Engineering consulting services for the design, analysis and testing of reciprocating

internal combustion engines and engine systems.

  • office: (858) 456-3511
  • fax: (858) 456-3512


Vronay, John C.,­ F­isher, R., Pratapas, J. and Steve Simons, “Development of an Ultra-Low Emissions System for Stoichiometric-Operated, Natural Gas-Fueled Engines Fitted with NSCR Catalysts." Presented at the 2012 Gas Machinery Conference. Austin, Texas September 30-October 3, 2012.  Read Article>>


Presentation: Development of an Ultra-Low Emissions System for Stoichiometric- Operated, Natural Gas-Fueled Engines Fitted with NSCR Catalysts:  Task 7, Field Test. Presented by John Vronay, PE at the 2012 Gas Machinery Conference.  Austin, Texas.  October 1, 2012. Read Article>>


Presentation: Low Emissions via Hydrogen Enrichment: How POTW’s Operating Engines on Biofuels can Cost-Effectively Achieve SCAQMD Rule 1110.2 NOx Levels without Catalytic After-treatment or Biogas Clean-up. Presented by John Vronay, PE to the South Coast Air Quality Management District meeting: Rule 1110.2 applied to waste water treatment plants operating engines on digas Diamond Bar, California.  February 22, 2012. Read Article >>


Vronay, John C., Exline, R., Hettenbach, L., and Porter, D., "Development of Durable, Environmentally Friendly Process for Reconditioning Large-Bore Engine Power Cylinders." Presented at the 2011 Gas Machinery Conference. Nashville, Tennessee. October 2-5, 2011. Read Article>>


Pfrang, William P., Vronay, John C., Atkinson, Jane. "Owls Head Water Pollution Control Plant Improvements to Meet PlaNYC Energy and Greenhouse Gas Reduction Goals." Presented at the 83rd Annual Water Environment Federation Technical Exhibition and Conference New Orleans Morial Convention Center New Orleans, Louisiana, USA October 2–6, 2010. Read Article>>

Vronay, John C., Pfrang, William P., Tsuchihashi, Ryujiro, Atkinson, Jane, Thompson, Jonathan, Grandner, William. "Energy Conservation and Greenhouse Gas Reduction at the Owl's Head Water Pollution Control Plant Will Lead to Energy Independence." Presented at the 2009 Water Environment Federation Technical Conference and Exhibition. Orlando, Florida. October 10-14, 2009.

Vronay, John C., Grandner, William P., Pfrang, William., Atkinson, Jane. "Energy Conservation and Greenhouse Gas Emissions Reduction at the Owls Head WPCP." Presented at the NYWEA 81st Annual Meeting and Exhibition. New York, New York. February 4, 2009.

Vronay, John C., "Challenges Facing Developers of Air/Fuel Ratio Control Systems for High Speed, Spark-Ignited, Stationary Reciprocating Engines Fitted with NSCR Systems." Presented at the 4th Annual Advanced Stationary Reciprocating Engines Conference. Downey, California. September 18-19, 2007. Read Article>>

Vronay, John C., "On the Cost-Effective Application of Modern Stress Analysis Techniques to Large-Bore Reciprocating Engine Components." ASME 92-ICE-12. Presented at the ASME Energy Sources and Technology Conference & Exhibition. Houston, Texas. January 1992.

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Contact us for solutions to your need for assistance with diesel, spark-ignited or dual-fuel engines. We have applied our expertise to engines ranging in size from less than 100 kW to more than 10,000 kW.