EXHAUST STROKE: Let us start with the strokes of a 4-stroke Engine i.e. Suction, Compression, Power or expansion and finally exhaust stroke. During the exhaust stroke of the Engine, the piston moves towards the TDC (Top Dead Centre) and drives the Note: Find the lowest flow rate greater than or equal to the engine flow rate at the required silencing level. Exhaust flow rates are based on end-in end-out silencers. Refer to product spec sheets when determining side-in or middle side-in back pressure. Velocity should not exceed 15,000 ft/min regardless of the allowable back pressure donaldson.com Back pressure is a pressure in the opposite direction to the exhaust's flow. The goal of an exhaust is remove spent combustion gases as quickly and efficiently as possible out of the engine cylinders. PDF | Exhaust systems should be carefully designed for different applications. Maximum noise reduction is usually desired to the limit of a certain back pressure which is set by the engine Keywords: exhaust back pressure, valve timing, exhaust pipes, combustion efficiency. INTRODUCTION In the diesel engines, during suction and exhaust stroke there is some power loss. This will reduce the brake thermal efficiency, which change from maximum at full throttle to zero at idling. The pressure in the engine However, he soon changed his mind when any increase in back pressure proved to decrease torque on a properly tuned engine. What increasing the backpressure does do is dramatically quiet the exhaust. One of the engine dyno tests carried out by Kevin was on a modified 351-4V Cleveland V8. Following The engine dimension such as length and diameter of inlet and exhaust pipes, inlet and exhaust valve lift, ..etc are the invariable data added into the program. The variable data depends on the engine running condition such as: 1. Exhaust back pressure. 2. Different LIVC angles. 3. Flame factor and ignition timing. 4. A higher exhaust back pressure leads to increased fuel consumption and a loss of power. The maximum recommended exhaust back pressure is 100 mbar for all engines. If the exhaust back pressure is above the maximum recommended value, this has a negative impact on engine performance. Always check the exhaust back pressure when installation is The back pressure phenomenon is important because it can reduce the operating limits of the engine, increase the fuel consumption, and can lead to exhaust smoke due to incomplete combustion. The essential function of a muffler is to route the exhaust gases from the engine exhaust manifold while reducing the noise and back-pressure. Noise reduction is an emerging concern in the automotive industry, and reduction in back-pressure enhances the fuel economy of the engine. back pressure in the exhaust manifold which is used to drive the exhaust gas through the EGR cooler and EGR valve into the intake manifold. This is also the position for cold ambient warm up. During Engine operation at moderate engine speeds and load, the vanes are commanded partially open. The vanes are set to this intermediate position to back pressure in the exhaust manifold which is used to drive the exhaust gas through the EGR cooler and EGR valve into the intake manifold. This is also the position for cold ambient warm up. During Engine operation at moderate engine speeds and load, the vanes are commanded partially open. The vanes are set to this intermediate position to