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PRV Performance has developed a variable-area Venturi for spark ignited engines, whereby airflow is regulated by sonic velocity as the piston approaches the bottom of the intake cycle. Airflow is not controlled before the bottom of the intake cycle, because pressure is recovered in the Venturi discharge. Consequently, the pulsating airflow minimizes pumping losses, resulting in improved volumetric engine efficiency.
The variable-area Venturi features fuel injection directly into the Venturi throat. The low-pressure throat vaporizes and cools the air/fuel mixture. The well-mixed, cooled charge improves engine torque, improves thermal efficiency and minimizes cylinder wall fuel stratification.
The pintle-regulated Venturi (PRV) manifold replaces the conventional manifold and throttle plate. No modifications to internal engine components are required. PRV induction reduces fuel consumption, increases torque, and reduces greenhouse gas emissions -- at no additional cost relative to a conventional manifold system. Consequently, smaller, lighter engines are facilitated with PRV induction, particularly when coupled with a turbo charging system. Independent dynamometer testing has demonstrated a 15 to 20% improvement in torque across the entire throttle range while concurrently delivering substantial fuel economy improvement.
PRV induction is complementary to hybrid technology and will improve the performance of ethanol-fueled engines.
Download the technical overview paper, Venturi Induction for Automotive Fuel Economy and Performance, (pdf file) by clicking here.
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