Weird engines, cont'd

"Cé hé sin" (michael-m-mouse)
06/30/2015 at 18:15 • Filed to: Ecomotors, OPOC

Here’s a gif of an Ecomotors opposed piston opposed cylinder engine.

Now, figure out what’s doing what and why.

DISCUSSION (21)

HammerheadFistpunch > Cé hé sin
06/30/2015 at 18:18

Those long outer con rods frighten me.

Cé hé sin > HammerheadFistpunch
06/30/2015 at 18:22

Not a new idea though and they’re running relatively slowly.

Twingo Tamer - About to descend into project car hell. > Cé hé sin
06/30/2015 at 18:23

It’s labelled as an ecomotor but there are a lot of extra sources of friction here. I assume they are trying to save fuel by having one explosion moving two piatons at once?

ly2v8-Brian > Cé hé sin
06/30/2015 at 18:24

Optical illusion

ly2v8-Brian > Cé hé sin
06/30/2015 at 18:25

Kinja'd!!!

Like this engine but with a shared crankshaft.

kanadanmajava1 > Cé hé sin
06/30/2015 at 18:26

I remember this been displayed in some SAE conference years ago. If I remember correctly they were planning to use this in some kind of long range aircraft (UAV?).

It is using similar idea as the Commer TS3 but I haven’t yet decided which is weirder.

Cé hé sin > kanadanmajava1
06/30/2015 at 18:28

The TS3 is weirder because rocker arms and two conrods per cylinder.

GhostZ > Cé hé sin
06/30/2015 at 18:29

Okay, school me oppo.

Does this have... any advantages over a normal piston engine, other than maybe more swept area for the size? But does that actually make more power/efficiency?

ly2v8-Brian > Twingo Tamer - About to descend into project car hell.
06/30/2015 at 18:29

Yes. They create a combustion chamber with each other

Cé hé sin > Twingo Tamer - About to descend into project car hell.
06/30/2015 at 18:32

They claim less friction, at least on the bearings, and reduced piston speed because as you say two pistons running slower. There are still twice as many pistons and three times as many rods of course.

More here

Twingo Tamer - About to descend into project car hell. > ly2v8-Brian
06/30/2015 at 18:34

Yeah, I’m not sure that would have the gains they’re expecting it to though... Maybe the reduced piston speed as Ce He Sin said changes things.

Twingo Tamer - About to descend into project car hell. > Cé hé sin
06/30/2015 at 18:35

It’s certainly interesting but I have to admit I’m pretty sceptical. I’ll have to have a read of that link.

Cé hé sin > GhostZ
06/30/2015 at 18:39

According to this , yes

Jedidiah > GhostZ
06/30/2015 at 18:47

Maybe. It is related to piston speed / travel distance and internal friction.

There are some strange friction surfaces in this engine, but they say it has lower bearing loads and lower piston side loads.

http://www.ecomotors.com/opposed-piston…

samssun > HammerheadFistpunch
06/30/2015 at 19:00

But it should be completely balanced, right? I wonder if it’s output is closer to a 2 cylinder or 4 cylinder.

Edit: is this a two stroke?

ly2v8-Brian > Twingo Tamer - About to descend into project car hell.
06/30/2015 at 19:11

Me neither.

Toyota Sucks Lots Of Sausages > Cé hé sin
06/30/2015 at 19:47

So is this a Flat-4 or a Flat-2+2?

desertdog5051 > Cé hé sin
06/30/2015 at 20:38

2 cylinder, 4 piston, 0 valves per cylinder engines fascinate me.

gmporschenut also a fan of hondas > Cé hé sin
06/30/2015 at 22:09

I’m pulling this out of my ass. Looking that the one above has valves completely around the cylinders that would give it a great volumetric efficiency vs a traditional engine with 2, 3, 4, or 5 valves per cylinder.

Cé hé sin > gmporschenut also a fan of hondas
07/01/2015 at 04:38

Maybe so but I think the lack of heads increases the thermal efficiency.

Cé hé sin > samssun
07/01/2015 at 06:50

Yes, necessarily so.

Engines like this were relatively common in the first half of the 20th century.