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 enginesSOHC 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.[1]
References
^Heidbrink, Scott. . Subaru America. Archived from the original on 24 June 2012. Retrieved 14 January 2013.
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active, valve, lift, system, active, valve, lift, system, stands, intelligence, avls, valvetrain, technology, implemented, subaru, naturally, aspirated, engines, sohc, improve, emissions, efficiency, performance, note, that, avls, different, from, avcs, used, . 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 1 References Edit Heidbrink Scott It s what makes a subaru a subaru i AVLS Subaru America Archived from the original on 24 June 2012 Retrieved 14 January 2013 This article about an automotive technology is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Active valve lift system amp oldid 1087408494, wikipedia, wiki, book, books, library,
