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The I-Active Valve Lift System (i stands for intelligence) or i-AVLS is a valvetrain technology implemented by Subaru in the 2.5L naturally aspirated engines SOHC to improve emissions, efficiency and performance. Note that AVLS is different from AVCS used on other Subaru engines. AVLS improves performance and efficiency by changing which camshaft is operating which of the two intake valves. The camshafts on all AVLS Subaru engines have specially designed lobes for intake valves. They feature two different cam profiles: a low/mid lift profile or a high lift profile. The two intake valves in each cylinder are operated by a rocker arm with its own cam lobe. The cam utilized is selected by the Engine Control Unit (ECU). To select different valve lift modes, oil pressure generated by the engine

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  • The I-Active Valve Lift System (i stands for intelligence) or i-AVLS is a valvetrain technology implemented by Subaru in the 2.5L naturally aspirated engines SOHC to improve emissions, efficiency and performance. Note that AVLS is different from AVCS used on other Subaru engines. AVLS improves performance and efficiency by changing which camshaft is operating which of the two intake valves. The camshafts on all AVLS Subaru engines have specially designed lobes for intake valves. They feature two different cam profiles: a low/mid lift profile or a high lift profile. The two intake valves in each cylinder are operated by a rocker arm with its own cam lobe. The cam utilized is selected by the Engine Control Unit (ECU). To select different valve lift modes, oil pressure generated by the engine moves a pin which locks the two lobes together. At low engine speeds the low/mid lift camshafts increases the speed of air rushing into the engine thereby increasing torque and efficiency. At higher engine speeds the high lift camshafts fully open the intake valves, reducing resistance to incoming air and improving power. AVLS only operates one of the intake valves in each cylinder as the other is always open to promote swirl. (en)
  • L'AVCS o Active Valve Control System è una tecnologia utilizzata da Subaru per variare la fasatura delle valvole a fungo d'aspirazione tramite la pressione idraulica dell'olio, per ruotare l'albero a camme in modo da fornire un ottimale flusso d'aria in entrata e in uscita del motore. Il sistema è a ciclo chiuso e utilizza sensori sull'albero a camme, sull'albero motore, i sensori del flusso d'aria, posizione del comando gas, così come sensori d'ossigeno e/o sensori del rapporto aria-carburante, al fine di calcolare il carico del motore.L'ECU è programmato per funzionare con valvole di controllo che regolano la pressione idraulica in modo da spostare l'albero a camme nella posizione che fa fornire al motore le migliori prestazioni, mentre badano alle norme sulle emissioni. AVCS è usato nella Version 7 e con i motori EJ207, EJ255 e EJ257, la seconda generazione EZ30D (dopo il 2005 per il mercato USA) montati sulla Subaru Outback, Subaru Legacy 3.0R e la B9 Tribeca. Un Dual AVCS utilizza sia il sistema d'aspirazione e scarico per EZ36 per la TriBeCa del 2008.Dual AVCS si trova anche sul Japanese Spec engines. (it)
  • i-AVLS智慧氣門提升系統((英文)i-Active Valve Lift System)通常縮寫成「i-AVLS」,乃是由日本富士重工業研發的可變氣門正時技術,可調整進、排氣閥門的開閉時間,除有助於加強馬力輸出,又可減少廢氣排放,專門使用於該公司的自然進氣式引擎。 (zh)
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  • i-AVLS智慧氣門提升系統((英文)i-Active Valve Lift System)通常縮寫成「i-AVLS」,乃是由日本富士重工業研發的可變氣門正時技術,可調整進、排氣閥門的開閉時間,除有助於加強馬力輸出,又可減少廢氣排放,專門使用於該公司的自然進氣式引擎。 (zh)
  • The I-Active Valve Lift System (i stands for intelligence) or i-AVLS is a valvetrain technology implemented by Subaru in the 2.5L naturally aspirated engines SOHC to improve emissions, efficiency and performance. Note that AVLS is different from AVCS used on other Subaru engines. AVLS improves performance and efficiency by changing which camshaft is operating which of the two intake valves. The camshafts on all AVLS Subaru engines have specially designed lobes for intake valves. They feature two different cam profiles: a low/mid lift profile or a high lift profile. The two intake valves in each cylinder are operated by a rocker arm with its own cam lobe. The cam utilized is selected by the Engine Control Unit (ECU). To select different valve lift modes, oil pressure generated by the engine (en)
  • L'AVCS o Active Valve Control System è una tecnologia utilizzata da Subaru per variare la fasatura delle valvole a fungo d'aspirazione tramite la pressione idraulica dell'olio, per ruotare l'albero a camme in modo da fornire un ottimale flusso d'aria in entrata e in uscita del motore. (it)
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  • Active valve lift system (en)
  • AVCS (it)
  • I-AVLS智慧氣門提升系統 (zh)
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