Numerical/Experimental Study on Downsized Iranian National Engine (EF7) Performance at Low Engine Speeds

Engine downsizing is a trusted method to reduce fuel consumption and pollution emitted from internal combustion engines. In this method, engine displacement volume reduced while maintaining the same power/torque characteristics. However, there still exist several limitations utilize technology. paper, naturally aspirated type of Iran national (EF7-NA) investigated for possible downsized version. A one-dimensional model equipped with zero-dimensional two-zone sub-model was developed validated via experimental results both natural turbocharged types. Then numerical studies were carried out primary concept, deactivation one cylinder besides using turbocharger. To overcome concept shortages, especially in lower ranges speed, extended. Deployment turbochargers different performance maps valve timing dual CVVT system investigated. The showed that feasible EF7 3-cylinder modified turbocharger timing. maximum difference between base-engine version torque about 7% low speeds.