Opposed Piston 2-Stroke Engine

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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 [

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://achatespower.com/wp-content/uploads/2019/12/2019-01-0068.pdf&ved=2ahUKEwjPmM_fwtWBAxXPlGoFHbpSBMUQFnoECA4QAQ&usg=AOvVaw14FHCvPMhQXdFmyVfDimes]

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.
  • 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
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