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"Liquid Piston" engine #4523539
09/22/17 08:13 PM
09/22/17 08:13 PM
Joined: Dec 2002
Posts: 40,896
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 40,896
'Stralia
Not liquid really, just the company name.

This is one of the geometries that Felix Wankel worked on...so revolutionary ain't quite the right term.


Re: "Liquid Piston" engine [Re: Shannow] #4523561
09/22/17 08:30 PM
09/22/17 08:30 PM
Joined: Jan 2009
Posts: 6,205
New England
gathermewool Online content
gathermewool  Online Content
Joined: Jan 2009
Posts: 6,205
New England
Liquid Piston: kind of an odd name. Or maybe it's really clever and too deep for me; like, a piston that's more fluid than a piston; therefore, not a piston; therefore, rotary...

Regardless, cool video.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
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Re: "Liquid Piston" engine [Re: Shannow] #4523625
09/22/17 09:57 PM
09/22/17 09:57 PM
Joined: Oct 2012
Posts: 4,622
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,622
Taiwan
Somewhere I've read or heard about giant brick built (Victorian?) sewage pumps where the sewage being pumped formed the piston and methane generated by anaerobic digestion of the sewage was the fuel. Manually operated valves, IIRC, ignited by urchins with long torches.

Or maybe I imagined it. I used to drink Kaoliang, which is wicked stuff.

Re: "Liquid Piston" engine [Re: Shannow] #4523671
09/23/17 12:16 AM
09/23/17 12:16 AM
Joined: Jul 2010
Posts: 18,724
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,724
PNW
Pretty cool design. It's "like a rotary/Wankel engine" but uses one area/pocket for the Otto cycle (hence 3 spark plugs at 120 deg apart), unlike a Wankel what uses 3 separate chambers for intake, combustion and exhaust as the rotor spins around, and one chamber with spark plugs dedicated for combustion. Wonder how it does on fuel, as the Wankel wasn't very fuel efficient for the power it made.

Re: "Liquid Piston" engine [Re: Shannow] #4523684
09/23/17 01:04 AM
09/23/17 01:04 AM
Joined: May 2012
Posts: 1,364
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,364
The land of USA-made Subies!
It's a neat concept, but since the Mazda rotary couldn't survive, I don't see how this thing could, even as a scaled up version. It appears from the intake/exhaust routing it is stuck as a single-rotor system. It only makes about 42hp/L, which even the lowliest piston engines have no problem exceeding.

The thing that gets me is they've drawn in over $12M total for essentially what was already old hat for Mazda. And there is essentially zero consumer market for this thing. Rotary-powered pit bikes maybe? smile

Re: "Liquid Piston" engine [Re: gathermewool] #4523686
09/23/17 01:06 AM
09/23/17 01:06 AM
Joined: Oct 2009
Posts: 3,947
Ohio
L_Sludger Offline
L_Sludger  Offline
Joined: Oct 2009
Posts: 3,947
Ohio
Originally Posted By: gathermewool
Liquid Piston: kind of an odd name. Or maybe it's really clever and too deep for me; like, a piston that's more fluid than a piston; therefore, not a piston; therefore, rotary...

Regardless, cool video.
if you look up GTR Mustang on YouTube you will find a video of a rare car that is a rotary turbo with pistons and headers


too many cars and oil combinations to list in 150 characters or less
Re: "Liquid Piston" engine [Re: Shannow] #4523739
09/23/17 05:42 AM
09/23/17 05:42 AM
Joined: Sep 2004
Posts: 2,427
snowblind in TX
punisher Offline
punisher  Offline
Joined: Sep 2004
Posts: 2,427
snowblind in TX
Better seal system for the case/rotor vs a Wankel. I can see why DARPA is interested in it. Light, air cooled engine is something needed for generators and portable hydraulic systems. I still have to wonder if there is something this new engine design can do that much better than the engine on my string trimmer, or chain saw, in a given application.

Re: "Liquid Piston" engine [Re: Shannow] #4523748
09/23/17 06:10 AM
09/23/17 06:10 AM
Joined: Oct 2014
Posts: 11,855
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 11,855
Idaho
A [2 stroke] Wankle. interesting


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: "Liquid Piston" engine [Re: Shannow] #4523790
09/23/17 08:18 AM
09/23/17 08:18 AM
Joined: Mar 2013
Posts: 4,776
The Midwest
skyactiv Online content
skyactiv  Online Content
Joined: Mar 2013
Posts: 4,776
The Midwest
a

Last edited by skyactiv; 09/23/17 08:21 AM.

Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: "Liquid Piston" engine [Re: punisher] #4523946
09/23/17 11:45 AM
09/23/17 11:45 AM
Joined: Dec 2016
Posts: 6,252
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 6,252
Waco, TX
Originally Posted By: punisher
.... engine design can do that much better than the engine on my string trimmer, or chain saw, in a given application.


I'll bet it costs barely $10.00 to make a cheap weedeater.
Have you have one of those engines apart?
It's amazing they work at all.
The most expensive/complicated part is the carburetor.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: "Liquid Piston" engine [Re: Ducked] #4524025
09/23/17 01:29 PM
09/23/17 01:29 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
Originally Posted By: Ducked
Somewhere I've read or heard about giant brick built (Victorian?) sewage pumps where the sewage being pumped formed the piston and methane generated by anaerobic digestion of the sewage was the fuel. Manually operated valves, IIRC, ignited by urchins with long torches.

Or maybe I imagined it. I used to drink Kaoliang, which is wicked stuff.


Far Out.


Multiple Diesel and Gasoline vehicles
Re: "Liquid Piston" engine [Re: ArcticDriver] #4524453
09/24/17 12:09 AM
09/24/17 12:09 AM
Joined: Oct 2012
Posts: 4,622
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,622
Taiwan
Originally Posted By: ArcticDriver
Originally Posted By: Ducked
Somewhere I've read or heard about giant brick built (Victorian?) sewage pumps where the sewage being pumped formed the piston and methane generated by anaerobic digestion of the sewage was the fuel. Manually operated valves, IIRC, ignited by urchins with long torches.

Or maybe I imagined it. I used to drink Kaoliang, which is wicked stuff.


Far Out.


Yeh. I hope its true.

Seems like inertia/lack of any flywheel effect might be a problem.


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