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2. Variator (variable valve timing) - Wikipedia

   en.wikipedia.org/wiki/Variator_(variable_valve...

   The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.

3. List of Volkswagen Group petrol engines - Wikipedia

   en.wikipedia.org/wiki/List_of_Volkswagen_Group...

   Bosch CIS continuous single-point fuel injection system, with or without knock control and electronic timing advance multi-point electronic indirect fuel injection with four intake manifold-sited fuel injectors; Magneti Marelli, Bosch Motronic or Digifant electronic injection Total Flex, Gasoline or Ethanol (BR)

4. Variable valve timing - Wikipedia

   en.wikipedia.org/wiki/Variable_valve_timing

   The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are necessary to achieve the desired result in intake and exhaust efficiency . This has been described ...

5. VCDS (software) - Wikipedia

   en.wikipedia.org/wiki/VCDS_(software)

   [3] [5] In the past, these dealership-only tools have prevented owners, and many small independent repair shops from performing some fundamental tasks, such as diagnosing problems, diesel ignition timing, modification of convenience options such as automatic door unlocking, coding a replacement electronic control unit (ECU) or key to the ...

6. Engine tuning - Wikipedia

   en.wikipedia.org/wiki/Engine_tuning

   Vintage engine testing equipment that can test ignition timing, ignition dwell, manifold vacuum and exhaust emissions. Engine tuning is the adjustment or modification of the internal combustion engine or Engine Control Unit (ECU) to yield optimal performance and increase the engine's power output, economy, or durability.

7. 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 ...