess they figured some stuff out

http://achatespower.com/wp-content/...iston_two-stroke_diesel_engine_advantages.pdf
 

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Thats the point of revisiting this design. Burning 30% less fuel means a reduction in emissions. Also the way the gasses are exhausted. This vid explains it best i think.

 
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You still have to get past mixing chamber inefficiencies. But I guess they did some how.

Years ago they came out with what known as loop charge. They were able to get 300Hp out of 160 c.i with is crazy powerful
 
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I dont know what happen :shadedshu:
 
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Thats the point of revisiting this design. Burning 30% less fuel means a reduction in emissions. Also the way the gasses are exhausted. This vid explains it best i think.


Well at least it means that there's hope we'll have combustion engines for a little bit longer than expected with this green craze going on.

I mean, screw the homeless Vietnam veterans dying in gutters, we need to 'save the planet' for some strangers hundreds of years from now!
 
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Well at least it means that there's hope we'll have combustion engines for a little bit longer than expected with this green craze going on.

I mean, screw the homeless Vietnam veterans dying in gutters, we need to 'save the planet' for some strangers hundreds of years from now!

There not as far along as they want to believe in the green tech. Oil will be around for many years. But if we can get China on board that would be cool

 
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There not as far along as they want to believe in the green tech. Oil will be around for many years. But if we can get China on board that would be cool

Nah, they never are, but they make the rest of us normal people suffer the throat shoving nonsense, higher costs for things and increased regulations (lack of freedoms).

You'll struggle to find people who can quantify what it all means in their day to day life, unless they live in such horrendous conditions that the air has become toxic. Though something tells me that Billy Joe and his dirt bike riding friends aren't the culprit for Beijing's smog.
What also helps us fight off this green invasion, is that the car enthusiast market is massive and a large percentage will always love combustion and classic engines.

I just hope it doesn't become an antique market.
 
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I'm still pissed at Tesla with its government subsidies producing a $80,000 electric car that only wealthy people that don't pay taxes can afford
 
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Some type of irony in that isn't there?

Though overall this type of engine modification is awesome. Cool stuff for sure.
 

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If that was true we would see them all over the place. The fact that they are being outlawed for the emotions proves it. I love two strokes but they are a dirty motor.
I've been banned before, for to many emotions. However I am WAY MORE than two stroke.
 
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San Diego-based Achates Power claims that its revitalised a different World War 2-era design that is cheaper, smaller, lighter, and could be 30 per cent more fuel efficient.


Pictured is a graphic representation of three of the engine's opposed-piston cylinders. The blue gas is the injection of fuel and air, while the red gas is exhaust fumes.
http://achatespower.com/

'This engine is simple to manufacture, has few parts and is less costly [than conventional engines],' President and CEO of Achates power David Johnson told Wired.

Archates'
design takes the car engine in a different direction. Its opposed piston engine works using two pistons in each cylinder instead of one.

Power is generated when the fuel and air mixture is ignited, driving the two pistons apart. Without the labyrinth of valves and camshafts of a conventional engine, the opposed piston engine is a much simpler and smoother design.








The biggest issue is there is MORE rotating mass and wearing surfaces, so you halve the MTBF and unless the engine is going to be mounted like a boxer engine, (which already has oil management issues) you won't be running too long as the cylinders will fill with oil on the top and start all sorts of fun.

I bet there is a reason why good engineers haven't used this design, for example, if its forced induction how do we prevent excess fuel from entering the exhaust and burning up a turbo (unless we direct inject it, kinda like they show,)? Direct injection has its own problems with an engine like this, first being how much pressure is in the cylinder as a lot of air blows out from inlet pressure, and all of the features they claim to have, can be overcome by direct valve actuation and or forced induction.
 

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The biggest issue is there is MORE rotating mass and wearing surfaces, so you halve the MTBF and unless the engine is going to be mounted like a boxer engine, (which already has oil management issues) you won't be running too long as the cylinders will fill with oil on the top and start all sorts of fun.

I bet there is a reason why good engineers haven't used this design, for example, if its forced induction how do we prevent excess fuel from entering the exhaust and burning up a turbo (unless we direct inject it, kinda like they show,)? Direct injection has its own problems with an engine like this, first being how much pressure is in the cylinder as a lot of air blows out from inlet pressure, and all of the features they claim to have, can be overcome by direct valve actuation and or forced induction.
Balancing such an engine would be a bitch. I love the flat-4 in my Subaru Impreza. Naturally balanced. :toast:

...and for the record, I almost never have to put extra oil in my car. They revised the piston ring design in 2014 I think (mine is a 2015.)

Edit: This looks different than the designs I've seen in the past where the second piston is moving a different speed on a different crank to radically alter the compression cycle. This appears to be a bit different than that. I assumed its balance would suck because I thought it was another kind. My bad.

Edit 2: I was thinking about this: https://en.wikipedia.org/wiki/Six-stroke_engine
 
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It's still going to puke dirty smoke out of it. I'm sure they'll do something smart like adding catalysts to it to negate any kind of efficiency it really has.
 
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It's still going to puke dirty smoke out of it. I'm sure they'll do something smart like adding catalysts to it to negate any kind of efficiency it really has.
several things have changed since 2stroke was popular.
low-sulfur/biodiesel has become more prevalent.
O2 sensors in exhaust allowing for more accurate Fuel/Air mixtures and recycling of unburnt fuel in exhaust.

just being able to adjust the fuel/air ratio on the fly is a huge gain in emission improvement over the stuff we used to have.

while cats do restrict airflow the gain in performance by removing them isn't all that its cracked up to be on a properly tuned engine. or rather i can say it had less than a 10% improvement on my '09 fatbob. the biggest limitation on power from the stock bike was getting rid of the crappy CARB mandated fuel mapping(tuned before and after the cat removal).
 

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recycling of unburnt fuel in exhaust.
That's a pretty important one in 2-stroke engine and that usually limits you to a pretty narrow power band. With modern engine with things like variable valve time and variable valve lift (or both,) you get a lot better efficiency than you did with just ignition timing alone. I honestly thing that getting rid of valves is a mistake and that solenoid actuated valves is what's going to get us the most benefits.
 
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Storage EVO 840 500gb, EVO 850 500gb, Perc 710 Raid WD RED 4tbx4
Case Corsair 500r
Power Supply Antec 850
Mouse Logitec G502
Keyboard a cheap dell
That's a pretty important one in 2-stroke engine and that usually limits you to a pretty narrow power band.
the smaller power band is less of an issue in more modern transmissions with much better shifting patterns and additional gears.

additionally in more static rpm applications like an electric vehicle with a generator to charge from this is also not really an issue.
 
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