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The Intelligence-Active Valve Lift System (i-AVLS) is a valvetrain technology implemented by Subaru in their 2.5 L SOHC naturally aspirated engine to improve emissions, efficiency and performance. Note that AVLS is different from AVCS used on other Subaru engines.
Engines which require a tighter control of temperature, as they are sensitive to "Thermal shock" caused by surges of coolant, may use a "constant inlet temperature" system. In this arrangement the inlet cooling to the engine is controlled by double-valve thermostat which mixes a re-circulating sensing flow with the radiator cooling flow.
The active valve control system (AVCS) is an automobile variable valve timing technology used by Subaru. It varies the timing of the valves by using hydraulic oil pressure to rotate the camshaft, known as "phasing", [1] in order to provide optimal valve timing for engine load conditions. The system is closed loop using the camshaft sensors ...
The EJ20X and EJ20Y engines were equipped with Subaru's ‘Dual Active Valve Control System’ (‘Dual AVCS’) which provided variable intake and exhaust valve timing. The Legacy GT, the EJ20X engine was fitted with a twin-scroll IHI VF38 turbocharger; the EJ20Y engine, however, had a larger twin-scroll Mitsubishi TD04 HLA 19T turbocharger.
The FB has an all new block and head featuring dual overhead cams with intake and exhaust variable valve timing (which Subaru designates as AVCS, standing for Active Valve Control System), and a timing chain that replaced the timing belt. Moving to chain-driven cams is said to allow the valves to be placed at a more narrow angle to each other ...
The FB has an all new block and head featuring dual overhead cams with intake and exhaust variable valve timing (AVCS - Active Valve Control System), and a timing chain that replaced the timing belt. Moving to chain-driven cams allows the valves to be placed at a more narrow angle to each other and shrinks the cylinder bore from 99.5 mm to 94.
A thermotime switch, or TTS, is a sensor used to control the cold start enrichment process in some older fuel injection systems. An extra injector is placed in the inlet manifold designed to feed all of the cylinders, and whilst the other injectors have flow rates controlled by pulse duration, the cold start injector stays on during the initial cold starting procedure.
On the other hand, the title being "overhead valve" implies that it's about a kind of valve, like a ball valve or a needle valve, than an engine type, like a flathead engine or an IOE engine. Further, similar reasoning didn't stop straight-six from being renamed straight-six engine .