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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 ...
Variable exhaust valve timing (the LW2 engine only had variable intake valve timing) Specially-developed fuel injectors. New pistons with pentroof-style centre-domes and valve eyelets for a higher compression ratio of 12.2:1 (compared to 10.2:1 for the dual fuel engine). A new fuel rail and a new LPG fuel filter. Applications:
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.
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.
In addition to GM's active fuel management, start-stop system, and variable valve timing, which are already featured on GM's other full-size pickup truck engines, this engine also features GM's Intake Valve Lift Control which has 3 different intake cam profiles that are electromagnetically actuated to provide improved fuel economy and ...
It has four valves per cylinder, utilizes dual-overhead cams design, and features variable valve timing on the exhaust cam, a first for GM inline engines. When introduced, this engine's power was 270 hp (201 kW) at 6,000 rpm and torque was 275 lb⋅ft (373 N⋅m) at 3,600 rpm. 2003 saw a slight bump in power to 275 hp (205 kW), while torque was ...
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