Pinnacle opposed-piston engine
Pinnacle Engines unveiled what it calls a "breakthrough ultra-efficient engine" designed to significantly reduce fuel consumption and greenhouse gas emissions without increasing a vehicle's cost. Here's the tech behind Pinnacle's "breakthrough" engine:

The mill is based on a four-stroke, spark-ignited (SI), opposed-piston, sleeve-valve architecture that Pinnacle says cuts fuel consumption by 30-50 percent (!) compared to a conventional gasoline engine. The mill's performance has, according to Pinnacle, been independently verified by FEV, Inc.

The core of Pinnacle's technology resides in its "Cleeves Cycle," named after James Montague (Monty) Cleeves, founder of Pinnacle. The Cleeves cycle can switch back and forth from the Otto cycle (constant volume combustion) to the Diesel cycle (constant pressure combustion) depending on operating conditions. The result, says Pinnacle, is an engine that's ultra-efficient and compatible with most fuels including gasoline, diesel, natural gas, propane and biofuels.

And from the mouth of Monty Cleeves came these promising words:
This engine technology provides the fuel economy and CO2 emissions of a hybrid at a price that the whole world can afford.
Pinnacle aims to commercialize this fuel-sipping engine technology by 2013 and has raised $13.5 million in venture funding from NEA, Bessemer Venture Partners and Infield Capital. Let's hope Pinnacle's so-called game-changing technology lives up to the hype.

[Source: Pinnacle Engines]
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Pinnacle Engines Introduces its Ultra-Efficient Combustion Engine

Top Investors Commit $13.5 Million; Former Cummins Executive Ron Hoge Named Chairman and CEO
San Carlos CA – March 31, 2011

Pinnacle Engines today unveiled plans to commercialize a breakthrough ultra-efficient engine by 2013. The new engine design enables significant reductions in fuel consumption and greenhouse gas emissions without increasing vehicle cost. Pinnacle also announced it has raised $13.5 million in venture funding from NEA, Bessemer Venture Partners and Infield Capital.

Advancing the Internal Combustion Engine
While electrification of the worldwide vehicle fleet presents a promising long-term solution, the costs of wide-scale deployment are high. As a result, the global vehicle fleet in 2050 is expected to rely mostly on the internal combustion engine as its prime mover.

Leveraging years of research and development and more than 500 hours of dynamometer testing, Pinnacle Engines' ultra-efficient engine is based on a four-stroke, spark-ignited (SI), opposed-piston, sleeve-valve architecture. It achieves 30 – 50% better fuel economy in various drive cycle comparisons without the large cost penalty normally associated with dramatic fuel economy improvement. The performance of the Pinnacle Engines design has been independently verified by FEV, Inc., a globally recognized leader in engine development and a Pinnacle Engines development partner.

"Engines that can deliver significant efficiencies within 5 – 10 years are critical as the global demand for vehicles places a strain on both natural resources and the environment," said Rohini Chakravarthy, Pinnacle Board member and a Partner at NEA. "We believe Pinnacle Engines is in a unique position to have a major impact in that timeframe, by delivering exceptional efficiency gains at the lowest possible cost."

The core of Pinnacle's technology resides in its unique engine architecture and its Cleeves Cycle. The Cleeves Cycle operates on the Otto cycle (constant volume combustion) or Diesel cycle (constant pressure combustion) depending on operating conditions. Additional efficiency improvements will be realized through incorporation of variable valve timing, direct injection, turbocharging, and Pinnacle's own low-cost variable compression ratio mechanism. The result is a fundamentally more fuel efficient and scalable engine design, and one that is compatible with most fuels including gasoline, diesel, natural gas, propane and their biofuel replacements (e.g., ethanol).

The patented Pinnacle Engines architecture and the innovative Cleeves Cycle are the culmination of over 100 years of combustion engine design, and forty years of research and innovation by founder and CTO Monty Cleeves – a long-time innovator in multiple fields, and a dedicated student of engine design. "This engine technology provides the fuel economy and CO2 emissions of a hybrid at a price that the whole world can afford," says Cleeves.

Global Opportunity
The company is in the process of commercializing its technology through a joint development and licensing agreement with an Asian vehicle OEM. Production is slated to commence in Q1 2013. Further developments, including plans for expansion into the global automotive market, will be revealed later this year.

"By 2016, more than 200 million combustion engines will be manufactured globally. Pinnacle technology could make them considerably more efficient while dramatically reducing the costs required to achieve those efficiencies," states Ron Hoge, Pinnacle's new Chairman and CEO. "Monty Cleeves' lifelong dream to design a much more efficient internal combustion engine is becoming a reality. The opportunity to be a part of this exciting new engine company with its game-changing technology and capability to scale quickly and affordably was something I couldn't pass up."

Hoge has forty years of business experience with executive leadership roles in eight different companies, from Fortune 500 firms to venture-backed startups. His background includes positions as the president and CEO of Cummins Power Generation (Onan), president and CEO of Magnetek, and president of a $1.5 billion aerospace division of Allied Signal. He has led businesses on three continents through their startup, growth, reorganization and disposition phases. He is also a director at two other energy efficiency startups, Glacier Bay, Inc., and NovaTorque, Inc.

About Pinnacle Engines
Pinnacle Engines is a Silicon Valley-based technology company founded to address the immediate need for a more efficient internal combustion engine. Its founders pioneered the ultra efficient Pinnacle Engines' architecture and its Cleeves Cycle while leveraging traditional low-cost engine materials and manufacturing techniques. Pinnacle's novel engine design addresses the growing need for more efficient internal combustion engines and will have a significant global impact on the transportation sector's fuel consumption and CO2 emissions.

For more information please visit www.pinnacle-engines.com.