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The most critical modifications to the exhaust manifold resonance effects
Mentioned modified exhaust, our first thought is double the exhaust tail section, or go out to the middle of a large diameter exhaust modification, different brands available in the market for a certain product models are a dime a dozen, in fact, in addition to the exhaust tail section modifications, the engine performance has the most direct impact on the exhaust manifold. We all know that the engine after a work needs to be part of the exhaust gas discharge chamber, for each cylinder in accordance with fixed sort sequentially suction pressure burst row (four-stroke) cycle, the entire exhaust system, the most direct impact on the exhaust efficiency The part is an exhaust manifold. Laser rods

Road and engine exhaust manifold is directly connected, the exhaust gas is discharged after the first channel is through the combustion chamber. Original exhaust manifold is usually a large number of open-cast iron products, rough wall, have a certain resistance to airflow, and because you want to take into account the placement of the engine compartment, so the original will not consider each cylinder exhaust manifold Problems exhaust duct length (except for some high-performance models), different lengths of the manifold of each cylinder lead to different exhaust gas running distance, and therefore will be blocked when gathered together together, conflict with each other to form a block, which The more the more serious phenomenon at high speed.

The conversion of equal length exhaust manifold, the vast majority will use the inner wall of smooth stainless steel, saab 9-3 turbocharger stress and even manufacturers are still manifold base and then angle the site, using a special welding process and try to ease the handling of corners, to borrow This has made to reduce the resistance, the effect of accelerating airflow, as long as the design is to solve the interference problem described above, each of the exhaust manifold pressure is the same as the value of the exhaust pulse harmonization (to help play a resonance effect of the exhaust gas ). Some of the exhaust manifold in the structure will be in front of each cylinder exhaust coming together more than the increase of a set of tubes, 4 2 1 exhaust manifold (each cylinder four-cylinder car is often used as a trachea and then every two and two together as one, two tubes together as this last one), the purpose of this approach is appropriate to increase the exhaust back pressure to keep the low-speed torque to play. Relative modified exhaust tail section, the equal length exhaust manifold designed more effectively improve the power performance.