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  2. Variable camshaft timing - Wikipedia

    en.wikipedia.org/wiki/Variable_camshaft_timing

    For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...

  3. Active Fuel Management - Wikipedia

    en.wikipedia.org/wiki/Active_Fuel_Management

    Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.

  4. VTEC - Wikipedia

    en.wikipedia.org/wiki/VTEC

    The first type is for performance engines like the K20A2 or K20Z3 used in the 2002-2006 RSX Type S or the 2006-2011 Civic Si and the second type is for economy engines like the K20A3 or K24A4 used in the 2002-2005 Civic Si or 2003-2007 Accord. The performance i-VTEC system is basically the same as the DOHC VTEC system of the B16A's. Both intake ...

  5. Multi-Displacement System - Wikipedia

    en.wikipedia.org/wiki/Multi-Displacement_System

    Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2005 on the 5.7 L modern Hemi V8.Like Mercedes-Benz's Active Cylinder Control, General Motors' Active Fuel Management, and Honda's Variable Cylinder Management, it deactivates four of the V8's cylinders when the throttle is closed or at steady speeds.

  6. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    Cylinder head of Honda K20Z3.This engine uses continuously variable timing for the inlet valves. Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions.

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