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2. Variable valve timing - Wikipedia

   en.wikipedia.org/wiki/Variable_valve_timing

   Early variable valve timing systems used discrete (stepped) adjustment. For example, one timing would be used below 3500 rpm and another used above 3500 rpm. More advanced variable valve timing systems offer continuous (infinite) adjustment of the valve timing. Therefore, the timing can be optimized to suit all engine speeds and conditions. [2] [3]

3. VVT-i - Wikipedia

   en.wikipedia.org/wiki/VVT-i

   Cutaway view of Variable Valve Timing with intelligence on a ZR engine in Techniquest Glyndŵr. VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing petrol engine technology manufactured by Toyota Group and used by brands Groupe PSA (Peugeot and Citroen), Toyota, Lexus, Scion, Daihatsu, Subaru, Aston Martin, Pontiac and Lotus Cars.

4. Toyota S engine - Wikipedia

   en.wikipedia.org/wiki/Toyota_S_engine

   The bottom end is shared with the gen 4 3S-GTE aside from higher compression pistons. Casting provisions exist in the heads for Exhaust VVT solenoid, and RWD water gallery is open, behind the alternator mount. Rear oil drain at the back of the head is in a different position. Gen 4 also runs a manual throttle body.

5. 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 ...

6. 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.

7. GM High Value engine - Wikipedia

   en.wikipedia.org/wiki/GM_High_Value_engine

   The High Value engine family from General Motors is a group of cam-in-block or overhead valve V6 engines.These engines feature cast iron blocks and aluminum heads, and use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm (3.90 in) bore required offsetting the bores by 1.5 mm (0.059 in) away from the engine center line.