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Opposing Piston Engines

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JohnDB

JohnDB

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We are talking about radically efficient diesel engines.

What I don't know about is the oil that's supposed to be behind the Pistons... isn't that going to be bad?

 
JohnDB said:
We are talking about radically efficient diesel engines.

What I don't know about is the oil that's supposed to be behind the Pistons... isn't that going to be bad?

Click to expand...
Valves are Reed or traditional? I couldn't make out valve .
 
It is said to meet 2026 CAFE standards. Going into production this year.

Supposed to be able to replace medium duty diesel truck engines. But do so around 37 mpg.
 
JohnDB said:
It is said to meet 2026 CAFE standards. Going into production this year.

Supposed to be able to replace medium duty diesel truck engines. But do so around 37 mpg.
Click to expand...
Look the idea up. I didnt see a sump in this video.scavenging is what I don't see them mentioning.
 
They will probably be stupid expensive when they first come out and have all kinds of issues...
But in 5-10 years they will be really affordable and reliable. And then I'll get one ten to eleven years afterwards.
 
JohnDB said:
It is said to meet 2026 CAFE standards. Going into production this year.

Supposed to be able to replace medium duty diesel truck engines. But do so around 37 mpg.
Click to expand...
Wait till GM releases its 3.0 Duramax numbers... i hear it's going to be pretty impressive. 37 mpg should be attainable by 2026 but I think they will fall short of 37 for the 2019 realease.

It's an interesting concept and I'll follow this to see how durability holds up.
 
It's not new,it predates ww1.been used for trains,submarine, naval vessels for years.the brits used them in their aircraft during ww2
 
That might be a good powerplant for a diesel supercar, due to its flat configuration. Similar to Ferrari's Boxer engines (horizontally opposed cylinders).
 
These things are efficient because there's no timing belt for the valve train...
Also because of the large chamber and longer burn time less hydrocarbons are produced because of a more complete burn. So it's inherintly more efficient and cleaner.
And for a diesel...hey that's something. Maybe it won't need DEF.
 
JohnDB said:
These things are efficient because there's no timing belt for the valve train...
Also because of the large chamber and longer burn time less hydrocarbons are produced because of a more complete burn. So it's inherintly more efficient and cleaner.
And for a diesel...hey that's something. Maybe it won't need DEF.
Click to expand...
It's got gears for timing,the pistons are timed .you can time a gas,diesel with gears.noisy but reliable as only lack of oil would kill that.
 
I'm wondering about a sleeve job on one of these engines. It's not going to be a "normal job" anymore.

Used to be that when the cylinder sleeves wear out you put in new ones and a set of o-rings and you were good to go for another 100,000+ miles. This ain't gonna be as easy.
 
JohnDB said:
I'm wondering about a sleeve job on one of these engines. It's not going to be a "normal job" anymore.

Used to be that when the cylinder sleeves wear out you put in new ones and a set of o-rings and you were good to go for another 100,000+ miles. This ain't gonna be as easy.
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a wet sleeve on a diesel will last longer then 100000 miles, that's barely breaking in that block. I didn't see if , or hear if it was a wet or dry sleeve.i know with wet sleeve the additive to the coolant and also a filter is needed to stop cavitation.
 
They work on military engines, which don't have to meet the EPA pollution standards that autos do. Diesel engines are more efficient, but are not popular on US cars. What kind of a ride and acceleration will opposing pistons produce? People won't buy cars that are unpleasant to ride in.

A tank or plane has a lot of extra weight to cushion vibration from an engine.
 
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I would think an opposing piston engine would produce significantly less vibration. Each pair of pistons moving in opposite directions at the same time would cancel each other out.
 
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