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Liquid piston engine Options
#1 Posted : Monday, October 13, 2008 6:51:10 AM
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Posts: 134,494

I see, in the Mother Earth News classifieds, and ad for a liquid piston engine made from pipe fittings at www.growbiz-abco.com

Has anyone tried this or have any knowledge beyond what is on their web page ?

#2 Posted : Monday, October 13, 2008 6:51:10 AM
Rank: Guest

Posts: 134,494
I've looked at others on the internet and there are advantages and disadvantages.

 1. The liquid fills gaps and means you can use less precise parts.
 2. Easier to contain a gas other than air.
 3. Liquid can also be used for the heat transfer medium.

 1. Less efficient since the liquid has a higher viscosity
 2. Less precise parts are less efficient anyway.
 3. Lower power levels for a given size/efficiency.

Personally I'm planing a gear pump driven R290 freon system for my "ground source" sterling engine generator. In my case one of the few liquids that would be compatible is mineral oil and that's too viscous for anything other than a lubricant.
I'm also planing on using the patented two valve gravity system instead of a recovery/makeup pump.

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