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Manufacturer-specification timing belts may stretch at high rpm, [citation needed] retarding the cam and therefore the ignition. [12] Stronger aftermarket belts will not stretch and the timing is preserved. [13] When designing the timing belt, a wider belt increases its strength however a narrower belt reduces weight and friction. [14]
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 ...
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 ...
An engine requires large amounts of air when operating at high speeds. However, the intake valves may close before enough air has entered each combustion chamber, reducing performance. On the other hand, if the camshaft keeps the valves open for longer periods of time, as with a racing cam, problems start to occur at the lower engine speeds.
The 2011 model year engines had frequent failures of NOx sensors, resulting in reduced engine power. Ford addressed the issue through the Custom Satisfaction Program 12B33, which replaced faulty sensors and upgraded the emission control strategy. The program expired in April 2013. EGT Sensor on "Ambulance Package" Chassis Cab Trucks.
For improved responsiveness on cold starts, VarioCam Plus raises the amount of lift and retards valve timing. At medium revs with minimal loads, the valve lift is lowered and timing advanced to help minimize fuel consumption and emissions. For maximum power and torque, the lift is raised and the timing is advanced.
The application of intake valve type roller rocker arm, which reduces the friction produced when the camshaft is running. The application of Dual VVT-i system, which adjusts timing on both intake and exhaust camshafts. Improved cylinder head design. Longer intake valve, which improves lower-end torque. [12] Compatible with E20 fuel (Dual VVT-iE ...
The MR20DD is a 2.0 L (1997 cc) engine developed by Nissan with direct injection and twin variable valve timing control. The MR20DD engine is "SU-LEV" certified in Japan, and produces 108 kW (145 hp; 147 PS) at 5600 rpm and 155 lb⋅ft (210 N⋅m) of torque at 4400 rpm in its first permutation, with a 11.2:1 compression ratio. [2]