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Old 02-02-2011, 08:53 AM   #1 (permalink)
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2 Stroke - 40% efficiency ICE - 100mpg

Check it out.

Saving the World Two Strokes at a Time at Hemmings Blog – Classic and collectible cars and parts

For a good demo, See:

Watch "Opposed Piston Opposed Cylinder Engine" Video at Engineering TV

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Old 02-02-2011, 06:32 PM   #2 (permalink)
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That video says a lot more about the engine than the web page did. Thanks for posting it; sounds pretty neat if they can make it reliable!

I wonder what the thermo efficiency of a turbo-diesel is, anyway? Or for a two-stroke turbo-diesel?

-soD
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Old 02-02-2011, 07:44 PM   #3 (permalink)
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Say what? 40% BTE will get them about 55mpg combined in something like a Prius, assuming they keep the engine in the same range of loads/speeds. 100mpg would require something about half the weight/CdA.
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Old 02-03-2011, 07:31 AM   #4 (permalink)
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It appears that this idea keeps showing up in the media, but never in vehicles...

New 2-stroke Diesel engine, cool link to Engineering TV

Opposed-piston opposed-cylinder engine claims 50% FE increase
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Piwoslaw's Peugeot 307sw modding thread

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Old 02-04-2011, 10:07 AM   #5 (permalink)
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Quote:
Originally Posted by some_other_dave View Post
That video says a lot more about the engine than the web page did. Thanks for posting it; sounds pretty neat if they can make it reliable!

I wonder what the thermo efficiency of a turbo-diesel is, anyway? Or for a two-stroke turbo-diesel?

-soD
TDIs are around 40-45% efficient over a fairly wide range. Spark Ignition ICE aka Gasoline engine tend to be around 35-37% at peak efficiency.

I'm pretty psyched about the horizontally opposed engine, although I'm not too happy that they're diesel only, I suppose it could be adapted to alcohol if that ever takes off.
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Old 02-04-2011, 11:34 AM   #6 (permalink)
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Quote:
Originally Posted by Piwoslaw View Post
It appears that this idea keeps showing up in the media, but never in vehicles...

New 2-stroke Diesel engine, cool link to Engineering TV

Opposed-piston opposed-cylinder engine claims 50% FE increase
Oopps, I didn't realize that this was that old. (my bad)

Seeing that the military has first dibs, it will probably be quite some time before it is released to the general public, if ever.

The prospects of a small and efficent high horse power engine like this is still intriging to say the least.

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Old 02-07-2011, 12:08 AM   #7 (permalink)
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Get back to us when you find a way to make a two-stroker pass the EPA HC emission standards.

Why do you supposed the two stroke engine disappeared from the road in the first place?
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Old 02-07-2011, 03:44 AM   #8 (permalink)
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Originally Posted by Big Dave View Post
Get back to us when you find a way to make a two-stroker pass the EPA HC emission standards.

Why do you supposed the two stroke engine disappeared from the road in the first place?
Why 2-Stroke Direct Injection is a Big Deal
Bourke Engine
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Old 02-07-2011, 02:19 PM   #9 (permalink)
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Originally Posted by Allch Chcar View Post

I'm pretty psyched about the horizontally opposed engine, although I'm not too happy that they're diesel only, I suppose it could be adapted to alcohol if that ever takes off.
What's your issue with diesels?
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Old 02-11-2011, 06:11 PM   #10 (permalink)
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Two stroke, direct injection, uses a supercharger for scavenging rather than bottom of the piston, no need to mix oil and fuel.

You just described a 6-71 Detroit Diesel. Same thing with opposed pistons is a Fairbanks-Morse diesel. Detroits had a high power-to-weight ratio as diesels go. F-Ms will run on anything remotely oily. Neither was particularly clean.

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