Latest revision as of 19:42, 1 October 2023

Design Considerations

Potential for Hydrogen operation - [1]
In July 2021, Cummins was awarded an $87M contract by the United States Army to complete the development of the Advanced Combat Engine (ACE), a modular and scalable diesel engine solution that uses opposed-piston technology. [2]
Typical 4 stroke fuel-specific oil consumption is .1 percent, and opposed piston engines need to match this to be competitive [3]
Oil scraper rings are used on outboard side in opposed-piston engines [4]
Texturing of bore is i.portant. plateaus work better. Laser etch adds more retention. See above link.

Piston-ported exhaust, air bearing-piston, with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need Hydraulic Accumulator for smoothing.
Lubrication is via hydraulic fluid, which addresses the lubrication and oil-burn issue of regular 2-strokes, as no oil is used in the fuel

@@ Line 8: / Line 8: @@
 =OSE Proposal for Hydrogen Hydraulic Engine=
-*Piston-ported exhaust with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need [[Hydraulic Accumulator]] for smoothing.
+*Piston-ported exhaust, air bearing-piston, with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need [[Hydraulic Accumulator]] for smoothing.
 *Lubrication is via hydraulic fluid, which addresses the lubrication and oil-burn issue of regular 2-strokes, as no oil is used in the fuel
+=Free-Piston=
+*https://en.m.wikipedia.org/wiki/Free-piston_engine
+*Hydraulic version - Innas makes a Free-Piston hydraulic engine -[https://www.innas.com/phone/free-piston-engines.html]